Updated on 2024/07/13

写真a

 
UEMATSU Kazuyoshi
 
Organization
Headquarters for Health Administration and Environmental Safety Center for Environment and Safety Specially Appointed Associate Professor
Title
Specially Appointed Associate Professor
External link

The Best Research Achievement in Research Career

    • 【Papers】 Development of an open-ended coaxial line probe for measurement of dielectric properties of inorganic materials at high temperature  2006.8

    • 【Papers】 Synthesis and luminescence properties of non-doped long persistent phosphors : Mg2SnO4  2010

Degree

  • 博士(工学) ( 2007.9   新潟大学 )

Research History

  • Niigata University   Center for Environment and Safety, Headquarters for Health Administration   Specially Appointed Associate Professor

    2022.10

  • Niigata University   Office for Environment and Safety, Headquarters for Health Administration   Specially Appointed Associate Professor

    2022.4 - 2022.9

  • Niigata University   Graduate School of Science and Technology   Specially Appointed Assistant Professor

    2016.4 - 2018.8

Qualification acquired

  • Chief Person of Radiation Handling (first and second kind)

  • Health Supervisor (first kind)

  • Hygiene Engineering Hygiene Manager

  • Hazardous Material Handler (first kind)

 

Papers

  • One-pot synthesis of single phase Eu2+-activated MSi2O2N2 (M = Sr, Ba) by Controlling precursors and oxygen/nitrogen ratio

    Masato Iwaki, Ryo Tanaka, Kazuyoshi Uematsu, Mineo Sato, Kenji Toda

    Journal of Luminescence   119714 - 119714   2023.1

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jlumin.2023.119714

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  • Near ultraviolet light excitable highly efficient blue-green multicolour warwickite phosphor, ScCaO(BO<sub>3</sub>):Ce<sup>3+</sup>, Tb<sup>3+</sup>

    Masato Iwaki, Haruto Sato, Mizuki Watanabe, Kazuyoshi Uematsu, Mineo Sato, Kenji Toda

    Materials Advances   4 ( 6 )   1546 - 1554   2023

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    Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    Ce<sup>3+</sup>, Tb<sup>3+</sup> co-doped multicolour emission phosphors show highly efficient green emission by energy transfer from Ce<sup>3+</sup> to Tb<sup>3+</sup>.

    DOI: 10.1039/d2ma01065h

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  • Near Ultraviolet Excitable Cyan-Green Phosphors of Ba6La2Al3ScO15:Ce3+ and Ba6La2Al3ScO15:Ce3+,Tb3+: Investigations on Crystal Structure, Site Assignment of Ce3+ and Tb3+ Ions, and Energy Transfer Process from Ce3+ to Tb3+

    Masato Iwaki, Mizuho Onodera, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Dalton Transactions   2023

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    Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    An energy transfer from Ce3+ to Tb3+ is feasible in energy transition processes for development of optical devices, especially phosphor-converted white LEDs (pc-wLEDs). Most of energy transfer phosphors co-doped with...

    DOI: 10.1039/d3dt00383c

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  • Novel green-emitting copper-doped Cs2ZnCl4 synthesized via low-temperature solid-state reaction using a small amount of water

    Mizuki Watanabe, Honoka Takahashi, Kazuyoshi Uematsu, Mineo Sato, Takaki Masaki, Dae-Ho Yoon, Kenji Toda

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   130 ( 7 )   458 - 463   2022.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    All-inorganic halides exhibit excellent optical as well as luminescence properties. Among them, non-toxic copperdoped halide Cs2ZnCl4 with high stability is a promising material. However, the conventional method for preparing these materials, using the hot injection technique, is unsuitable for mass production. Therefore, herein, we suggest a simple and low-temperature (below 100 degrees C) method without using special equipment, regents, and treatments. Cu-doped Cs2ZnCl4 was successfully synthesized using the water-assisted solid-state reaction (WASSR) method, and the oxidation state of Cu in the samples was estimated through the iodometric titration technique. The optical and luminescence properties were investigated using the absorption and photoluminescence excitation/emission spectra. Significantly, Cu-doped Cs2ZnCl4 exhibited unique green emission centered at 3520 nm under ultraviolet irradiation. Moreover, the oxidation of Cu in the Cs2ZnCl4 lattice was suppressed owing to the low-temperature conditions in the WASSR. (c) 2022 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.21193

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  • Emission color shift from green yellow to reddish orange in Eu2+-activated Ca6BaP4O17 by doping high amount of activator ion

    Masato Iwaki, Honoka Takahashi, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    JOURNAL OF LUMINESCENCE   246   2022.6

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    The most common white-light emitting diodes (wLEDs), which consist of a blue LED (InGaN) and a yellowemitting Y3Al5O12:Ce3+ (YAG:Ce3+) phosphor, exhibit cool-white light due to the weak red emission of the phosphor. Thus, development of red-emissive phosphors that can be excited by blue light irradiation is critically important to improve the color reproducibility of the current wLEDs. In this study, we successfully obtained color-tunable Ca6(1-x)Eu6xBaP4O17 (x = 0.01-0.20) phosphors via the conventional solid state reaction. The emission color of Eu2+-activated Ca6BaP4O17 phosphors can be varied from green yellow to reddish orange by adjusting the amount of Eu2+ ions in the host lattice. As determined by Rietveld refinement, Eu2+ ions preferentially occupy two different crystallographic calcium sites, CaO7 and CaO8. Prototype wLEDs were fabricated and the optical properties of Eu2+-activated Ca6BaP4O17 phosphors, including photoluminescence, were systematically evaluated. Other properties such as lifetime and thermal stability were also studied.

    DOI: 10.1016/j.jlumin.2022.118810

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  • Porous Lanthanide Metal-Organic Frameworks Using Pyridine-2,4-dicarboxylic Acid as a Linker: Structure, Gas Adsorption, and Luminescence Studies International journal

    Mineo Sato, Tadashi Ishigaki, Masato Iwaki, Kazuyoshi Uematsu, Mizuki Watanabe, Kenji Toda

    INORGANIC CHEMISTRY   60 ( 23 )   17810 - 17823   2021.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Two types of new lanthanide coordination networks, [Ln3(pdc)4(Hpdc)(H2O)3]·8H2O [H2pdc = pyridine-2,4-dicarboxylic acid; Ln = Ce (1), Pr (2), Sm (3), Eu (4); type A) and [Tb5(pdc)4(Hpdc)]·3H2O (type B), have been synthesized using a hydrothermal synthetic method. The former type A compound has an unfamiliar architecture, even basically comprised of primitive cubic (pcu) topology, and demonstrate porous gas adsorption behavior, giving several hundreds of square meters per gram surface areas after evacuation of the water molecules, while the latter type B compound does not show any porous properties. Most interestingly, the solvothermal synthetic method using N,N-dimethylformamide (DMF) as a solvent gives compounds that crystallize in a structure analogous to that of type A for Ln = La-Ho, probably formulated as [Ln3(pdc)4(Hpdc)·(DMF)m]·nDMF. These compounds also exhibit large surface areas after evacuation of the DMF molecules and also moderate amounts of hydrogen gas uptake at 77 K. The luminescence properties were investigated for Eu and Tb analogues at elevated temperatures, at which an unusual increase in the emission intensity was observed upon the release of solvents, and discussed based on their porous structure.

    DOI: 10.1021/acs.inorgchem.1c02431

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  • Synthesis of Red-Emissive CaV2O6 Nanophoshor via a Water Assisted Solid State Reaction Method

    Mizuki Watanabe, Masaru Muto, Yusuke Abe, Tatsuro Kaneko, Ayano Toda, Kazuyoshi Uematsu, Tadashi Ishigaki, Mineo Sato, Junko Koide, Masako Toda, Yoshiaki Kudo, Takaki Masaki, Dae-Ho Yoon, Sun-Woog Kim, Kenji Toda

    ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY   10 ( 10 )   2021.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELECTROCHEMICAL SOC INC  

    Monoclinic CaV2O6 (under 100 nm in diameter) phosphor was obtained via a water-assisted solid-state reaction (WASSR) method at 80 degrees C-120 degrees C and exhibited red emission at room temperature. The estimated average particle size, ratio of the V5+ ion (the emission center) in the structure, and optical properties were investigated through scanning electron microscopy, X-ray photoelectron spectroscopy, electron spin resonance spectroscopy, UV-vis spectroscopy, and fluorophotometric analysis. The average size of the particles obtained using the WASSR method was less than 100 nm. Compared with CaV2O6 obtained using the conventional solid-state reaction method, the amount of V5+ in CaV2O6 was 16% higher and the emission intensity was 1.4-fold higher by using the WASSR method.

    DOI: 10.1149/2162-8777/ac2e4c

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  • Afterglow improvement of high concentration Dy3+ co-doped SrAl2O4:Eu2+ phosphor prepared by H3BO3 free synthesis using melt quenching method

    Ryo Tanaka, Kazuyoshi Uematsu, Mineo Sato, Kenji Toda

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   129 ( 7 )   372 - 376   2021.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Melt quenching method was applied to prepare the long persistent phosphor SrAl2O4:Eu2+,Dy3+, and Dy(3+)concentration dependence of afterglow property was investigated. Melt quenched SrAl2O4:Eu2+,Dy3+ phosphors exhibit brighter afterglow intensity compared with these synthesized by a conventional solid-state reaction method. The afterglow property was improved with increase of Dy3+ concentration, and 10 mol% Dy3+ co-doped sample exhibits approximately 1.3 times higher afterglow intensity than commercially available phosphor. (C) 2021 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.20235

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  • IR study on adsorption of carbon dioxide on alkaline earth metal ion-exchanged titanate nanotubes at room temperature

    Eri Uematsu, Atsushi Itadani, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    VIBRATIONAL SPECTROSCOPY   109   2020.7

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    We investigated the adsorption of carbon dioxide (CO2) at room temperature on alkaline earth metal ion-exchanged titanate nanotubes using Fourier transform infrared (FT-IR) spectroscopy and volumetric adsorption. CO2 adsorption capabilities were found to increase with increase in the ionic radius of the alkaline earth metal ions exchanged. Alkaline earth metal ion-exchanged titanate nanotubes exhibited the characteristic IR bands responsible for the nu(3) asymmetric stretching vibration of a CO2 molecule depending on the ionic radius of the alkaline earth metal ions exchanged. From the relationship between the shifted value from the free CO2 gas for the observed frequency and electrostatic field, we concluded that electrostatic forces are dominant driving forces for the interaction between CO2 and the alkaline earth metal ion-exchanged titanate nanotubes.

    DOI: 10.1016/j.vibspec.2020.103088

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  • IR spectroscopic detection of the propene species formed via the interaction of copper-ion-exchanged MFI-type zeolite with propane at 573 K

    Kaori Horiguchi, Atsushi Itadani, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    VIBRATIONAL SPECTROSCOPY   106   2020.1

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    Copper-ion-exchanged MFI-type zeolite (CuMFI) has been reported to effectively interact with propane (C3H8) even at room temperature and this sample has the potential of being used as a CH- bond activation material. In this study, we examined the interaction between CuMFI and C3H8 at various temperatures. The adsorption isotherms of C3H8 showed that CuMFI exhibits strong adsorption at 573 K. For CuMFI treated at temperatures above 573 K under a C3H8 atmosphere, a characteristic infrared (IR) absorption band was detected at 1542 cm(-1), which was hardly observed for other samples such as NaMFI and HMFI. This band was assigned to the CC stretching vibration mode of propene (C3H6) species adsorbed on CuMFI. Therefore, the C3H6 species were produced by the contact of CuMFI with C3H8 at approximately 573 K; propane dehydrogenation occurred. This temperature (573 K) was lower than the reaction temperature for propane dehydrogenation, which had been reported to be temperature around 773 K or higher.

    DOI: 10.1016/j.vibspec.2019.103016

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  • Improved luminescence properties of Na2TiSiO5 phosphor by the Ge4+ doping in the crystal lattice

    Young Ji Park, Sun Woog Kim, Kazuma Sugimoto, Takuya Hasegawa, Koudai Tanima, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    JOURNAL OF CERAMIC PROCESSING RESEARCH   20 ( 5 )   460 - 463   2019.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:KOREAN ASSOC CRYSTAL GROWTH, INC  

    Rare earth free white emitting Na2TiSi1-xGexO5 phosphors were synthesized by a conventional solid-state reaction method, and the photoluminescence properties were characterized. The phosphors obtained in the present study showed broad bluish-white emission with a peak at 485 nm due to the charge transfer transition between O2- and Ti4+ and the emission peak intensity was effectively enhanced by the Ge4+ doping in the Na2TiSiO5 crystal lattice. The emission peak intensity of Na2TiSi0.5Ge0.5O5 was 1.35 times higher than that of Na2TiSiO5 and the CIE chromaticity coordinate values for the phosphor were x = 0.29 and y = 0.38.

    DOI: 10.36410/jcpr.2019.20.5.460

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  • Specific interaction of the bacterial iron oxide microtubes with methyl red

    Yoshihide Takayama, Atsushi Itadani, Hideki Hashimoto, Kazuyoshi Uematsu, Kenji Toda, Jun Takada, Mineo Sato

    MATERIALS LETTERS   252   146 - 149   2019.10

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    Biogenous iron oxide microtubes (L-BIOX) are interesting substances that exhibit high potential for application as a practical material. However, the nature of the L-BIOX surface, which is the working site for various phenomena, has not yet been completely clarified. We conducted experiments to elucidate the surface properties of L-BIOX, which interacted with methyl red at room temperature in the dark, depending on its calcination temperature. (C) 2019 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.matlet.2019.05.130

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  • Luminescence enhancement of LiSrPO<inf>4</inf>:Eu<sup>2+</sup> phosphor by Mg<sup>2+</sup> ion addition Reviewed

    Shinnosuke Kamei, Tomoki Hatsumori, Takuya Hasegawa, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Materials Research Innovations   23 ( 6 )   359 - 362   2019.9

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    © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group. Mg-doped LiSrPO4:Eu2+ (Li(Sr, Mg)PO4:Eu2+) phosphors, in which some Sr2+ ions were replaced by Mg2+ ions, were prepared using a conventional solid-state reaction method. The crystal structure of the phosphors was hexagonal, which is the high-temperature phase of LiSrPO4, even though synthesis was carried out at a relatively low temperature of 900 °C. Fluorescence could be efficiently excited in the 220–400 nm ultraviolet region, and bright blue emission was produced with a peak at 448 nm. The emission intensity was higher than that for LiSrPO4:Eu2+ without Mg doping, and a lower Eu content (1 mol%) was required in order to reach the maximum intensity. These results indicate that the blue-emitting Li(Sr, Mg)PO4:Eu2+ phosphor is a promising candidate for phosphor-conversion white Light Emitting Diodes.

    DOI: 10.1080/14328917.2018.1482650

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  • Blue-light-pumped wide-band red emission in a new Ce3+-activated oxide phosphor, BaCa2Y6O12:Ce3+: Melt synthesis and photoluminescence study based on crystallographic analyses

    Takuya Hasegawa, Masato Iwaki, Sun Woog Kim, Tadaharu Ueda, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    JOURNAL OF ALLOYS AND COMPOUNDS   797   1181 - 1189   2019.8

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    Based on a proposed new materials design concept, we succeeded in discovering a new red-emitting oxide phosphor, BaCa2Y6O12:Ce3+, via a melt synthesis technique using an arc-imaging furnace. Rietveld refinement using X-ray diffraction data gave the crystal structure of the obtained phosphor, which has the same framework as the reported host lattice, hexagonal BaCa2Y6O12. However, the structure between the Ba and Ca atoms was partially disordered, and the site symmetry for the Ba site decreased from the 2a and 2b Wyckoff positions to 4e. The phosphor shows a reddish-yellow colour emission with a broad-band spectrum under blue-light irradiation at 460 nm. The emission spectrum was composed of four Gaussian bands, indicating Ce3+ is incorporated into two different sites, Ca2+-dominant and Y3+ sites, and this could be estimated using an empirical equation for determining the emission wavelength from crystallographic data and chemical compositions. Additionally, based on the observation of the particle morphology, the measurement of Ce3+ concentration and the thermal dependence of the luminescence intensity and luminescence lifetime property, BaCa2Y6O12:Ce3+ has high potential as a fundamental material. Crystal-field analysis based on the refinement of the crystal structure revealed the luminescence mechanism. The present work includes unique results on a distinct material design concept for a red-emitting oxide phosphor, which should have great significance for future phosphor material development. (C) 2019 Published by Elsevier B.V.

    DOI: 10.1016/j.jallcom.2019.05.155

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  • Room temperature adsorption of propene and propane on copper ions distributed in titanate nanotubes

    Yu Kanazawa, Atsushi Itadani, Hideki Hashimoto, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    APPLIED SURFACE SCIENCE   483   642 - 651   2019.7

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    Titanate nanotubes containing copper ions are interesting materials that exhibit efficient activity in the selective reduction of nitrogen monoxide and/or in the degradation of dyes. However, research seems to be less concerned about the interaction of these materials with various gas molecules. We investigated the room temperature adsorption of propene and propane onto the copper ion distributed on the titanate nanotubes (Cu2+-T-TiO2). From the adsorption experiments utilizing carbon monoxide, it was apparent that monovalent copper ions are formed in the titanate nanotubes by evacuation at around 473 K. Cu2+-T-TiO2 exhibited more efficient adsorption for propene, in comparison with propane. Fourier transform infrared spectroscopy clearly indicated the interaction of the monovalent copper ions in the titanate nanotubes with propene due to the pi back donation interaction between the active centers in the nanotubes and propene.

    DOI: 10.1016/j.apsusc.2019.03.328

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  • Single Crystal Growth and Crystal Structure Analysis of Novel Orange-Red Emission Pure Nitride CaAl2Si4N8:Eu2+ Phosphor. International journal

    Shota Hasegawa, Takuya Hasegawa, Sun Woog Kim, Ryota Yamanashi, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    ACS omega   4 ( 6 )   9939 - 9945   2019.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Single crystal of novel orange-red emission CaAl2Si4N8:Eu2+ phosphor was grown by our original vapor phase technique, and the precise crystal structure was investigated for the first time by single crystal X-ray diffraction analysis. The crystal structure of CaAl2Si4N8:Eu2+ single crystal was verified to be an α-Si3N4-type trigonal structure (space group P31c) with a = 0.79525(9) nm, c = 0.57712(8) nm, and z = 2. The Ca atoms were coordinated to seven nitrogen atoms and located in the three-dimensional framework formed by (Al, Si)N4 tetrahedra. The single-crystal CaAl2Si4N8:Eu2+ phosphors exhibited a broad reddish-yellow emission with a peak at 600 nm under near-UV and blue light excitation. When increasing the temperature up to 150 °C, the emission intensity of the CaAl2Si4N8:Eu2+ phosphor decreased to 88% of the initial value at 25 °C.

    DOI: 10.1021/acsomega.9b00606

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  • Mild condition synthesis without high temperature process of Eu2+-doped barium orthosilicate nanophosphor via Water-Assisted Solid-State Reaction (WASSR) method

    Yusuke Shibuta, Takuya Hasegawa, Sun-Woog Kim, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    JOURNAL OF ALLOYS AND COMPOUNDS   788   1009 - 1012   2019.6

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    A green-emissive Ba2SiO4: Eu2+ nanophosphor has been succeeded to practically synthesize at the lowest temperature of 220 degrees C by a Water-Assisted Solid-State Reaction (WASSR) method, which has been developed by our group. The Ba2SiO4 was prepared with employing various barium and silicon sources, and the reaction proceeded only in the combination of Ba(OH)(2).8H(2)O and amorphous SiO2. In addition, the results of X-ray powder diffraction gave evidence that the Ba2SiO4 phase was formed through a Ba-2[SiO2(OH)(2)](2) phase as an intermediate in this synthetic method. The obtained primary particle size was found to be 15-20 nm because of employing mild condition without high temperature process. Additionally, the nanophosphors exhibited a green emission attributed to 4f(6)5d(1) -> 4f(7) transition of Eu2+ under the near UV excitation of 360 nm. The result indicates that Eu3+ is partly reduced to Eu2+ without using reduction gas. (C) 2019 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2019.02.295

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  • High thermal stable blue-emitting alkali silicate phosphor, Eu2+-activated Na2Mg2Si6O15

    Masato Iwaki, Kazuma Sugimoto, Masaru Watanabe, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    JOURNAL OF CERAMIC PROCESSING RESEARCH   20 ( 3 )   205 - 210   2019.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:KOREAN ASSOC CRYSTAL GROWTH, INC  

    White LEDs based on near ultraviolet LED and red/green/blue phosphors have been attracted in terms of outstanding color rendering index. In particular, we focus on the blue emitting phosphors because the commercial BaMgAl10O17:Eu2+ needs high temperature in order to be obtained. In this study, we succeeded in synthesizing Eu2+-activated Na2Mg2Si6O15 phosphors as a single phase by the conventional solid state reaction. Eu2+-doped Na2Mg2Si6O15 phosphors showed the broad blue emission from 400-550 nm due to the 4f-5d allowed transition of Eu2+ under the ultraviolet light excitation. Moreover, the emission intensity of Eu2+-activated Na2Mg2Si6O15 phosphor at high temperature kept about 85% at 423 K, which indicated the thermal stability of Na2Mg2Si6O15:Eu2+ was extremely higher than that of other Eu2+-activated silicate phosphors. Thus, Eu2+-activated Na2Mg2Si6O15 phosphor is able to become the novel luminescent material for White LED based on the near-ultraviolet LED.

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  • Single crystal growth of nitride and oxynitride phosphors using a gas-solid phase hybrid synthesis method

    Yuya Higuchi, Masato Iwaki, Atsuya Koizumi, Ryota Yamanashi, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    JAPANESE JOURNAL OF APPLIED PHYSICS   58   2019.6

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    The Al doped Sr2Si5N8:Eu2+ single crystal Sr2AlxSi5-xOxN8-x:Eu2+ (x approximate to 0.7) were grown by our original single crystal growth method and the precise crystal structure was investigated by single crystal X-ray diffraction analysis for the first time. O atoms are partially substituted for only N1 and N5 sites which are connected with the Si/Al atoms to compensate the "Pauling's second rule", which indicates the introduction of Al atoms for Si sites restricts the N sites that can be substituted by O atoms. The Sr2AlxSi5-xOxN8-x:Eu2+ (x approximate to 0.7) phosphors show the change of site selectivity of Eu for Sr sites, which causes the red-shifted emission spectrum of Sr2AlxSi5-xOxN8-x:Eu2+ (x approximate to 0.7) than that of Sr2Si5N8:Eu2+. (C) 2019 The Japan Society of Applied Physics

    DOI: 10.7567/1347-4065/ab0c74

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  • Novel green Sr4ScAl3O10:Eu2+ phosphor prepared by the Melt Quenching Technique

    Kenji Toda, Masato Iwaki, Minenori Katsu, Shin-nosuke Kamei, Sun-Woog Kim, Takuya Hasegawa, Masaru Muto, Ryota Yamanashi, Tatsuya Sakamoto, Tadashi Ishigaki, Kazuyoshi Uematsu, Mineo Sato, Dae-Ho Yoon

    JOURNAL OF CERAMIC PROCESSING RESEARCH   20 ( 3 )   276 - 279   2019.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:KOREAN ASSOC CRYSTAL GROWTH, INC  

    New green-emitting Sr4ScAl3O10:Eu2+ phosphor was prepared using a novel melt quenching synthesis method. The temperature of raw materials irradiated with the strong light of the Xe arc-lamp was rose up to about 2273 K, followed by a sharp drop in the temperature after turn off the lamp. This method is a useful tool for rapid screening of novel phosphor materials.

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  • Tubular Titanates: Alkali-Metal Ion-Exchange Features and Carbon Dioxide Adsorption at Room Temperature

    Eri Uematsu, Atsushi Itadani, Hideki Hashimoto, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH   58 ( 13 )   5168 - 5174   2019.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Tubular titanates (T-TiO2) are interesting materials considering their large specific surface area and ability for cationic substitution in the tubes. In this study, we systematically examined the alkali-metal ion-exchange features of T-TiO2 and clarified their CO2 adsorption properties at room temperature in details. Assuming the resulting ion exchange was affected by hydration, T-TiO2 ion-exchange samples exhibited more intense exchange levels with an increasing alkali-metal ionic radius. Furthermore, the alkali metal ions exchanged were confirmed from the EDS maps to be uniformly distributed in the samples. CO2 adsorption capabilities were found to decrease with increasing the ionic radius of the alkali-metal ions exchanged. We rationalized the electrostatic forces between CO2 and the alkali-metal ion-exchanged titanate nanotubes as the dominant driving force.

    DOI: 10.1021/acs.iecr.8b05662

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  • Blue-yellow multicolor phosphor, Eu2+-activated Li3NaSiO4: Excellent thermal stability and quenching mechanism

    Masato Iwaki, Shota Kumagai, Shoma Konishi, Atsuya Koizumi, Takuya Hasegawa, Kazuyoshi Uematsu, Atsushi Itadani, Kenji Toda, Mineo Sato

    JOURNAL OF ALLOYS AND COMPOUNDS   776   1016 - 1024   2019.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE SA  

    A multicolor emission phosphor can become a new luminescent material for emitting devices such as LEDs. However, most multicolor emission phosphors require two or more luminescent ions, such as Eu2+/Mn2+ and Eu2+/Tb3+/Mn2+. In this study, novel multicolor phosphor materials Li3NaSiO4:Eu2+ were successfully synthesized using a conventional solid-state reaction. The phosphors showed a unique white color with multicolored blue and yellow emissions under a near-ultraviolet light at 360 nm. Based on this result, there seems to be strong evidence that Eu2+ ions are substituted for two cation sites, NaO(6 )and LiO5. Moreover, Eu2+-doped Li3NaSiO4 phosphors exhibit excellent thermal stability in comparison with Eu2+-activated silicate phosphors owing to the presence of electron traps, which can be activated at high temperatures. (C) 2018 Published by Elsevier B.V.

    DOI: 10.1016/j.jallcom.2018.10.299

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  • Synthesis of Na2FePO4F using polytetrafluoroethylene

    Atsushi Tsu-Ura, Hirotaka Torii, Takuya Hasegawa, Dai Murayama, Sun Woog Kim, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   126 ( 5 )   336 - 340   2018.5

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    Polytetrafluoroethylene (PTFE), composed of fluorine and carbon atoms, has a potential to produce carbon-coated fluorides in the calcination of inorganic compounds. We synthesized high voltage cathode material for Na ion secondary battery, Na2FePO4F, using PTFE as the carbon-coating and fluorine source. The Na2FePO4F carbon-coated by a thermal decomposition of PTFE showed high discharge capacity (64.4 mAh g(-1)) at the first cycle of galvanostatic cycling by the improvement of conductivity. (C) 2018 The Ceramic Society of Japan. All rights reserved.

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  • Paradigm Change for Solid State Reactions: Synthesis of Lithium Orthophosphate Li3PO4 Nanoparticles by a Water Assisted Solid State Reaction (WASSR) Method

    Sun Woog Kim, Kenji Toda, Takuya Hasegawa, Mizuki Watanabe, Tatsuro Kaneko, Ayano Toda, Atsushi Itadani, Mineo Sato, Kazuyoshi Uematsu, Tadashi Ishigaki, Junko Koide, Masako Toda, Yoshiaki Kudo, Takaki Masaki, Dae Ho Yoon

    SCIENCE OF ADVANCED MATERIALS   10 ( 4 )   592 - 596   2018.4

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    Lithium orthophosphate Li3PO4 nanoparticles were synthesized through a water assisted solid state reaction (WASSR) method. The nanoparticles obtained in this study adopt a stable orthorhombic structure (beta-type), which is a low temperature phase, in a single phase with high crystallinity. The Li3PO4 nanoparticles have a granular particle morphology and the particle size is less than 50 nm.

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  • Room-Temperature Solid State Contact Reaction Synthesis of Rare Earth Free RbVO3 Phosphor and Their Photoluminescence Properties

    Tadashi Ishigaki, Puttaswamy Madhusudan, Shinnosuke Kamei, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY   7 ( 6 )   R88 - R93   2018

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    Rare earth free RbVO3 ceramic materials were prepared by facile solid-solid contact reaction between Rb2CO3 and V2O5 powders at room temperature within few minutes. Synchrotron X-ray power diffraction analysis and energy dispersive X-ray spectroscopy study showed that the resultant nanoparticles are crystalline with almost 100% purity. Further, the as-prepared sample showed emission spectrum intensity at 530 nm implying that RbVO3 ceramic materials can be used for white LED application. In addition, when 0.01 M aqueous NH4OH was added to the mixture of Rb2CO3 and V2O5, the emission intensity of the product was about twice higher than that of the product obtained from the reaction in moist air. The luminescence internal quantum efficiency (QE) of as-prepared RbVO3 phosphor is about 35% as estimated by a direct method. The present room-temperature fabrication method has great potential in large-scale fabrication of phosphor materials as well as other composite functional materials due to significantly reduced reaction time and energy. (C) 2018 The Electrochemical Society.

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  • Nanophosphors synthesized by the water-assisted solid-state reaction (WASSR) method: Luminescence properties and reaction mechanism of the WASSR method

    Sun Woog Kim, Takuya Hasegawa, Mizuki Watanabe, Masaru Muto, Toshiya Terashima, Yusuke Abe, Tatsuro Kaneko, Ayano Toda, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato, Emiko Kawakami, Junko Koide, Masako Toda, Yoshiaki Kudo, Takaki Masaki, Dae Ho Yoon

    APPLIED SPECTROSCOPY REVIEWS   53 ( 2-4 )   177 - 194   2018

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    Ceramic materials have been widely used in various applications and are significantly important in our daily life. The various methods for synthesizing ceramics powder materials have been already reported, and the synthesis method is known to considerably affect the characteristics and particle morphology of ceramic powder materials. We have recently developed a novel soft chemical synthesis method, named water-assisted solid-state reaction (WASSR) method, which can be synthesized at low temperatures below 100 degrees C. We further demonstrated the effect and availability of this method on the synthesis process for ceramic oxide materials. In this paper, we review some results for the nanophosphors synthesized by the WASSR method and discuss the reaction mechanism of this method.

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  • Synthesis of nano-sized materials using novel water assisted solid state reaction method Reviewed

    Kenji Toda, Tatsuro Kaneko, Takuya Hasegawa, Mizuki Watanabe, Yusuke Abe, Takeshi Kuroi, Mineo Sato, Kazuyoshi Uematsu, Sun Woog Kim, Yoshiaki Kudo, Takaki Masaki, Dae Ho Yoon

    Key Engineering Materials   777 KEM   163 - 167   2018

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    © 2018 Trans Tech Publications, Switzerland. We report synthesis of nano-sized oxide materials using a novel water assisted solid state reaction (WASSR) method. This novel soft chemical synthesis method is very simple and can synthesize nanoparticle materials just by storing or mixing raw materials added a small amount (typically 10wt%) of water in a reactor at low temperature below 373 K. Combinations of raw materials have a significant influence on the reaction rate.

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  • Yellow MgV2O6 center dot 2H(2)O nanophosphor synthesized by a water-assisted solid-state reaction (WASSR) method at low temperature below 80 degrees C

    Sun Woog Kim, Yusuke Abe, Mizuki Watanabe, Takuya Hasegawa, Masaru Muto, Ayano Toda, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato, Emiko Kawakami, Junko Koide, Masako Toda, Yoshiaki Kudo, Toshiyuki Masui, Takaki Masaki, Dae Ho Yoon

    DYES AND PIGMENTS   145   339 - 344   2017.10

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    Magnesium metavanadate dihydrate (MgV2O6.2H(2)O) was synthesized as a nanophosphor by a water assisted solid-state reaction (WASSR) method, and its crystal structure and luminescence properties were investigated in detail. MgV2O6.2H(2)O has an orthorhombic structure with space group Pnma. In the crystal structure, the MgO6 octahedra and VO4 tetrahedra formed a layered structure in the direction of the b axis, and the VO4 tetrahedra formed a chain structure along the a axis. The nanophosphor showed broad and strong optical absorption in the near-ultraviolet region and exhibited a broad yellow emission peak at 563 nm. (C) 2017 Elsevier Ltd. All rights reserved.

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  • Improvement in Electrochemical Performance of LiCoPO4/C Using Furnace Blacks with High Surface Areas as a Carbon-based Composite Material

    Shoma Konishi, Dai Murayama, Atsushi Itadani, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato, Nozomi Arimitsu, Takayuki Aoki, Togo Yamaguchi

    ELECTROCHEMISTRY   85 ( 10 )   643 - 646   2017.10

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    LiCoPO4-carbon composites (LiCoPO4/C) were synthesized via a solid state reaction with a new furnace black, CB1, which was developed by Asahi Carbon Co., Ltd. The CB1 used here has superiority physico-chemical properties, e.g., ultrafine particle sizes, high specific surface areas, and high "structure", the degree of linkage among carbon particles. The particle growth of LiCoPO4 was suppressed by the addition of CB1 to the LiCoPO4 precursors and then followed by calcination. CB1 was dispersed among LiCoPO4/C particles successfully to form conductive paths. Consequently, a high electrochemical capacity was achieved in aid of the presence of CB1. (C) The Electrochemical Society of Japan, All rights reserved.

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  • Unusual, broad red emission of novel Ce3+ -activated Sr3Sc4O9 phosphors under visible-light excitation

    Takuya Hasegawa, Sun Woog Kim, Tadaharu Ueda, Tadashi Ishigaki, Kazuyoshi Uematsu, Hiromitsu Takaba, Kenji Toda, Mineo Sato

    JOURNAL OF MATERIALS CHEMISTRY C   5 ( 36 )   9472 - 9478   2017.9

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    Most conventional white light emitting diodes (white-LEDs) that are widely used as a new lighting system in next generation lights with Y3Al5O12: Ce3+ (YAG: Ce3+)-based phosphors have a low colour rendering index (CRI) because the YAG: Ce3+ phosphor shows a weak emission intensity in the red spectral region. Therefore, discovering a red-emitting phosphor with a high-efficiency is quite important to enhance the CRI of white-LEDs. In this study, we successfully discovered a novel, red-emitting Ce3+-activated Sr3Sc4O9 phosphor that can be excited by blue-light irradiation at 425 nm. A crystal structure of the host material was first determined by Rietveld refinement, which indicated that it should be isostructural with Ba(3)Ln(4)O(9) (Ln = Sc, Y and Dy-Lu). As the Ce3+ content increased, the X-ray diffraction patterns shifted to a lower angle, which suggested that the Ce3+ ion could substitute Sc in the Sr3Sc4O9 host. Under UV and blue-light excitation, the Ce3+-activated Sr3Sc4O9 phosphor exhibited a broad emission band with a maximum peak at 620 nm, and its full width half maximum (FWHM) was 180 nm (4530 cm(-1)). The highest emission intensity was obtained for Sr-3(Sc0.997Ce0.003)(4)O-9, and the internal quantum efficiency of this phosphor under excitation at 425 nm was 53%. To the best of our knowledge, the emission band of the Ce3+-activated Sr3Sc4O9 phosphor is the longest wavelength for a reported Ce3+-activated oxide phosphor.

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  • On the possibility of polystyrene-derived carbon coating for NASICON-type Na3V2(PO4)(3) composites as cathode materials for sodium-ion batteries

    Dai Okada, Takumi Fugane, Yuka Matsumoto, Takuya Hasegawa, Atsushi Itadani, Kazuyoshi Uematsu, Kenji Toda, Hideki Hashimoto, Jun Takada, Mineo Sato

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   125 ( 4 )   322 - 325   2017.4

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    We here prepared polystyrene-derived carbon-coated Na3V2(PO4)(3) composite (NVP/C) cathode materials via a solid-phase reaction using a mixture of NVP precursor and polystyrene (as the carbon source), followed by calcination at high temperatures. Using this method, we were able to obtain active NVP materials with relatively high purity while allowing a uniform surface coating with carbon layers about 3-4 nm thick. This structure significantly prevented NVP particle growth even after calcination at high temperatures. The NVP/C material calcined at 700 degrees C exhibited the best charge-discharge performance among the samples studied. (C) 2017 The Ceramic Society of Japan. All rights reserved.

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  • Environmentally friendly Rb3V5O14 fluorescent red pigment

    Sun Woog Kim, Takuya Hasegawa, Mizuki Watanabe, Kazuma Sugimoto, Yu Saito, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    DYES AND PIGMENTS   136   219 - 223   2017.1

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    Rb3V5O14, which was successfully synthesized by a water assisted solid state reaction (WASSR) method, is a fluorescent red pigment that is environmentally friendly. The Rb3V5O14 fluorescent pigment showed a strong optical absorption in the green light region due to the energy transfer from O2- 2p orbital to V5+ 3d orbital of VO5 polyhedra and band-gap energy of Rb3V5O14 was 2.02 eV. The fluorescent pigment presented a broad red emission peaked at 625 nm due to the T-3(2) -> (1)A(1) and T-3(1) -> (1)A(1) transitions of the [VO4](3-) group. The Rb3V5O14 fluorescent pigment showed a bright-vivid red body color, and the L*, a*, and b* values were 47.4, +45.9, and +34.4, respectively. (C) 2016 Elsevier Ltd. All rights reserved.

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  • Development of a novel nontoxic vivid violet inorganic pigment - Mn3+-doped LaAlGe2O7

    Sun Woog Kim, Yu Saito, Takuya Hasegawa, Kenji Toda, Kazuyoshi Uematsu, Mineo Sato

    DYES AND PIGMENTS   136   243 - 247   2017.1

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    Novel nontoxic LaAl1-xMnxGe2O7 (0.01 <= x <= 0.20) violet pigments were synthesized through a conventional solid-state reaction. The crystal structures, optical properties, and color properties of these pigments were investigated. The LaAl1-xMnxGe2O7 (0.01 <= x <= 0.20) pigments prepared in the present study show excellent potential as environmentally friendly inorganic violet pigments. These pigments exhibit a strong optical absorption in the yellow-red light region due to the Mn3+ d-d transitions, which is the origin of the violet color. Among the obtained LaAl1-xMnxGe2O7 (0.01 <= x <= 0.20) pigments, LaAl0.90Mn0.10Ge2O7 showed the most vivid violet color and the L*, a*, and b* values are 50.8, 18.0, and -29.7, respectively, values greater than those of a commercial cobalt violet pigment (Co-3(PO4)(2); L* = 46, a* = 33, b* = 32). Because the LaAl0.90Mn0.10Ge2O7 pigment is composed of nontoxic elements, this pigment can be an effective alternative to currently used commercial violet pigments. (C) 2016 Elsevier Ltd. All rights reserved.

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  • Determination of the crystal structure and photoluminescence properties of NaEu1-xGdx(MoO4)(2) phosphor synthesized by a water-assisted low-temperature synthesis technique

    Takuya Hasegawa, Sun Woog Kim, Yusuke Abe, Masaru Muto, Mizuki Watanabe, Tatsuro Kaneko, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato, Junko Koide, Masako Toda, Yoshiaki Kudo

    RSC ADVANCES   7 ( 40 )   25089 - 25094   2017

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    A single-phase red-emitting NaEu(MoO4)(2) phosphor with nanosized particles was synthesized using a water-assisted solid state reaction (WASSR) method, a new low-temperature synthesis method developed by our group. NaEu(MoO4)(2) exhibits a monoclinic structure with a space group C2/c (no. 15), which is composed of a Na/EuO8 dodecahedron with the site occupancy of Na/Eu = 1 : 1 and an MoO4 tetrahedron. To enhance the emission intensity of the NaEu(MoO4)(2) phosphor, Gd3+ was doped into the Eu3+ sites and NaEu1-xGdx(MoO4)(2) (0 < x <= 0.50) samples were synthesized using the WASSR method. The emission intensity of the phosphors was successfully enhanced by increasing the Gd3+ content in the samples with 0 <= x <= 0.30, but was reduced with x > 0.30. This indicates that the optimum composition of the phosphor for achieving a high emission intensity that is similar to 3.8 times higher than that of the NaEu(MoO4)(2) (x = 0) phosphor is NaEu0.70Gd0.30(MoO4)(2). These phosphors exhibit a granular particle morphology with the particle size of the phosphor being similar to 200 nm.

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  • Synthesis of Li2SiO3 using novel water-assisted solid state reaction method

    Mizuki Watanabe, Jun Inoi, Sun Woog Kim, Tatsuro Kaneko, Ayano Toda, Mineo Sato, Kazuyoshi Uematsu, Kenji Toda, Junko Koide, Masako Toda, Emiko Kawakami, Yoshiaki Kudo, Takaki Masaki, Dae Ho Yoon

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   125 ( 6 )   472 - 475   2017

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    Single phase of orthorhombic Li2SiO3 was synthesized via a novel soft-chemical synthesis method, water assisted solid state reaction method at 343-353K for 60 min. The crystal structure of the samples was characterized by X-ray diffraction (XRD) analysis. The scanning electron microscope (SEM) observation revealed that the estimated size of the particles is 50-200 nm. The XRD patterns and SEM images were compared to those of samples by a conventional solid state method at 1173K for 4 h. (C) 2017 The Ceramic Society of Japan. All rights reserved.

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  • Formation of nanophosphors using novel water assisted solid state reaction Reviewed

    Kenii Toda, Sun Woog Kim, Tadashi Ishigaki, Takuya Hasegawa, Yusuke Abe, Yusuke Shibuta, Kazuyoshi Uematsu, Mirteo Sato, Yoshiaki Kudo

    Proceedings of the International Display Workshops   1   622 - 625   2017

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    © 2017 Proceedings of the International Display Workshops. All rights reserved. We reported novel soft chemistry for the preparation of nanophosphors. Novel water assisted solid state reaction (WASSR) method is very simple andean synthesize many ceramic materials just by storing or mixing of raw materials added a small amount of water in a reactor at low temperature.

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  • Luminescence of phosphor balls prepared using melt quenching synthesis method Reviewed

    Takuya Hasegawa, Kenji Toda, Tadashi Ishigaki, Shinnosuke Kamei, Sun Woog Kim, Kazuyoshi Uematsu, Mineo Sato, Masahiro Yoshimura

    Materials Science Forum   883   17 - 21   2017

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    © 2017 Trans Tech Publications, Switzerland. Well-grown M3MgSi2O8 (M = Ca, Sr and Ba):Eu2+ phosphors were synthesized by novel melt quenching synthesis method. The luminescence property of the Sr3MgSi2O8:Eu2+ phosphor synthesized by the melt synthesis method is comparable to those of the sample synthesized by a conventional solid state reaction. Sintered phosphor balls with excellent luminescent characteristics were obtained.

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  • Development of water assisted solid state reaction for the ceramic materials Reviewed

    Kenji Toda, Sun Woog Kim, Takuya Hasegawa, Mizuki Watanabe, Tatsuro Kaneko, Ayano Toda, Ryota Yamanashi, Shota Kumagai, Masaru Muto, Atsushi Itadani, Mineo Sato, Kazuyoshi Uematsu, Tadashi Ishigaki, Junko Koide, Masako Toda, Emiko Kawakami, Yoshiaki Kudo, Takaki Masaki, Dae Ho Yoon

    Key Engineering Materials   751 KEM   353 - 357   2017

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    © 2017 Trans Tech Publications, Switzerland. We report a novel soft chemical synthesis method, water assisted solid state reaction (WASSR) method. This method is very simple and can synthesize many ceramic materials just by storing or mixing raw materials added a small amount of water in a reactor at low temperature below 373 K. For example, well-crystalline SrMoO4 was obtained using the WASSR method.

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  • Improvement of Emission Intensity for Near-infrared-emitting Ca14Zn6Al10O35:Mn4+ Phosphor by Oxygen-pressure Method

    Takuya Hasegawa, Sun Woog Kim, Takeshi Abe, Shota Kumagai, Ryota Yamanashi, Kohei Seki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    CHEMISTRY LETTERS   45 ( 9 )   1096 - 1098   2016.9

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    We employed an oxygen-pressure method as a novel approach to improve the emission intensity of a Ca14Zn6Al10O35:Mn4+ phosphor. With this new approach, the Ca14Zn6Al10O35:Mn4+ phosphor exhibited near-infrared emission under excitation at 450 rim, and the emission intensity of a Caw Zn-6(Al0.97Mn0.03)(10)O-35 phosphor was effectively enhanced by approximately 143% compared with that of a Ca14Zn6(Al0.97Mn0.03)(10)O-35 phosphor synthesized by a conventional solid-state reaction method in air.

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  • Rare-earth-free white emitting Ba2TiP2O9 phosphor: revealing its crystal structure and photoluminescence properties International journal

    Takuya Hasegawa, Sun Woog Kim, Shinnosuke Kamei, Tadashi Ishigaki, Kazuyoshi Uematsu, Koutoku Ohmi, Kenji Toda, Mineo Sato

    DALTON TRANSACTIONS   45 ( 28 )   11554 - 11559   2016.7

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    A high intensity bluish-white emitting Ba2TiP2O9 phosphor was synthesized by a conventional solid-state reaction method and the precise crystal structure was investigated for the first time by Rietveld refinement analysis. Ba2TiP2O9 has a monoclinic crystal structure with a space group C2/c (no. 15), which is built out of PO4 tetrahedra and TiO5 pyramidal polyhedra connected to form a chain structure along the c-axis. The emission of Ba2TiP2O9 is due to a charge transfer transition between Ti(4+)-O(2-) in the pyramidal TiO5. The obtained Ba2TiP2O9 was excited efficiently by UV and VUV and displayed a bright bluish-white luminescence.

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  • Abnormal improvement in emission of lanthanum oxysulfide phosphor La2O2S:Tb3+ synthesized by a novel method, thermal decomposition in eutectic molten salt

    Sun Woog Kim, Takuya Hasegawa, Takeshi Abe, Hiroko Nakagawa, Shota Hasegawa, Kohei Seki, Kenji Toda, Kazuyoshi Uematsu, Tadashi Ishigaki, Mineo Sato

    CERAMICS INTERNATIONAL   42 ( 8 )   10389 - 10392   2016.6

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    The lanthanum oxysulfide phosphor La2O2S:Tb3+ is generally synthesized by the direct sulfidation of La2O3 using H2S or CS2 gas. However, these gases are known to be highly toxic to humans. In this paper, a new synthesis method that uses 0.6U(2)SO(4)-0.4Na(2)SO(4) as the flux is proposed for obtaining La2O2S:Tb3+ phosphor, without the need for H2S or CS2 gas. The proposed method consists of two steps: 1) oxidation to obtain La2O2SO4 and 2) reduction to reduce La2O2SO4 to La2O2S. Using this novel method, (La1-xTbx)(2)O2S (0.01 <x < 0.13) were successfully synthesized in a single-phase form. The synthesized phosphors exhibited extraordinary luminescence behavior. Further, despite their low Tb3+ ion content, the phosphors showed high emission intensities. The relative emission intensity of (La0.95Tb0.05)(2)O2S (lambda(ex) = 270 nm) was 132% that of the commercial green-emitting phosphor (La0.52Ce0.31Tb0.17)PO4 (lambda(ex) = 285 nm), which shows the highest excitation absorption. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

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  • Novel yellowish white-emitting Eu2+-activated phosphate phosphor based on Rb2Ba3P4O14

    Kazuma Sugimoto, Takuya Hasegawa, Sun Woog Kim, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    JOURNAL OF CERAMIC PROCESSING RESEARCH   17 ( 5 )   401 - 404   2016.5

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    Eu2+-doped Rb2Ba3P4O14 phosphors were synthesized in a single phase form by a conventional solid state reaction method and their optical properties were characterized. These phosphors showed broad optical absorption bands that can cover the UV and near-UV region, and exhibited a narrow deep-blue emission and broad reddish-yellow emission with peaks at 423 nm and 550 nm, respectively. The highest reddish-yellow emission intensity was obtained for Rb-2(Ba0.99Eu0.01)(3)P4O14.

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  • Color tuning of oxide phosphors Reviewed

    Sun Woog Kim, Kenji Toda, Takuya Hasegawa, Kazuyoshi Uematsu, Mineo Sato

    Phosphors, up Conversion Nano Particles, Quantum Dots and Their Applications: Volume 1   219 - 246   2016.1

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    © Springer-Verlag Berlin Heidelberg 2017. In white-LED application, the development of novel phosphors with high luminescence efficiency and high-emission color purity is extremely important because the performance of white LEDs is directly affected by the luminescence properties of the phosphors. In this chapter, therefore, we review some Eu2+- and Ce3+-activated phosphor materials and discuss the luminescence properties of these phosphors from the viewpoint of the relationship between the emission-band position and the crystallographic environment including the local site symmetry of the dopant site in the host lattice. We also propose a material-design concept to develop long wavelength-emission phosphors.

    DOI: 10.1007/978-3-662-52771-9_7

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  • Novel soft chemical synthesis methods of ceramic materials Reviewed

    Kenji Toda, Sun Woog Kim, Takuya Hasegawa, Mizuki Watanabe, Tatsuro Kaneko, Ayano Toda, Atsushi Itadani, Mineo Sato, Kazuyoshi Uematsu, Tadashi Ishigaki, Junko Koide, Masako Toda, Yoshiaki Kudo, Takaki Masaki, Dae Ho Yoon

    Key Engineering Materials   690   268 - 271   2016

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    © 2016 Trans Tech Publications, Switzerland. We report novel soft chemical synthesis method, solid hydratethermal reaction (SHR) method as a new soft chemistry. This method is very simple and can synthesize the ceramic materials just by storing the mixture of raw materials added a small amount of water in a reactor at low temperature below 373 K. For example, Nano-size YVO4 (under 100 nm in diameter) was obtained using the SHR method.

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  • Improvement of High Rate Performances for Ti-Doped Li3V2(PO4)(3) Cathode Materials

    Dai Okada, Fumiya Nakano, Kazuyoshi Uematsu, Hirokazu Okawa, Atsushi Itadani, Kenji Toda, Mineo Sato

    ELECTROCHEMISTRY   83 ( 10 )   828 - 830   2015.10

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    Ti-doped lithium vanadium(III) phosphate cathode materials, Li3-2x(V1-xTix)(2)(PO4)(3), were prepared by a solid state reaction. The Ti-doped samples exhibited that the gamma-phase is stabilized at room temperature by substituting Ti for V sites at more than x = 0.10. The discharge capacity of the doped samples at a 60C rate was found to be much higher than that for the non doped sample. This improved performance found for the doped cathodes was attributed to the increase in ionic conductivity given by the transition of alpha- to gamma-phase via Ti substitution. (C) The Electrochemical Society of Japan, All rights reserved.

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  • Electrochemical Properties of LiFePO4 Cathode Materials Coated with Newly Developed Carbon Black

    Dai Okada, Takuma Sugiki, Kazuyoshi Uematsu, Atsushi Itadani, Kenji Toda, Mineo Sato, Togo Yamaguchi, Nozomi Arimitsu, Shogo Nishikawa

    ELECTROCHEMISTRY   83 ( 10 )   858 - 860   2015.10

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    A new type of carbon black CB1 was developed, by Asahi Carbon Co., Ltd., for usage of a lithium-ion battery (LIB). Compared with commercially available acetylene black, CB1 in which the network structure of carbon is developed has a relatively larger specific surface area. Therefore, CB1 dispersed in LiFePO4 precursors by planetary ball milling inhibited LiFePO4 primary particles' growth during calcination process. Charge/discharge performance was improved by coexistence of CB1 with polystyrene (PS) carbon layers deposited on LiFePO4 particle surfaces, compared to the performance for the LiFePO4 sample covered with carbon layers derived from only PS. (C) The Electrochemical Society of Japan, All rights reserved.

    DOI: 10.5796/electrochemistry.83.858

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  • Novel green-emitting Ho3+-doped scandate phosphors

    Kazuma Sugimoto, Sun Woog Kim, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   123 ( 1441 )   880 - 883   2015.9

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    Blue-light excitable, green-light emitting Ba-3(Sc1-xHox)(4)O-9 phosphors were successfully synthesized in the single-phase form by a melt synthesis method for the first time. These phosphors show sharp green light emission under blue light (455 nm) excitation. The principal green light emission peak observed at 555 nm corresponds to the transition from F-5(4) and S-5(2) to the I-5(8) energy level of Ho3+. (C) 2015 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.123.880

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  • Synthesis of YVO4 Nano Particles by Novel Room Temperature Synthesis Method

    Tatsuro Kaneko, Sun Woog Kim, Ayano Toda, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato, Junko Koide, Masako Toda, Yoshiaki Kudo, Takaki Masaki, Dea Ho Yoon

    SCIENCE OF ADVANCED MATERIALS   7 ( 8 )   1502 - 1505   2015.8

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    Yttrium orthovanadate, YVO4 was prepared using a novel water assisted room temperature solid state reaction method, consisting of simply mixing of Y2O3 and V2O5 at room temperature with the addition of a small amount of water. Nano-scale spherical particles of YVO4 approximately 10-100 nm in diameter were obtained.

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  • Synthesis and Luminescent Properties of Novel Ca3Y3Ge2BO13:Ln(3+) (Ln(3+) = Tb3+ and Eu3+) phosphors

    Takuya Hasegawa, Natsuki Sato, Sun Woog Kim, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   123 ( 1438 )   507 - 511   2015.6

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    Novel Ln(3+)-doped (Ln(3+) = Tb3+ and Eu3+) and Eu3+, Bi3+ co-doped Ca3Y3Ge2BO13 phosphors were synthesized by a conventional solid-state reaction method. Tb3+- and Eu3+-doped phosphors showed strong narrow green and red emission due to 4f intra-shell transitions of the Tb3+ or Eu3+ ions under the excitation at 254 nm. Bi3+ co-doped Ca3Y3Ge2BO13:Eu3+ phosphor has a new broad strong excitation band appeared at around 302 nm due to S-1(0)-> P-3(1) transition of Bi3+, and presents red emission owing to 4f-4f transition of Eu3+ under excitation at 302 nm. (C)2015 The Ceramic Society of Japan. All rights reserved.

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  • Viscosity analysis of alkali metal carbonate molten salts at high temperature

    Sun Woog Kim, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   123 ( 1437 )   355 - 358   2015.5

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    The viscosities of unary, binary, and ternary eutectic alkali metal carbonate molten salts were measured for the first time by a rotation method using a high-temperature rheometer system and the reliability of the viscosity values was evaluated. The viscosity values obtained in this study are similar to that reported by Sato's research group, which is considered to have the highest reliability among the studies reported till date. The standard errors in the viscosity values at each temperature are less than +/- 5%. (C) 2015 The Ceramic Society of Japan. All rights reserved.

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  • Synthesis of new green-emitting KBa1-xScSi3O9:Eu-x(2+) phosphors for white LEDs

    Takeshi Abe, Sun Woog Kim, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    OPTICAL MATERIALS   38   57 - 60   2014.12

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    New green-emitting KBa1-xScSi3O9:Eu-x(2+) phosphors for white LEDs were synthesized by a conventional solid-state reaction method. The obtained KBa1_xScSi3O9:Eu-x(2+) phosphors show the strong broad optical absorption band from UV to blue light region and exhibit broad green emission with a peak at 521 nm under excitation at 405 nm due to the allowed 4f(6)5d(1)-4f(7) transition of Eu2+. Optimization of Eu2+ concentration resulted in the highest green emission peak intensity was obtained at the composition of KBa0.94ScSi3O9:Eu-0.06(2+), and the relative emission intensity of this phosphor was 32% of that of a commercial YAG:Ce3+ phosphor. (C) 2014 Elsevier B.V. All rights reserved.

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  • Synthesis and Photoluminescence Properties of HEu1-xGdx(MoO4)(2) Nanophosphor

    Mizuki Watanabe, Kazuyoshi Uematsu, Sun Woog Kim, Kenji Toda, Mineo Sato

    IEICE TRANSACTIONS ON ELECTRONICS   E97C ( 11 )   1063 - 1067   2014.11

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    New HEu1-xGdx(MoO4)(2) nanophosphors were synthesized by a simple one-step ion-exchange method. These nanophosphors have rod-like particle morphology with 0.5-15 mu m in length and outer diameters in the range of 50-500 nm. By optimization of the composition, the highest emission intensity was obtained for the samples with x = 0.50 for both KEu1-xGdx(MoO4)(2) and HEu1-xGdx(MoO4)(2).

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  • Site engineering concept of Ce3+-activated novel orange-red emission oxide phosphors

    Yukari Kawano, Sun Woog Kim, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Hiromitsu Takaba, Mineo Sato

    OPTICAL MATERIALS EXPRESS   4 ( 9 )   1770 - 1774   2014.9

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    Novel Sr-6(Y1-xCex)(2)Al4O15 (0.005 <= x <= 0.20) phosphors were synthesized in a single phase form by a conventional solid-state reaction method. These phosphors can be achieved the emission color tunable from blue to orange-red by controlling the Ce3+ doping site in the Sr6Y2Al4O15 lattice and exhibit orange-red emission centered on 600 nm by blue light irradiation as the Ce3+ concentration was increased. To the best of our knowledge, this is the first report of Ce3+ doping oxide phosphor exhibiting orange-red emission centered on 600 nm under blue light excitation. (C) 2014 Optical Society of America

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  • Novel Deep Red Emitting Phosphors Ca14Zn6M10:Mn4+ (M = Al3+ and Ga3+)

    Kohei Seki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    CHEMISTRY LETTERS   43 ( 8 )   1213 - 1215   2014.8

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    This study investigated the luminescence properties of novel deep red phosphors Ca14Zn6M10O35:Mn4+ (M = Al3+ and Ga3+). These phosphors efficiently excited using a blue LED light. It exhibited a deep red emission around 713 nm. The luminescence intensities of CZA:Mn-0.03 and CZG:Mn-0.03 excited at 450 nm were, respectively, about 2.2 and 2.7 times higher than that of YAG:Ce3+ (P46). These phosphors also show little temperature quenching, but more than that shown by YAG:Ce3+ at 423 K. These results show that the deep red phosphor Ca14Zn6M10O35:Mn4+ (M = Al3+ and Ga3+) is a beneficial phosphor for use in indoor plant cultivation.

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  • Novel Reddish Yellow-emitting Ce3+-Doped Ba3Sc4O9 Phosphors for Blue-light-based White LEDs

    Takuya Hasegawa, Sun Woog Kim, Tadashi Ishigaki, Kazuyoshi Uematsu, Hiromitsu Takaba, Kenji Toda, Mineo Sato

    CHEMISTRY LETTERS   43 ( 6 )   828 - 830   2014.6

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    Novel reddish yellow-emitting Ba-3(Sc1-xCex)(4)O-9 (0 <= x <= 0.01) phosphors were synthesized in a single-phase form by a conventional solid-state reaction method. These phosphors exhibited excellent optical absorption in the blue-light region and showed reddish yellow emission with a peak at 583 urn due to the 5d -> 4f transition of Ce3+ under excitation at 437 nm. By optimizing the Ce3+ concentration, the maximum emission intensity was obtained for Ba-3(Sc0.999Ce0.001)(4)O-9.

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  • Synthesis of FeF3 fluoride electrode material using polytetrafluoroethylene

    Hirotaka Torii, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   122 ( 1426 )   473 - 476   2014.6

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    A fluoride electrode material for lithium-ion batteries, FeF3, was synthesized by a novel solid-state reaction method using polytetrafluoroethylene (PTFE) as a fluoride source instead of HF. FeF3 was obtained as the main phase according to the XRD patterns of the samples prepared in the present study. Furthermore, the synthesized FeF3 particles were nanosize. The initial discharge and charge capacities of the FeF3 sample were 387 and 293mAh/g, respectively, in the 4.5-1.0V region. (C) 2014 The Ceramic Society of Japan. All rights reserved.

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  • Synthesis of Eu2+-activated Rb-Ba-Sc-Si-O glass phosphors using melt synthesis technique

    Sun Woog Kim, Takuya Hasegawa, Michiyo Inoue, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   122 ( 1426 )   452 - 463   2014.6

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    Eu2+-activated Rb-Ba-Sc-Si-O glass phosphor was synthesized by a melt synthesis technique using arc-imaging furnace and their photoluminescence properties were characterized. In addition, the obtained glass phosphors annealed in a flow of 5%H-2-95% Ar gas to enhance the luminescent efficiency. The emission spectra of the Eu2+-activated glass phosphors presents yellow emission band centered at 537nm due to the 4f(6)5d(1) -> 4f(7) transition of Eu2+, and the emission intensity was effectively enhanced by the annealing treatment. (C) 2014 The Ceramic Society of Japan. All rights reserved.

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  • Synthesis and the luminescent properties of NaAlSiO4 : Eu2+ phosphor using SiO powder as a silica source

    Takeshi Abe, Sun Woog Kim, Tadashi Ishigaki, Kazuyoshi Uematsu, Mineo Sato, Takaki Masaki, Dae Ho Yoon, Kenji Toda

    JOURNAL OF INFORMATION DISPLAY   15 ( 1 )   31 - 35   2014

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    A yellow-emitting silicate phosphor, NaAlSiO4 : Eu2+, was synthesized through a new reducing technique, using SiO powder as a silica source, during the preparation process. The addition of SiO powder as a silica source significantly enhanced the Eu2+ content, which led to an increase in the photoluminescence emission intensity of the NaAlSiO4 : Eu2+ phosphor. The optimization of the composition resulted in obtaining the maximum emission intensity for NaAlSiO4 : 7 mol% Eu2+.

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  • Title Synthesis and photoluminescence properties of Mn2+ co-doped white emitting (Sr,Sn)ZnP2O7 phosphor

    Sun Woog Kim, Takuya Hasegawa, Hiroyuki Yumoto, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    JOURNAL OF CERAMIC PROCESSING RESEARCH   15 ( 3 )   177 - 180   2014

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    Rare earth-free white emitting (Sr,Sn)(Zn,Mn)P2O7 phosphors were synthesized in a single phase form by a conventional solid-state reaction method and photoluminescent properties were characterized. These phosphors showed three broad band in emission spectra at 340, 440, and 690 nm, and the ratio of emission intensity between blue-green light and red light changes with Mn2+ content increasing because of energy transfer from Sn2+ to Mn2+. The emission color of the phosphors varied from blue-white to orange-white with the increase in the Mn2+ content and the emission color of the (Sr0.90Sn0.10)(Zn0.97Mn0.03)P2O7 phosphor was very close to white light.

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  • A novel bluish green-emitting RbBaScSi3O9 : Eu2+ phosphor for white LEDs

    Takeshi Abe, Sun Woog Kim, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    JOURNAL OF CERAMIC PROCESSING RESEARCH   15 ( 3 )   181 - 184   2014

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    A novel bluish green-emitting silicate phosphor, RbBaScSi3O9 : Eu2+, was synthesized by a conventional solid state reaction method. The RbBaScSi3O9 : Eu2+ phosphor can be excited by a near-UV and blue light irradiation and presents a bluish green band centered at 500 nm due to the allowed transition from 4f(6)5d(1) to 4f(7) of Eu2+. The maximum emission peak intensity was obtained at the composition of RbBaScSi3O9 : 10 mol% Eu2+, and the emission intensity was 13% compared with that of the commercial YAG phosphor.

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  • Synthesis and photoluminescence properties of HEu(MoO4)(2) nanophosphor

    Mizuki Watanabe, Kazuyoshi Uematsu, Sun Woog Kim, Kenji Toda, Mineo Sato

    JOURNAL OF CERAMIC PROCESSING RESEARCH   15 ( 3 )   173 - 176   2014

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    The HEu(MoO4)(2) nanophosphor was synthesized for the first time by the H+-exchange of KEu(MoO4)(2). The nanophosphor obtained in the present study maintain the triclinic KEu(MoO4)(2) type structure in a single phase form with high crystallinity. The HEu(MoO4)(2) phosphor has rod-like particle morphology (length 0.5-20 mu m, diameter 50-400 nm). Both HEu(MoO4)(2) powder and solution shows red emission due to the 4f-4f transition of Eu3+.

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  • Synthesis of blue-emitting (K1-xNax)Mg-4(PO4)(3):Eu2+ phosphors

    Sun Woog Kim, Takuya Hasegawa, Tadashi Ishigaki, Kazuyoshi Uematsu, Mineo Sato, Kenji Toda

    JOURNAL OF INFORMATION DISPLAY   15 ( 2 )   53 - 57   2014

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    Blue-emitting (K1-xNax)Mg-4(PO4)(3):Eu2+ phosphors were synthesized through a conventional solid-state reaction method, and their photoluminescence properties were characterized. These phosphors exhibited the typical emission band assigned to the transition from 4f(6)5d(1) to 4f(7) of Eu2+, and the emission intensity was effectively enhanced by Na+-doping into the host lattice. The highest blue emission peak intensity was obtained for (K0.65Na0.35)Mg-4(PO4)(3):1 mol% Eu2+, where the relative emission peak intensity was 33% of that for the commercial blue-emitting BaMgAl10O17:10mol%Eu2+ phosphor. In addition, these phosphors have excellent thermal stability in the temperature quenching effect.

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  • Hydrothermal synthesis of meso/macroporous BiVO4 hierarchical particles and their photocatalytic degradation properties under visible light irradiation International journal

    Puttaswamy Madhusudan, Malahalli Vijaya Kumar, Tadashi Ishigaki, Kenji Toda, Kazuyoshi Uematsu, Mineo Sato

    ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH   20 ( 9 )   6638 - 6645   2013.9

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    An ordered hierarchical meso/macroporous monoclinic bismuth vanadate (BiVO4) particle was fabricated for the first time by a simple two-step melamine template hydrothermal method followed by calcination. The physiochemical parameters of as-prepared porous materials were characterized by means of X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, Raman, Barrett-Emmett-Teller, and UV-vis techniques. The nitrogen adsorption-desorption measurement and pore size distribution curve suggest that meso/macropores exist in these hierarchical microarchitectures. Further, it is found that melamine plays a significant role in the formation of porous BiVO4 particles, and when a known amount of melamine was added, the surface area and pore size of such porous BiVO4 particles were increased. The photocatalytic activities of the as-prepared hierarchical BiVO4 samples were measured for the photodegradation of Congo red aqueous dye solution under visible light irradiation. Surprisingly, the porous BiVO4 particles showed outstanding photocatalytic activities than polycrystalline BiVO4 sample. The possible enhancement of such catalytic performance has also been further discussed.

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  • Long phosphorescent Ca2SnO4 with minuscule rare earth dopant concentration International journal

    Tadashi Ishigaki, Akiko Torisaka, Kentarou Nomizu, Puttaswamy Madhusudan, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    DALTON TRANSACTIONS   42 ( 14 )   4781 - 4785   2013.4

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    Rare-earth doped Ca2SnO4 phosphors were synthesized using a conventional solid state reaction method. The red phosphorescence of Eu(3+) was observed in this system with persistence time. In the as-prepared samples, the doped rare earth ions occupied both Ca and Sn sites in the host lattice. The longest phosphorescent persistence property can be achieved for the Ca2SnO4 phosphors with a 0.1% Eu dopant. Depending on the doped rare earth ions, afterglow emissions of various colors were observed.

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  • Synthesis and luminescence properties of rare earth doped Na3AlP3O9N oxynitridophosphate phosphor

    Sosuke Sato, Shinnosuke Kamei, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato, Hideki Sasaoka, Masahiro Ooka, Kazuhito Nishimura

    JOURNAL OF CERAMIC PROCESSING RESEARCH   14   S74 - S76   2013.3

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    Rare earth doped Na3AlP3O9N oxynitridophosphate phosphors were prepared by a conventional solid-state reaction method. The samples were sintered at 1073 K for 6 h in NH3 atmosphere. Eu doped samples show blue emission due to the 4f(6)5d(1) -> 4f(7) transition of Eu2+. When Eu concentration was 1 mol%, the emission intensity was the highest in Eu doped samples. The Tb-doped samples showed green emission at about 550 nm doe to the D-5(4) -> F-7(5) transition of Tb3+.

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  • Luminescent properties of Eu-activated Mg-Y-Si-O-N glass and crystalline phosphors

    Sosuke Sato, Shinnosuke Kamei, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato, Hideki Sasaoka, Masahiro Ooka, Kazuhito Nishimura

    JOURNAL OF CERAMIC PROCESSING RESEARCH   14   S77 - S79   2013.3

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    Eu-activated Mg-Y-Si-O-N glass and MgYSi2O5N phosphors were prepared by a conventional solid-state reaction method. The samples were sintered at 1573-1673 K for 2 h in NH3 atmosphere. MgYSi2O5N phosphors show red emission at 611 nm. On the other hand, emissions of Mg-Y-Si-O-N glass phosphors were shifted from blue (at about 450 nm) to yellow (at about 550 nm) with increasing concentration of Eu ions. The different luminescent characteristics between MgYSi2O5N and Mg-Y-Si-O-N glass are ascribed to different valence of doped Eu ions respectively.

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  • Synthesis and Photoluminescence Studies of Eu3+ Activated Borosilicate Phosphor (Gd1-xEux)(3)BSi2O10 for White Light Emitting Diodes

    Tadashi Ishigaki, Puttaswamy Madhusudan, Michiyo Inoue, Shinnosuke Kamei, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY   2 ( 2 )   R3018 - R3020   2013

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    Certain silicate materials with different crystal structures show excellent luminescence properties. Furthermore, these silicate compounds have high chemical and thermal stability and considered as an excellent phosphor host materials. In this study, we report (Gd1-xEux)(3)BSi2O10 as a novel ultraviolet (UV) excited white phosphors prepared under solid state reaction and their luminescence properties at 393 nm excitation were investigated in detail. The as prepared (Gd1-xEux)(3)BSi2O10 phosphors showed red emission with UV (around 580-630 nm) and near-UV light (around 250-410 nm). The chromaticity coordinates (0.60, 0.34) of the prepared borosilicate phosphor were very close to the NTSC standard value (0.67, 0.33) and its emission intensity was almost similar to commercial red phosphor Y2O2S:0.05Eu(3+). Further, as prepared (Gd1-xEux)(3)BSi2O10 material is considered to be an efficient red-emitting phosphor for UV based light emitting diodes (LED). (C) 2012 The Electrochemical Society.

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  • Efficient Red Emission of Blue-Light Excitable New Structure Type NaMgPO4:Eu2+ Phosphor

    Sun Woog Kim, Takuya Hasegawa, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    ECS SOLID STATE LETTERS   2 ( 12 )   R49 - R51   2013

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    A novel red-emitting olivine-type NaMgPO4:Eu2+ phosphor was synthesized for the first time by the melt synthesis technique using arc-imaging furnace. The NaMgPO4:Eu2+ phosphor can be efficiently excited by blue light irradiation and presents red emission band centered at 628 nm due to the 4f(6)5d(1) -> 4f(7) transition of Eu2+. The highest emission peak intensity was obtained for NaMgPO4:2.5mol%Eu2+, and the internal quantum efficiency of this phosphor at the excitation wavelength of 450 nm was 81%. Furthermore, these phosphors show an excellent thermal stability on the temperature quenching effect. (C) 2013 The Electrochemical Society. All rights reserved.

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  • Redetermination of the low-temperature polymorph of Li2MnSiO4 from singlecrystal X-ray data International journal

    Mineo Sato, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Hirokazu Okawad

    ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS   68 ( Pt 9 )   I68 - +   2012.9

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    Crystals of dilithium manganese(II) silicate were grown under high-temperature hydro-thermal conditions in the system LiOH-MnO(2)-SiO(2). The title compound crystallizes in the β(II)-Li(3)PO(4) structure type. The coordination polyhedra of all cations are slightly distorted tetra-hedra (m symmetry for MnO(4) and SiO(4)), which are linked by corner-sharing to each other. The vertices of the tetra-hedra point to the same direction perpendicular to the distorted hexa-gonal close-packed (hcp) array of O atoms within which half of the tetra-hedral voids are occupied by cations. In comparison with the previous refinement from powder X-ray data [Dominko et al. (2006 ▶). Electrochem. Commun.8, 217-222], the present reinvestigation from single-crystal X-ray data allows a more precise determination of the distribution of the Li(+) and Mn(2+) cations, giving a perfectly site-ordered structure model for both Li(+) and Mn(2+).

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  • Crystal Growth of Silicate Phosphors from the Vapor Phase

    Tadashi Ishigaki, Kenji Toda, Tatsuya Sakamoto, Kazuyoshi Uematsu, Mineo Satot

    IEICE TRANSACTIONS ON ELECTRONICS   E94C ( 11 )   1745 - 1748   2011.11

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    Well-crystallized Ba2SiO4:Eu2+ powders were grown on a substrate by the vapor phase reaction between a mixed powder (barium carbonate and europium oxide) and SiO gas. The vaporization of SiO occurs at 1400-1600 degrees C from the SiO2 source (or SiO powder) in a reducing atmosphere. The formed SiO gas was transported by 95 vol% Ar - 5 vol% H-2 gas and reacted with the raw material powders. The emission intensity of the Ba2SiO4:Eu2+ phosphor synthesized by the new vapor phase technique is about 2.6 times higher than that of a conventional solid-state reaction sample.

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  • Combinatorial synthesis of phosphors using arc-imaging furnace. International journal

    Tadashi Ishigaki, Kenji Toda, Masahiro Yoshimura, Kazuyoshi Uematsu, Mineo Sato

    Science and technology of advanced materials   12 ( 5 )   054205 - 054205   2011.10

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    We have applied a novel 'melt synthesis technique' rather than a conventional solid-state reaction to rapidly synthesize phosphor materials. During a synthesis, the mixture of oxides or their precursors is melted by light pulses (10-60 s) in an arc-imaging furnace on a water-cooled copper hearth to form a globule of 1-5 mm diameter, which is then rapidly cooled by turning off the light. Using this method, we synthesized several phosphor compounds including Y3Al5O12:Ce(YAG) and SrAl2O4:Eu,Dy. Complex phosphor oxides are difficult to produce by conventional solid-state reaction techniques because of the slow reaction rates among solid oxides; as a result, the oxides form homogeneous compounds or solid solutions. On the other hand, melt reactions are very fast (10-60 s) and result in homogeneous compounds owing to rapid diffusion and mixing in the liquid phase. Therefore, melt synthesis techniques are suitable for preparing multi component homogeneous compounds and solid solutions.

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  • Synthesis of anataseTiO(2) having high specific surface area from a gel precursor

    Keiko Fukushi, Sae Nakajima, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato

    ELECTROCERAMICS IN JAPAN XIV   485   279 - +   2011

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    Anatase TiO2 having high temperature stability and specific surface area was synthesized using a gel precursor in very mild conditions. The precursor gel was obtained by dialysis treatment of Na16Ti10O28-HNO3 solution. The samples were characterized by X-ray diffraction analysis, transmission electronmicroscopy, Brunner-Emmett-Teller method for specific surface area measurements, and thermogravimetric analysis.

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  • Development of gas-solid phase hybrid synthesis method of single crystal Ba2SiO4:Eu2+

    Tatsuya Sakamoto, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato

    ELECTROCERAMICS IN JAPAN XIV   485   325 - +   2011

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    We succeeded in the single crystal growth of Ba2SiO4:Eu2+ by novel synthesis method which was gas (SiO) and solid (Ba - Sc - Al - Eu - 0) phase hybridized. The Ba2SiO4:Eu2+ single crystal was synthesized by interfacial crystal growth after the reaction of the SiO gas with the surface of Ba - Sc - Al - Eu - O substrate in the reductive atmosphere. The single crystals were plate-like crystals with about 500 mu m sizes and emitted green light around 500 nm under 300 - 450 nm excitation.

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  • Synthesis of Eu2+-doped A-site and oxygen-deficient perovskite related host for photoluminescent materials

    Tadashi Ishigaki, Tomoki Hatsumori, Tatsuya Sakamoto, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 9   8 ( 9 )   2728 - 2730   2011

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    Perovskite-related compounds have been investigated in many fields, because they have various unique properties due to their compositions and structures which are characterized by various combinations of the A and B cations. In addition, defect perovskite-type compounds have also been investigated in many areas, especially as ion conductors. In this study, we used the A-site and oxygen-deficient perovskite, Sr3Al2O6, as a photoluminescent host material. This means that the defect sites were able to substitute several ions. We investigated the A(3)Al(2)O(6):Eu2+ phosphor material (A = Mg, Ca, Sr, Ba) produced by a solid state reaction in several kinds of atmospheres. Based on our results, the phosphor showed wide excitation and emission bands of 300-400 nm and 450-600 nm, respectively. The emission color control depended on the A-site substitution ratio. It is a very useful phosphor for white LEDs. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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  • Microwave synthesis technique for long phosphorescence phosphor SrAl2O4:Eu2+, Dy3+ using carbon reduction

    Tadashi Ishigaki, Hitomi Mizushina, Kazuyoshi Uematsu, Nobuhiro Matsushita, Masahiro Yoshimura, Kenji Toda, Mineo Sato

    MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS   173 ( 1-3 )   109 - 112   2010.10

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    As described herein, we prepared SrAl2O4:Eu2+, Dy3+ phosphor using a domestic microwave oven operated at 2.45 GHz with 500 Win 30 min, processes with carbon reduction. Using carbon as the microwave absorber it generates thermal energy. Furthermore, heating with carbon can provide a reductive atmosphere. Prepared samples emitted phosphorescence emission for a long time. (C) 2009 Elsevier B.V. All rights reserved.

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  • Synthesis and luminescence property of new phosphate phosphor, RbPO3:Tb

    Ayano Toda, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato

    MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS   173 ( 1-3 )   168 - 170   2010.10

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    Luminescence property of a new phosphate phosphor, RbPO3:Tb, is reported in this paper. A single phase sample was obtained by thermal decomposition of a raw material mixture (RbH2PO4 and Tb4O7) at 973 K. The phosphor could be efficiently exited by the UV light, yielding an intense green emission around 550 nm. The intense green emission is originated from the f-f transition of Tb3+ ion. (C) 2009 Elsevier B.V. All rights reserved.

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  • Melt synthesis of Eu-doped oxide phosphors using arc-imaging furnace

    Tadashi Ishigaki, Masahiro Yoshimura, Nobuhiro Matsushita, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   30 ( 2 )   165 - 169   2010.1

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    To synthesize various complex oxide materials and their solid solutions, we applied a novel "melt-synthesis technique" rather than conventional solid-state reaction techniques. Rapid synthesis methods to develop those double oxides have been strongly anticipated. During melt synthesis, the mixture of oxides or their precursors is melted rapidly (1-60 s) in an arc-imaging furnace using strong light radiation. A spherical molten sample with multiple homogeneously mixed cations was solidified directly on a copper hearth with rapid cooling of ca. 10(2) degrees C/s.We studied the synthesis of A(2)BO(4) type double oxides (AA')(2)BO(4) (A= Sr(2+), Ca(2+), A' = La(3+), Gd(3+), Y(3+), Eu(3+), B=Al) using this method. Homogeneous samples with Eu(3+) dopants were synthesized using liquid phase mixing in a few seconds, which is much faster than diffusions of ions in solid phase. Red fluorescence under the irradiation of ultraviolet light (254 and 365 nm) was observed. The excitation band shifted. (C) 2009 Elsevier Ltd. All rights reserved.

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  • Development of New Red Phosphor Na3YSi2O7:Eu3+ for a white LED

    Shinichiro Kousaka, Kenji Toda, Tadashi Ishigaki, Kazuyoshi Uematsu, Mineo Sato

    ASIAN CERAMIC SCIENCE FOR ELECTRONICS III AND ELECTROCERAMICS IN JAPAN XII   421-422   360 - +   2010

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    New red phosphors Na3YSi2O7:Eu3+ was prepared by a conventional solid-state reaction. This silicate phosphor can be efficiently excited by near UV light, yielding an intense red emission. Under the excitation of near UV light, the emission intensity is higher than that of a commercial red phosphor Y2O2S:Eu3+.

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  • New Titanium Oxide Compound for Photocatalytic Water Splitting, Hydrous Na16Ti10O28

    Sae Nakajima, Soichiro Watanabe, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato

    ASIAN CERAMIC SCIENCE FOR ELECTRONICS III AND ELECTROCERAMICS IN JAPAN XII   421-422   546 - +   2010

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    Photochemical splitting of water into H-2 and O-2 using solar energy is process of great economic and environmental interest. In this study, we investigated novel photocatalytic compound, Na16Ti10O28, for water splitting. Na16Ti10O28 was prepared by solid-state reaction at 900 degrees C for 1 h. Prepared sample was characterized using powder X-ray diffraction, diffuse reflectance spectrum, and scanning electron microscopy. As-prepared Na16Ti10O28 sample is easily hydrated in water. Hydrous Na16Ti10O28 showed H-2 evolution without co-catalyst.

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  • Synthesis and Characterization of CaZnGe2O6

    Hirotoshi Hatakeyama, Yousuke Narumi, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato

    ELECTROCERAMICS IN JAPAN XIII   445   187 - +   2010

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    We report the synthesis and photocatalytic activity of CaZnGe2O6, which contains Ca2+ ions and one-dimensional GeO4 chains (Ge4+: d(10) electronic configuration). This sample demonstrated the water splitting phenomenon by loading with RuO2 cocatalysis. Moreover, Ln-doped CaZnGe2O6 (where Ln = La, Ce, Pr, Nd, or Sm) shows a higher photocatalytic activity than CaZnGe2O6.

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  • Photocatalytic Activity of Bismuth Layered Perovskite Treated with Acid

    Soihiro Watanabe, Yousuke Narumi, Kenji Toda, Tadashi Ihigaki, Kazuyoshi Uematsu, Mineo Sato

    ASIAN CERAMIC SCIENCE FOR ELECTRONICS III AND ELECTROCERAMICS IN JAPAN XII   421-422   554 - +   2010

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    We synthesized Sr0.7La0.2[ ](0.1)Bi2Ta2O9 (SBTL, [ ] vacancy), and measured their photocatalytic activity for water decomposition under UV light irradiation after acid treatment. They showed the high photocatalytic activity under UV light irradiation (H-2 evolution (213 mu mol / h), O-2 evolution (82 mu mol / h)).

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  • Low Temperature Synthesis of TiO2 from Acid Solution

    Soichiro Watanabe, Sae Nakajima, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato

    ASIAN CERAMIC SCIENCE FOR ELECTRONICS III AND ELECTROCERAMICS IN JAPAN XII   421-422   498 - +   2010

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    Fine TiO2 particles were synthesized from titanate precursor, Na16Ti10O28, dissolved in aqueous HNO3 solution. Crystalline rutile TiO2 powders were prepared by reflux of dissolved powders in the aqueous HNO3 solution under 100 degrees C. Prepared TiO2 powders were characterized by X-ray diffraction, thermogravimetry, scanning electron microscopy and BET specific surface area analysis.

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  • Synthesis and luminescence properties of non-doped long persistent phosphors : Mg2SnO4

    Akiko Torisaka, Hiroaki Kaneko, Kentaro Nomizu, Sho Abe, Tadashi Ishigaki, Kenji Toda, Kazuyoshi Uematsu, Mineo Sato

    ASIAN CERAMIC SCIENCE FOR ELECTRONICS III AND ELECTROCERAMICS IN JAPAN XII   421-422   352 - +   2010

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    A white long persistence phosphor was synthesized in a single-phase of Mg2SnO4 which was synthesized by a solid-state reaction. This phosphor crystallized in an inverse spinel structure and showed a broad-band emission from 350nm to 700nm. The afterglow was observed upon the excitation by 254nm. A Li-doped Mg2SnO4 sample showed a higher photoluminescence intensity and a longer lifetime than the non-doped one.

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  • Synthesis of Ce3+-Tb3+ co-activated phosphate phosphor in air condition.

    Natsuki Sato, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato

    IDW'10: PROCEEDINGS OF THE 17TH INTERNATIONAL DISPLAY WORKSHOPS, VOLS 1-3   1033 - 1035   2010

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    beta-SrP2O6:Ce3+, Tb3+ phosphor was synthesized by solid state reaction in air condition. Ce and Tb could be easily reduced without reduction gases. The phosphor emit strong green light under UV excitation around 300 nm. Since reduced gases flowing isn't necessary, this process is convenient and easy technique for the phosphor materials.

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  • Growth of Silicate Phosphors from the Vapor Phase

    Tadashi Ishigaki, Kenji Toda, Tatsuya Sakamoto, Kazuyoshi Uematsu, Mineo Sato

    IDW'10: PROCEEDINGS OF THE 17TH INTERNATIONAL DISPLAY WORKSHOPS, VOLS 1-3   1011 - 1013   2010

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    Well-crystalline Ba(2)Sia(4):Eu2+ powders were grown on a substrate by new vapor phase reaction between mixed powder (barium carbonate and europium oxide) and SiO gas. The vaporization of SiO was performed at 1400 - 1600 degrees C from the SiO2 source (or SiO powder) in reductive atmosphere. Formed SiO gas was transported by 95 vol% Ar- 5 vol% H-2 gas and reacted with raw material powders. The emission intensity of the Ba2SiO4:Eu2+ phosphor synthesized by new vapor phase technique is about 2.6 times higher than that of a conventional solid state reaction sample.

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  • Low temperature synthesis method of La2O2S2 and evaluation of the photocatalytic activity

    Mamoru Ohashi, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    ELECTROCERAMICS IN JAPAN XIII   445   217 - +   2010

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    Photocatalysts for overall water splitting have great potential in solar energy applications. A variety of photocatalysts have shown activity for water splitting. In particular, oxysulfides are the great interest because of their ability to generate H-2 and O-2 from water under visible light. However, they are generally synthesized under H2S flow, which is an extremely harmful gas for humans. In this study, La2O2S2 was synthesized at low temperature without H2S gas, and its photocatalytic activity was confirmed by hydrogen generation experiments.

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  • Synthesis and characterization of low-dimensional structure photocatalyst BaGeGa6O12

    Miki Nishiya, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato

    ELECTROCERAMICS IN JAPAN XIII   445   191 - +   2010

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    Low-dimensional structure compounds as layered perovskite shows high photocatalytic activity in water splitting. In this study, we investigated that synthesis and characterization of photocatalytic activity of BaGeGa6O12 with a one-dimensional structure. BaGeGa6O12 with loading 0.3wt% RuO2 showed a photocatalytic activity for water splitting into H-2 (70.6 mu mol / h) and O-2(28.1 mu mol / h).

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  • Novel Ba-Sc-Si-oxide and oxynitride phosphors for white LED

    Tomoyuki Nakano, Yoshitaka Kawakami, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato

    JOURNAL OF LUMINESCENCE   129 ( 12 )   1654 - 1657   2009.12

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    Alkaline earth silicates. which comprise a host material doped with rare-earth minerals, show excellent luminescence properties with various crystal structures and high stability. From results of this study, we report luminescence properties of Ba(9)Sc(2)Si(6)O(24):Eu(2+) and Ba(9)Sc(2+delta)Si(6)O(24+3 delta)N(3 delta):Eu(2+) as a novel alkaline earth silicate and silicon oxynitride phosphors for white LEDs Using a conventional solid-state reaction, Ba(9)Sc(2)Si(6)O(24):Eu(2+) samples were synthesized and Ba(9)Sc(2+delta)Si(6)O(24+3 delta)N(3 delta):Eu(2+) samples were obtained by nutrization of Ba(9)Sc(2+delta)Si(6)O(24):Eu(2+) The samples can be excited by blue light, exhibiting green (Ba(9)Sc(2)Si(6)O(24):Eu(2+)) and yellow (Ba(9)Sc(2+delta)Si(6)O(24+3 delta)N(3 delta):Eu(2+)) efficiently, which are emissions for use in white LEDs essentially. (C) 2009 Elsevier B.V. All rights reserved.

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  • Structure and luminescence of sodium and lanthanide(III) coordination polymers with pyridine-2,6-dicarboxylic acid

    Taoyun Zhu, Kazuya Ikarashi, Tadashi Ishigaki, Kazuyoshi Uematsu, Kenji Toda, Hirokazu Okawa, Mineo Sato

    INORGANICA CHIMICA ACTA   362 ( 10 )   3407 - 3414   2009.8

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    A series of coordination polymers constructed by sodium, lanthanide(III), and pyridine-2,6-dicarboxylate (dipic),NaLn(dipic)(2) center dot 7H(2)O (Ln = Eu, Gd, Tb), have been prepared under a hydrothermal condition. The crystal structures of the three compounds which are isostructual were determined by single-crystal X-ray diffraction. The two-dimensional layers found in the compounds are built up from six-folded {NaO6} polyhedra and nine-folded {LnN(2)O(7)} polyhedra, these being edge-shared each other along the c axis and bridged by carboxylate groups of dipic along the b axis, respectively. This two-dimensional framework provides cavities inside the layer and interlayer spaces outside the layer for accommodation of the two dipic molecules coordinated to a lanthanide(III) ions. The dehydrated materials obtained by heating the as-synthesized crystals at 200 degrees C held their crystal structure, and absorbed the same amounts of water molecules as those of the as-synthesized crystals upon the exposure of 100% relative humidity at room temperature. The Eu and Tb compounds showed strong red and green emissions, respectively, due to an energy transfer from dipic molecules to trivalent emission ions. (C) 2009 Elsevier B.V. All rights reserved.

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  • One-dimensional coordination polymers of praseodymium(III)-vanadium(V) complexes with pyridine-2,6-dicarboxylic acid

    Taoyun Zhu, Koichi Murokawa, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Hirokazu Okawa, Mineo Sato

    POLYHEDRON   28 ( 11 )   2196 - 2200   2009.7

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    This paper represents the hydrothermal synthesis of new isomorphous lanthanide-vanadium complexes with one-dimensional coordination polymers: [Pr-2(VO2)(2)(dipic)(4)(H2O)(9)] center dot nH(2)O with dipic = pyridine-2,6-dicarboxylic acid and n = 7.75. The structure determination shows a unique one-dimensional structure in which three types of chains run along the c-axis: the chain of positively charged praseodymium complexes bridged by a dipic ligand ([Pr(dipic)(H2O)5](+)), the chain of negatively charged, stacked vanadium complexes ([VO2(dipic)](-)), and the chain of neutral praseodymium complexes with a bridged dipic ligand and a coordinating dipic ligand ([Pr(dipic)[VO2(dipic)](H2O)(4)]). Such one-dimensional chains provide open channels which can accommodate water molecules. Not only accommodated water molecules but also ones coordinated to praseodymium ions were easily removed and absorbed upon heating at 200 degrees C and exposure of humidity at room temperature, respectively. (C) 2009 Elsevier Ltd. All rights reserved.

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  • One-dimensional channels constructed from hydrogen bonding networks among 4,4 '-bipyridine units and water molecules available for accommodation of polyoxomolybdate clusters

    Hidekazu Kobayashi, Kazuya Ikarashi, Kazuyoshi Uematsu, Kenji Toda, Hirokazu Okawa, Zhu Taoyun, Mineo Sato

    INORGANICA CHIMICA ACTA   362 ( 1 )   238 - 242   2009.1

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    A hybrid coordination complex, [(H5O2)(H(2)bpy)(bpy)(4)][NaMo8O26]center dot 2H(2)O (bpy = 4,4-bipyridine), was synthesized via hydrothermal reactions at 150 degrees C. The structure consists of two moieties; one is an infinite chain of beta-[Mo8O26] clusters, each of which is inter-linked up by a sodium ion, and the other a two-dimensional network constructed from doubly protonated bpy ions and its neutral molecules, which are linked with water molecules by hydrogen bonds. The stacking of the networks provides one-dimensional tunnels suitable for Na-beta-[Mo8O26] chains. (c) 2007 Published by Elsevier B.V.

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  • Melt synthesis of oxide red phosphors La2WO6:Eu3+

    Tadashi Ishigaki, Nobuhiro Matsushita, Masahiro Yoshimura, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    2008 INTERNATIONAL CONFERENCE ON LUMINESCENCE AND OPTICAL SPECTROSCOPY OF CONDENSED MATTER   2 ( 2 )   587 - 601   2009

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    To synthesize various complex oxide materials and their solid solutions, we have applied a novel "melt-synthesis technique" rather than conventional solid-state reaction techniques. The synthesis of well-crystalline multi-component phosphor materials is sometimes difficult using conventional solid-state reaction techniques because the reaction rates are slow as a result of slow mutual diffusion among solid-state species, thereby creating an inhomogeneous product. However, the melt reaction is rapid and homogeneous as it proceeds because of a solution reaction with fast diffusion. Red-phosphor La2WO6:Eu3+ samples with 25 mol% Eu3+ were prepared in a short time using melt synthesis. Red emission was observed at 618 nm typical for the Eu3+ center. Meltsynthesized samples exhibited much higher emission intensities than those obtained for the sample prepared using a solid-state reaction.

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  • Morphology Control of High Luminance Phosphors

    Kenji Toda, Masafumi Hosoume, Kenji Sato, Kazuyoshi Uematsu, Mineo Sato, Akira Watanabe, Takehisa Fukui

    ELECTROCERAMICS IN JAPAN XI   388   107 - +   2009

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    We report synthesis of well-grown blue phosphor powder, CaMgSi2O6:EU2+, from new vapor phase method (Flash creation method) derived nanopowder precursor. Single phase phosphor sample was obtained by post-annealing at 1100 degrees C. Luminescence properties were compared with that of the sample synthesized by a conventional solid state reaction. The post-annealed sample showed intense blue emission under UV excitation.

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  • Synthesis of phosphate phosphor for a white LED

    Ho Li Ngee, Tomoki Hatsumori, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato

    2008 INTERNATIONAL CONFERENCE ON LUMINESCENCE AND OPTICAL SPECTROSCOPY OF CONDENSED MATTER   2 ( 2 )   171 - 183   2009

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    The Eu2+-activated Sr2Mg3P4O15 (Sr2Mg3P4O15: Eu2+) phosphor is prepared using solid-state reactions of SrCO3, MgO, (NH4)(2)HPO4, and Eu2O3. The phosphor is excited efficiently by near-ultraviolet (n-UV) light irradiation, showing bright blue emission spectra at wavelengths of 400-550 nm with a maximum peak of 447 nm. The temperature dependence of luminescence intensity for (Sr0.94Eu0.06)(2)Mg3P4O15 is higher than that of commercial (Y, Gd)(3)Al5O12: Ce3+. In fact, Sr2Mg3P4O15: Eu2+ has high

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  • Reinvestigation of layered poly[aqua-sodium(I) [[aquasamarium(III)]-di-mu-aqua-mu(3)-pyridine-2,6-dicarboxylato-mu(2)-pyridine-2,6-dicarboxylato] trihydrate]

    Kazuya Ikarashi, Taoyun Zhu, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS   63   M2203 - U1635   2007.8

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    The crystal structure of the title compound, {[NaSm(C7H3- NO4)(2)(H2O)(4)]center dot 3H(2)O}(n), was first reported by van Albada, Gorter & Reedijk [(1999), Polyhedron, 18, 1821-1824]. It has now been reinvestigated and confirmed from single-crystal data, giving greater understanding of the role of the water molecules. The two-dimensional layers found in the compound are built up from six-coordinate NaO6 polyhedra and nine-coordinate SmN2O7 polyhedra. The former share edges with each other along the c axis and the latter are bridged by carboxylate groups of pyridine-2,6-dicarboxylate anions along the b axis. Eight-membered rings of water molecules, connected to one another by hydrogen bonding, are formed in the interlayer spaces.

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  • Solid chemical reaction by microwave heating for the synthesis of LiFePO4 cathode material

    Kazuyoshi Uematsu, Ayurni Ochiai, Kenji Toda, Mineo Sato

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   115 ( 1343 )   450 - 454   2007.7

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    LiFePO4 has been synthesized using FeC2O4 center dot 2H(2)O, LiOH center dot H2O and NH4H2PO4 as raw materials by a temperature controllable microwave heating oven. The products were characterized by X-ray diffraction, scanning electron microscope and electrochemical methods. Measurement of dielectric properties of individual raw materials and products at a constant microwave frequency revealed that the starting mixture preheated at 320 degrees C as well as added acetylene black were well microwave absorbers. Single phase olivin-type LiFePO4 with uniform and fine particle sizes was successfully synthesized by microwave heating at 350 degrees C in 15 min. The LiFePO4 cathode materials thus obtained had a higher discharge capacity and better cycle performance than those of the LiFePO4 sample by a conventional solid-state reaction.

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  • Electrochemical performance of Al-doped LiMn2O4 prepared by different methods in solid-state reaction

    Teruaki Kakuda, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    JOURNAL OF POWER SOURCES   167 ( 2 )   499 - 503   2007.5

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    Al-doped LiMn2O4 cathode materials synthesized by a newly developed wet-milling method and a dry process method using a conventional solid-state reaction were evaluated physicochemically and electrochemically. In the wet-milling method, a precursor was made from the raw materials atomized by a wet milling. A good cyclic performance was obtained for the LiMn2O4 samples prepared by the wet-milling method, achieved up to 99% of retention of capacity at 50 degrees C at the 30th cycle. The precursor obtained by the wet-milling method was well homogenous and highly reactive due to their finely ground particles, giving good crystallinity to LiMn2O4 products. (C) 2007 Published by Elsevier B.V.

    DOI: 10.1016/j.jpowsour.2007.01.035

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  • Superconductivity of layered perovskite synthesized by soft chemistry

    Takashi Teranishi, Sachi Takezawa, Kenji Toda, Hironori Ishikawa, Kenji Sato, Kazuyoshi Uematsu, Mineo Sato

    ELECTROCERAMICS IN JAPAN X   350   163 - +   2007

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    Reduced niobates, MLixCa2Nb3O10 (M = Rb, K and Na) and KNaxCa2Nb3O10 were synthesized by intercalation reaction with n-butyllithium or sodium azide. Rudd lesden-Popper type structure of sodium intercalation compound, KNaCa2Nb3O10, differ from that of the parent compound and lithium intercalation compound, KLiCa2Nb3O10. The magnetic susceptibility measurements showed that the sodium intercalation compound became superconductor with transition temperatures below 3.5 K. New lithium intercalation compound Na0.1Li0.8Ca2.45Nb3O10, for an ion exchange compound, Na0.1Ca2.45Nb3O10, with KCa2Nb3O10 type structure show the diamagnetic signals below 5 K.

    DOI: 10.4028/www.scientific.net/KEM.350.163

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  • Possibility of superconductivity in a layered perovskite niobate, KCa2Nb3O10, synthesized by an ion exchange reaction

    Sachi Takezawa, Takashi Teranishi, Hironori Ishikawa, Toshiaki Tokumitsu, Kenji Toda, Kazuyoshi Uematsu, Mineo Sato

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   114 ( 1334 )   861 - 865   2006.10

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    We prepared low temperature phase of triple layered perovksite KCa2Nb3O10 by an ion-exchange reaction. Li-intercalated low temperature phase, Li0.79KCa2M3O10, shows strong diamagnetic signal around at 7.8 K. The magnetic phase transition temperature of Li-intercalated low temperature phase is higher than that of Li-intercalated high temperature phase.

    DOI: 10.2109/jcersj.114.861

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  • New silicate phosphors for a white LED

    Kenji Toda, Yoshitaka Kawakami, Shin-ichiro Kousaka, Yutaka Ito, Akira Komeno, Kazuyoshi Uematsu, Mineo Sato

    IEICE TRANSACTIONS ON ELECTRONICS   E89C ( 10 )   1406 - 1412   2006.10

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    We focus on the development of new silicate phosphors for a white LED. In the europium doped silicate system, four LED phosphor candidates-Li2SrSiO4:Eu2+, Ba9Sc2Si6O24:Eu2+, Ca3Si2O7:Eu2+ and Ba2MgSi2O7:Eu2+ were found. Luminescent properties under near UV and visible excitation were investigated for the new Eu2+ doped LED silicate phosphors. These new phosphors have a relatively strong absorption band in a long wavelength region.

    DOI: 10.1093/ietele/e89-c.10.1406

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  • Powder neutron diffraction study of layered perovskite, KCa2Nb3O10

    Toshiaki Tokumitsu, Kenji Toda, Tsukuru Aoyagi, Daiki Sakuraba, Kazuyoshi Uematsu, Mineo Sato

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   114 ( 1333 )   795 - 797   2006.9

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    Crystal structure of a layered perovskite, KCa2Nb3O10, was determined by the Rietveld refinement method for a powder neutron diffraction pattern. The compound crystallizes a monoclinic system with a space group P2(1)/m (No. 11) and lattice parameters of a = 0.77418 (6) urn, b = 0.77073 (6) urn, c = 1.4859 (1) run, beta = 97.51 (1)degrees.

    DOI: 10.2109/jcersj.114.795

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  • Removal of fluoride from aqueous solution by ettringite

    Toshiaki Tokumitsu, Kenji Sato, Kenji Toda, Hiroko Morinaga, Kazuyoshi Uematsu, Mineo Sato

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   114 ( 1332 )   729 - 732   2006.8

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    In order to purify waste water containing fluoride, the calcium additive method has usually been used to recover fluoride ions in the form of refractory calcium fluoride. In this case, the removable fluoride concentration is limited to be 10-15 mg/l due to the solubility of calcium fluoride. In this study, we report 3CaO.Al2O3.3CaSO(4). 32H(2)O (ettringite) as a highly absorbent substance for the fluoride. The fluoride concentration of the water treated with the ettringite was achieved to be less than 8 mg/l without sludge.

    DOI: 10.2109/jcersj.114.729

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  • Development of an open-ended coaxial line probe for measurement of dielectric properties of inorganic materials at high temperature

    Kazuyoshi Uematsu, Jyunji Tsuchida, Mineo Sato, Kenji Toda

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   89 ( 8 )   2638 - 2640   2006.8

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    An open-ended coaxial line probe for dielectric measurements at high temperatures was developed. The probe, which was fabricated using stainless steel as the center and outer conductors and quartz wool as an insulator, can function well up to 800 degrees C. The dielectric properties of the raw materials and resultant materials were measured using a network analyzer that was equipped with the open-ended coaxial line probe at high temperatures to clarify the formation reaction process of YVO4:Eu3+ and Mg2SnO4:Mn2+ phosphors using a microwave heating method. The developed probe was confirmed to be effective for reaction-process analyses at high temperatures.

    DOI: 10.1111/j.1551-2916.2006.01074.x

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  • Luminescence properties of long-persistence silicate phosphors

    Yutaka Ito, Akira Komeno, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Journal of Alloys and Compounds   408-412   907 - 910   2006.2

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    Tb -doped and (Ce , Tb )-codoped Ca Sr Al SiO were prepared using a solid-state reaction at 1273 K for 3 h in air and 1623 K for 6 h in a weakly reductive atmosphere of 5% H -95% N gas. The resultant (Ce , Tb )-codoped Ca Sr Al SiO phosphor shows four main emission peaks: one at 386 nm for Ce and three at 483, 542 and 591 nm for Tb . Emission intensity of Tb in the (Ce , Tb )-codoped phosphor was five times greater than that of the Tb single-doped phosphor because of the energy transfer from Ce to Tb . The codoped phosphor showed long-persistence white phosphorescence. © 2005 Elsevier B.V. All rights reserved. 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 0.5 1.5 2 7 2 2 0.5 1.5 2 7

    DOI: 10.1016/j.jallcom.2005.01.132

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  • VUV properties of Eu-doped alkaline earth magnesium silicate

    Akira Komeno, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato

    Journal of Alloys and Compounds   408-412   871 - 874   2006.2

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    Plasma display panels (PDP) are most promising for large flat panel displays at present. However, luminescence efficiency and lifetime of PDP phosphors should be improved. Alkaline earth silicates show remarkable properties as phosphor hosts with various crystal structures and high chemical stability. Availability of Ba MgSi O has received attention as a host for vacuum ultraviolet (VUV) excitable phosphor. Blue-green phosphor Ba MgSi O :Eu with a high thermal quenching temperature [G. Blasse, W.L. Wanmaker, J.W. ter Vrugt, A. Bril, Philips. Res. Rep. 23 (1968) 189-200] exhibit high luminance (45% of commercial green VUV phosphor Zn SiO :Mn ) under VUV excitation without optimization of synthesis condition and emission color. Ba MgSi O is promising candidate for the new VUV phosphor in PDP and mercury-free lamp application. © 2005 Elsevier B.V. All rights reserved. 2 2 7 2 2 7 2 4 2 2 7 2+ 2+

    DOI: 10.1016/j.jallcom.2005.01.070

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  • Self assemble synthesis of potassium niobate at room temperature

    Kenji Toda, Akira Sugawara, Kazuyoshi Uematsu, Mineo Sato, Minoru Osada

    ELECTROCERAMICS IN JAPAN IX   320   7 - 10   2006

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    Nanoparticles and thin films of potassium niobate KNbO3 were prepared using a unique solution reaction at room temperature. Precursor solutions and as-prepared samples were characterized by Raman spectroscopy. The data demonstrated that the niobate nanosheets consist of distorted Nb-O polyhedra.

    DOI: 10.4028/www.scientific.net/KEM.320.7

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  • Synthesis of nitride compound using fluidized bed

    Yoshiomi Yamanaka, Kenji Toda, Kazuyoshi Uematsu, Mineo Sato, Noriyasu Hotta

    Transactions of the Materials Research Society of Japan, Vol 30, No 4   30 ( 4 )   1089 - 1092   2005

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    Compositionally uniformed nitride powders (GaN and GaN-ZnO solid solution) were synthesized from metal oxide powders using a fluidized bed in a NH3 and/or a N-2 flow. GaN was synthesized by a two-step heating; the first step was done at 700 degrees C for 1 h, and the second step was done at 900 degrees C for 4h. A GaN-ZnO solid solution was synthesized at 900 degrees C for 4h. The synthesized nitride powders were characterized by powder X-ray diffraction (XRD). Optical properties of the products were examined by UV-Vis diffuse reflectance spectra. The grain size of the products was smaller than that of the starting materials. On the other hand, the crystallite size of the GaN-ZnO solid solution was almost the same as that of the starting material of Ga2O3.

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  • Structure analysis of A-site defect perovskite-type crystal

    Akira Komeno, Yoshio Aoyama, Kenji Toda, Mineo Sato, Kazuyoshi Uematsu

    Key Engineering Materials   269   11 - 14   2004

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    A-site deficient perovskite, Y (Ta W )O with was determined by the Rietveld refinement method from neutron diffraction data. Y Ta W O is an A-site ordered monoclinic symmetry. The space group of Y Ta W O is C2/c (No.15) and lattice parameters of a = 0.764(1) nm, b = 0.764(1) nm, c = 0.763(1) nm and β= 90.36°. 0.22 0.66 0.34 3 0.22 0.66 0.34 3 0.22 0.66 0.34 3

    DOI: 10.4028/www.scientific.net/kem.269.11

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  • 白色LED用新規蛍光体の開発—第56回秋期講演大会 : 優秀発表賞受賞論文と受賞者の感想 ; 第56回秋期講演大会 優秀論文

    樋口 祐哉, 上松 和義, 戸田 健司, 佐藤 峰夫

    日本電子材料技術協会会報 = Bulletin of Japan Electronic Materials Society / 日本電子材料技術協会 編   51   33 - 36   2020.12

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  • サイトエンジニアリング現象を用いた白色LED用蛍光体の開発—第55回秋期講演大会 : 優秀発表賞受賞論文と受賞者の感想 ; 第55回秋期講演大会 優秀論文

    岩城 将人, 小野寺 瑞穂, 上松 和義, 戸田 健司, 佐藤 峰夫

    日本電子材料技術協会会報 = Bulletin of Japan Electronic Materials Society / 日本電子材料技術協会 編   50   39 - 41   2019.11

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  • 新奇なソフト化学であるWASSR法の展開—Research and Development of Novel Soft Chemistry, WASSR Method—特集 低温合成堆積技術

    戸田 健司, 渡邊 大, 星 司, 山梨 僚太, 上松 和義, 佐藤 峰夫

    Ceramics Japan = セラミックス : bulletin of the Ceramic Society of Japan   54 ( 8 )   569 - 572   2019.8

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  • 集光炉を用いた新規緑色蛍光体SrCa₂Lu₁₀O₁₈:Ce³⁺の合成—第54回秋期講演大会 : 優秀発表賞受賞論文と受賞者の感想 ; 第54回秋期講演大会 優秀論文

    勝 峰徳, 長谷川 拓哉, 上松 和義, 戸田 健司, 佐藤 峰夫

    日本電子材料技術協会会報 = Bulletin of Japan Electronic Materials Society / 日本電子材料技術協会 編   49   30 - 33   2018.11

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  • ポリテトラフルオロエチレンをフッ化剤としたNaイオン二次電池用鉄系正極材料の合成および電気化学特性—第53回秋期講演大会 : 優秀発表賞受賞論文と受賞者の感想

    津浦 篤司, 長谷川 拓哉, 鳥井 弘渉, 金 善旭, 上松 和義, 戸田 健司, 佐藤 峰夫

    日本電子材料技術協会会報 = Bulletin of Japan Electronic Materials Society / 日本電子材料技術協会 編   48   29 - 32   2017.11

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  • アークイメージング炉を用いたガラス蛍光体の合成—第52回秋期講演大会 : 優秀発表賞受賞論文と受賞者の感想

    長谷川 拓哉, 武藤 雅, 中川 博子, 金 善旭, 上松 和義, 戸田 健司, 佐藤 峰夫

    日本電子材料技術協会会報 = Bulletin of Japan Electronic Materials Society / 日本電子材料技術協会 編   47   53 - 56   2016.11

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  • 新規Ce³⁺賦活蛍光体の合成および発光波長の制御—第52回秋期講演大会 : 優秀発表賞受賞論文と受賞者の感想

    熊谷 翔太, 長谷川 拓哉, 金 善旭, 上松 和義, 戸田 健司, 佐藤 峰夫

    日本電子材料技術協会会報 = Bulletin of Japan Electronic Materials Society / 日本電子材料技術協会 編   47   61 - 64   2016.11

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  • 真空加圧焼成炉VESTAを用いた高純度窒化物蛍光体の合成—Synthesis of High Purity Nitride Phosphor Using a VESTA Vacuum-Pressure Sintering Furnace

    山梨 遼太, 長谷川 拓哉, 金 善旭, 上松 和義, 戸田 健司, 佐藤 峰夫, 小向 孝宗

    島津評論 / 島津評論編集部 [編]   73 ( 1・2 )   89 - 95   2016

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  • PTFEを用いたMF₃(M=V,Fe)型フッ化物電極材料の合成—第51回秋期講演大会 : 優秀賞受賞論文と受賞者の感想

    鳥井 弘渉, 金 善旭, 上松 和義, 石垣 雅, 戸田 健司, 佐藤 峰夫

    日本電子材料技術協会会報 = Bulletin of Japan Electronic Materials Society / 日本電子材料技術協会 編   46   51 - 54   2015.11

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  • 新規低温合成法によるセラミックス材料の合成—第51回秋期講演大会 : 優秀賞受賞論文と受賞者の感想

    金 善旭, 兼子 達朗, 猪井 潤, 上松 和義, 戸田 健司, 佐藤 峰夫, 小出 順子, 戸田 雅子, 工藤 嘉昭

    日本電子材料技術協会会報 = Bulletin of Japan Electronic Materials Society / 日本電子材料技術協会 編   46   55 - 58   2015.11

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  • Structure Analysis of Mg-substituted LiSrPO<sub>4</sub>:Eu<sup>2+ </sup>Phosphors

    Kamei Shinnosuke, Ishigaki Tadashi, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    SPring-8/SACLA Research Report   3 ( 2 )   336 - 339   2015.7

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    DOI: 10.18957/rr.3.2.336

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  • 気相合成法によるケイ酸塩蛍光体単結晶の作成および構造解析—Growth and structural analysis of silicate phosphor single crystal using gas phase method—電子ディスプレイ

    長谷川 翔太, 金 善旭, 上松 和義

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 408 )   17 - 20   2014.1

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  • 白色LED用新規ケイ酸塩蛍光体の合成および特性評価—Synthesis and the luminescence Property of Novel Silicate Phosphors for White LEDs—情報ディスプレイ

    杉本 和磨, 金 善旭, 上松 和義

    映像情報メディア学会技術報告 = ITE technical report   38 ( 2 )   81 - 83   2014.1

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  • ソフトケミカルな手法による酸化物発光液晶材料の合成—Synthesis of emissive oxide liquid crystal material by a soft-chemical process—電子ディスプレイ

    渡邉 美寿貴, 上松 和義, 金 善旭

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 408 )   61 - 64   2014.1

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  • 新規青色蛍光体Sr₆Y₂Al₄O₁₅:Ce³⁺の合成および特性評価—Synthesis and Luminescence Properties of Novel Blue-emitting Sr₆Y₂Al₄O₁₅:Ce³⁺ Phosphors—情報ディスプレイ

    河野 ゆかり, 関 康平, 上松 和義

    映像情報メディア学会技術報告 = ITE technical report   38 ( 2 )   5 - 8   2014.1

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  • 新規青色蛍光体Sr₆Y₂Al₄O₁₅:Ce³⁺の合成および特性評価—Synthesis and Luminescence Properties of Novel Blue-emitting Sr₆Y₂Al₄O₁₅:Ce³⁺ Phosphors—電子ディスプレイ

    河野 ゆかり, 関 康平, 上松 和義

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 408 )   5 - 8   2014.1

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  • 気相合成法によるケイ酸塩蛍光体単結晶の作成および構造解析—Growth and structural analysis of silicate phosphor single crystal using gas phase method—情報ディスプレイ

    長谷川 翔太, 金 善旭, 上松 和義

    映像情報メディア学会技術報告 = ITE technical report   38 ( 2 )   17 - 20   2014.1

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  • ソフトケミカルな手法による酸化物発光液晶材料の合成—Synthesis of emissive oxide liquid crystal material by a soft-chemical process—情報ディスプレイ

    渡邉 美寿貴, 上松 和義, 金 善旭

    映像情報メディア学会技術報告 = ITE technical report   38 ( 2 )   61 - 64   2014.1

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  • 白色LED用新規ケイ酸塩蛍光体の合成および特性評価—Synthesis and the luminescence Property of Novel Silicate Phosphor for White LEDs—電子ディスプレイ

    杉本 和磨, 金 善旭, 上松 和義

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 408 )   81 - 83   2014.1

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  • Inorganic Phosphor Preparation at Room Temperature

    Ishigaki Tadashi, Kamei Shinnosuke, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    SPring-8/SACLA Research Report   1 ( 2 )   77 - 79   2013.6

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    DOI: 10.18957/rr.1.2.77

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  • Structure Analysis of Rare Earth Free Phosphors Synthesized at Room Temperature

    Ishigaki Tadashi, Kamei Shinnosuke, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    SPring-8/SACLA Research Report   1 ( 2 )   80 - 82   2013.6

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    DOI: 10.18957/rr.1.2.80

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  • Stabilization conditions for Ce^<3+> in oxide phosphors

    KIKUCHI Takumi, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, TODA Kenji, SATO Mineo

    ( 62 )   38 - 39   2013.5

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  • 希土類含有MOF化合物の構造解析および水素吸蔵特性

    三浦 和宏, 上松 和義, 石垣 雅, 戸田 健司, 佐藤 峰夫

    希土類 = Rare earths   ( 62 )   128 - 129   2013.5

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  • 希土類元素の使用低減化を目指した青色蛍光体の開発—特集 高機能材料の創成と実用化

    佐藤 峰夫, 石垣 雅, 上松 和義

    ケミカルエンジニヤリング = Chemical engineering   57 ( 11 )   830 - 834   2012.11

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  • Synthesis of novel phosphate blue phosphor

    KANEKO Hirofumi, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, TODA Kenji, SATO Mineo

    ( 60 )   64 - 65   2012.5

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  • Synthesis of Ce<3+> doped compound oxide phosphor in air

    KIKUCHI Takumi, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, TODA Kenji, SATO Mineo

    ( 60 )   60 - 61   2012.5

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  • Synthesis and Luminescence Property of Eu^<2+>-activated Phosphate Phosphor

    KAMEI Shinnosuke, HASEGAWA Takuya, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, TODA Kenji, SATO Mineo

    ( 60 )   62 - 63   2012.5

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  • Synthesis method of rare earth phosphors using silicon monoxide as a reductive agent

    TODA Kenji, ABE Takeshi, SAKAMOTO Tatsuya, KAMEI Shinnosuke, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, SATO Mineo

    ( 60 )   138 - 139   2012.5

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  • 仕事と趣味と……放射線管理

    上松 和義, 古田 悦子

    Isotope news   ( 697 )   67 - 69   2012.5

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  • Novel synthesis techniques of LED phosphors using silicon monoxide

    Toda Kenji, Sakamoto Tatsuya, Ishigaki Tadashi, Kamei Shinnosuke, Uematsu Kazuyoshi, Sato Mineo, Toda Masako, Koide Junko, Kudo Yoshiaki

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2012S   682 - 682   2012

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    DOI: 10.14853/pcersj.2012s.0.682.0

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  • Diffusion mechanism of thin-film multi layer of AlN/Ti/Pt/Au/(Ti/Ag/Sn)

    Nagano Yukio, Uematsu Kazuyoshi, Ohta Masatoshi

    Proceedings of JIEP Annual Meeting   26   179 - 182   2012

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    DOI: 10.11486/ejisso.26.0_179

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  • Synthesis of rare earth phosphors using silicon monoxide raw material

    TODA Kenji, SAKAMOTO Tatsuya, ISHIGAKI Tadashi, UEMATSU Kazuyoshi, SATO Mineo

    ( 58 )   76 - 77   2011.5

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  • Microwave synthesis of SrAl_2O_4:Eu,Dy and valence study of Eu

    ISHIGAKI Tadashi, SHIMIZU Hiroyuki, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    ( 58 )   68 - 69   2011.5

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  • Synthesis and properties of new MOF compounds containing rare earths, transition metals and 2,5-pyridine-dicarboxylic acid

    HIRAYAMA Youhei, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, TODA Kenji, SATO Mineo

    ( 58 )   96 - 97   2011.5

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  • 無機発光材料の開発動向—特集 有機EL材料--技術動向と今後の展望

    戸田 健司, 石垣 雅, 上松 和義

    工業材料 = Engineering materials   59 ( 4 )   34 - 38   2011.4

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  • Diffusion mechanism of thin-film multi layer of AlN submount

    Nagano Yukio, Nakashima Kensaku, Oota Masatoshi, Uematsu Kazuyoshi

    Proceedings of JIEP Annual Meeting   25   241 - 244   2011

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    DOI: 10.11486/ejisso.25.0_241

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  • Investigation of new precursors for nanosheet phosphors

    TAMIMA KOUDAI, WATANABE MIZUKI, IMANARI YUICHIRO, KAMEI SHINNOSUKE, UEMATSU KAZUYOSHI, ISHIGAKI TADASHI, TODA KENJi, SATO MINEO

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2011F   164 - 164   2011

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    DOI: 10.14853/pcersj.2011f.0.164.0

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  • Luminescence property of Na2Ti(Si1-xGex)O5

    TANIMA KOUDAI, KAMEI SHINNOSUKE, UEMATSU KAZUYOSHI, ISHIGAKI TADASHI, TODA KENJI, SATO MINEO

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2011F   268 - 268   2011

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    DOI: 10.14853/pcersj.2011f.0.268.0

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  • Luminescence properties of Bi3+ ions in the layered perovskites

    Toda Kenji, Ishigaki Tadashi, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2011S   224 - 224   2011

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    DOI: 10.14853/pcersj.2011s.0.224.0

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  • New raw material "Silicon monoxide" for the synthesis of phosphors

    Toda Kenji, Sakamoto Tatsuya, Kamei Shinnosuke, Ishigaki Tadashi, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2011F   48 - 48   2011

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    DOI: 10.14853/pcersj.2011f.0.48.0

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  • Synthesis of silicate phosphors for white LEDs

    TODA Kenji, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, SATO Mineo

    ( 56 )   68 - 69   2010.5

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  • Synthesis and characterization of long persistence phosphor CaGe_2O_5:La

    SHIMIZU Hiroyuki, ISHIGAKI Tadashi, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    ( 56 )   72 - 73   2010.5

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  • Development of novel blue phosphor of KMBP_2O_8:Eu^<2+>(M = Sr, Ba) for white light LEDs

    SATO Natsuki, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, TODA Kenji, SATO Mineo

    ( 56 )   70 - 71   2010.5

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  • Synthesis and properties of MOF compound with rare earth elements and 2,4-PDC

    MATSUMURA Ryosuke, SATO Yoshiyuki, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, TODA Kenji, SATO Mineo

    ( 56 )   34 - 35   2010.5

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  • 変換効率の高い新しい蛍光体の開発トレンド—Research and development trend of new LED phosphors—マテリアルフォーカス:オプトロニクス LED照明用の蛍光体材料の開発トレンド

    戸田 健司, 石垣 雅, 上松 和義

    Material stage / 技術情報協会 編   10 ( 1 )   61 - 65   2010.4

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  • ナノ粒子蛍光体(特集 ナノクリスタルセラミックスの新展開)

    セラミックス   45 ( 2 )   109 - 112   2010.2

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  • Synthesis of iron oxide nanoparticles by hydrothermal method with sodium salicylate as ligand

    Mizushina Hitomi, Uematsu Kazuyoshi, Ishigaki Tadashi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2010S   3L23 - 3L23   2010

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    DOI: 10.14853/pcersj.2010s.0.3l23.0

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  • Research for novel silicate phosphors for white LEDs

    Sato Kenji, Ishigaki Tadashi, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2010S   2H05 - 2H05   2010

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    DOI: 10.14853/pcersj.2010s.0.2h05.0

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  • Luminescent properties of a new long-lasting phosphor Sr<SUB>2</SUB>SnO<SUB>4</SUB>:Sm<SUB>3+</SUB>

    henmi kazuya, ishigaki tadashi, uematsu kazuyoshi, toda kenji, satou mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2010S   1H23 - 1H23   2010

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    DOI: 10.14853/pcersj.2010s.0.1h23.0

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  • Synthesis of aluminate phosphors for white LEDs

    HATSUMORI Tomoki, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, TODA Kenji, SATO Mineo

    ( 54 )   148 - 149   2009.5

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  • Synthesis of phosphate phosphors for white LEDs

    SATO Natsuki, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, TODA Kenji, SATO Mineo

    ( 54 )   150 - 151   2009.5

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  • Novel Ba-Sc-Si-oxide and oxynitride phosphors for a white LED

    NAKANO T., KAWAKAMI Y., UEMATSU K., ISHIGAKI T., TODA K.

    ( 54 )   146 - 147   2009.5

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  • Synthesis and properties of MOF compound containing rare earth using 2,4-PDC

    SATO Yoshiyuki, ZHU Taoyun, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, TODA Kenji, SATO Mineo

    ( 54 )   206 - 207   2009.5

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  • Long persistence properties of Ca_2SnO_4 doped with Sm

    NOMIZU Kentaro, ISHIGAKI Miyabi, TORISAKA Akiko, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    ( 54 )   154 - 155   2009.5

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  • Synthesis of novel silicate phosphor for a white LED

    INOUE Michiyo, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, TODA Kenji, SATO Mineo

    ( 54 )   144 - 145   2009.5

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  • Luminescence property of vanadate-phosphate phosphors activated with rare earths

    TODA Ayano, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, TODA Kenji, SATO Mineo

    ( 54 )   152 - 153   2009.5

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  • Development of novel aluminate phosphor for a white LED

    Sakamoto Tatsuya, Uematsu Kazuyoshi, Ishigaki Tadashi, Toda Kenji, Sato Nimeo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2009F   1PO11 - 1PO11   2009

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    DOI: 10.14853/pcersj.2009f.0.1po11.0

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  • Synthesis of new pyroxene-type type phosphor

    Toda Ayano, Uematsu Kazuyoshi, Ishigaki Tadashi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2009F   1PO13 - 1PO13   2009

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    DOI: 10.14853/pcersj.2009f.0.1po13.0

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  • Research for novel phosphate phosphors

    Ishigaki Tadashi, Seki Satomi, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2009S   117 - 117   2009

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    DOI: 10.14853/pcersj.2009s.0.117.0

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  • Room temperature Synthesis of vanadate phosphors

    Toda Ayano, Ishigaki Tadashi, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2009S   116 - 116   2009

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    DOI: 10.14853/pcersj.2009s.0.116.0

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  • Synthesis of Eu<SUP>2+</SUP> doped Gillespite related alkaline-earth silicate phosphor

    Inoue Michiyo, Uematsu Kazuyoshi, Ishigaki Tadashi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2009F   1PO07 - 1PO07   2009

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    DOI: 10.14853/pcersj.2009f.0.1po07.0

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  • Synthesis of beta SrP<SUB>2</SUB>O<SUB>6</SUB> phosphor

    Sato Natsuki, Uematsu Kazuyoshi, Ishigaki Tadashi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2009F   1PO06 - 1PO06   2009

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    DOI: 10.14853/pcersj.2009f.0.1po06.0

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  • Low temperature synthesis of rutile TiO2 from Na16Ti10O28 as precursor

    fukushi keiko, nakajima sae, uematsu kazuyoshi, ishigaki tadashi, toda kenji, sato mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2009F   1PO12 - 1PO12   2009

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    DOI: 10.14853/pcersj.2009f.0.1po12.0

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  • Synthesis and characterization of low-dimensional structure photocatalyst

    Nishiya Miki, Uematsu Kazuyoshi, Ishigaki Tadashi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2009F   1PO10 - 1PO10   2009

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    DOI: 10.14853/pcersj.2009f.0.1po10.0

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  • Synthesis and characterization of rare earth ion doped long persistence phosphors that include tin

    NOMIZU Kentaro, TORISAKA Akiko, UEMATSU Kazuyosi, TODA Kenji, SATO Mineo

    ( 52 )   118 - 119   2008.5

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  • Synthesis of new aluminosilicate phosphor for a white LED

    SEKI Satomi, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, TODA Kenji, SATO Mineo

    ( 52 )   122 - 123   2008.5

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  • Synthesis and properties of inorganic-organic compound with Eu and Tb

    SATO Yoshiyuki, ZHU Taoyun, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    ( 52 )   96 - 97   2008.5

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  • Synthesis and characterization of new alkaline earth silicate phosphors

    TODA Kenji, KAWAKAMI Yoshitaka, SATO Kenji, UEMATSU Kazuyoshi, ISHIGAKI Tadashi, SATO Mineo

    ( 52 )   104 - 105   2008.5

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  • Synthesis of Silicate Phosphors using Asbestos Slate as a Raw Material

    Shirakura Shigeki, Toda Kenji, Uematsu Kazuyoshi, Ishigaki Tadashi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008F   314 - 314   2008

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    DOI: 10.14853/pcersj.2008f.0.314.0

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  • New synthesis method of green emitting oxysulfides phosphor

    ohashi mamoru, uematsu kazuyoshi, ishigaki tadashi, toda kenji, sato mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008F   311 - 311   2008

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    DOI: 10.14853/pcersj.2008f.0.311.0

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  • Synthesis of novel alminosilicate phosphor for a white LED

    Seki Satomi, uematsu kazuyoshi, ishigaki tadashi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008F   304 - 304   2008

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    DOI: 10.14853/pcersj.2008f.0.304.0

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  • Hydrothermal synthesis of Li<SUB>2</SUB>FeSiO<SUB>4</SUB>

    Toriyama Takahiro, Uematsu kazuyoshi, Toda kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008S   2P110 - 2P110   2008

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    DOI: 10.14853/pcersj.2008s.0.2p110.0

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  • Preparation of KNbO3 thin film at room temperature

    Takahashi Toshinari, Sugawara Akira, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008S   2P027 - 2P027   2008

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    DOI: 10.14853/pcersj.2008s.0.2p027.0

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  • Synthesis of novel alkaline earth silicate phosphor for a white LED

    Toda Kenji, Kawakami Yoshitaka, Sato Kenji, Hosoume Masafumi, Uematsu Kazuyoshi, Ishigaki Tadashi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008S   2P057 - 2P057   2008

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    DOI: 10.14853/pcersj.2008s.0.2p057.0

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  • Synthesis and Luminescence Property of Blue Phosphor, BaMgAl<SUB>10</SUB>O<SUB>17</SUB>:Eu<SUP>2+</SUP>, by the Flash-Creation-Method

    WATANABE Akira, FUKUI Takehisa, NOGI Kiyoshi, TODA Kenji, KAWADA Satoshi, SHIRAKURA Shigeki, HOSOUME Masafumi, UEMATSU Kazuyoshi, SATO Mineo

    Journal of High Temperature Society   34 ( 3 )   130 - 135   2008

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    BaMgAl<SUB>10</SUB>O<SUB>17</SUB>:Eu<SUP>2+</SUP> is a promising blue phosphor for lump, CRT and PDP. Conventionally, the BAM phosphors synthesize by the solid-state reaction from the mixture of oxide or carbonate starting materials. The solid-state reaction needs high temperature to get well-crystallized single phase. However, the control of particle morphology and size distribution is difficult for such a high temperature synthesis. In this study, we reported new synthetic technique using flash creation method derived nanopowder precursor. In the new technique, well-crystallized single phase phosphors were obtained at 1400°C for 6h. Although the powders were grown into the plate-like particles, the BAM powders retain the nano-size morphology after annealing. The emission intensity under UV excitation of Ba<SUB>0.9</SUB>Eu<SUB>0.1</SUB>MgAl<SUB>10</SUB>O<SUB>17</SUB> from the FCM-derived nanopowder was 110% compared with phosphors prepared by the conventional solid-state reaction. The excitation intensity under VUV (146nm) of the FCM derived nanopowder was 159% of the conventional solid-state reaction.

    DOI: 10.7791/jhts.34.130

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  • Low temperature synthesis of TiO2 from NaLnTiO4

    nakajima sae, yamanaka yoshiomi, uematsu kazuyoshi, ishigaki tadashi, toda kenji, sato mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008F   312 - 312   2008

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    DOI: 10.14853/pcersj.2008f.0.312.0

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  • The synthesis and characterization of long lasting phosphorescence for Mg<SUB>2</SUB>SnO<SUB>4</SUB> system substituted other element for Mg or Sn .

    Kaneko Hiroaki, Ishigaki Tadashi, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008F   259 - 259   2008

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    DOI: 10.14853/pcersj.2008f.0.259.0

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  • Novel Ba-Sc-Si-oxide and oxynitride phosphors for a white LED

    Nakano Tomoyuki, Kawakami Yoshitaka, Komeno Akira, Uematsu Kazuyoshi, Ishigaki Tadashi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008F   306 - 306   2008

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    DOI: 10.14853/pcersj.2008f.0.306.0

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  • Synthesis of phosphate phosphor for a white LED

    Hatsumori Tomoki, Ho Li Ngee, Uematsu Kazuyoshi, Ishigaki Tadashi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008F   305 - 305   2008

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    DOI: 10.14853/pcersj.2008f.0.305.0

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  • Low temperature synthesis of TiO2 from acid solution

    Nakajima Sae, Watanabe Soichiro, Yamanaka Yoshiomi, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008S   2P094 - 2P094   2008

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    DOI: 10.14853/pcersj.2008s.0.2p094.0

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  • Development of novel phosphor for LED

    Toda Kenji, Kawakami Yoshitaka, Komeno Akira, Uematsu Kazuyoshi, Ishigaki Tadashi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008S   2P059 - 2P059   2008

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    DOI: 10.14853/pcersj.2008s.0.2p059.0

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  • Synthesis of long persistence phosphor Mg2SnO4 by single-mode microwave heating method

    Hasegawa Yu, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008S   1I19 - 1I19   2008

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    DOI: 10.14853/pcersj.2008s.0.1i19.0

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  • Synthesis of LiMn<SUB>0.5</SUB>Ni<SUB>0.5</SUB>O<SUB>2</SUB> by using binuclearcomplex [Mn(C<SUB>4</SUB>N<SUB>3</SUB>H<SUB>5</SUB>)<SUB>2</SUB>][NiCl<SUB>4</SUB>] as a precursor.

    Takano Mikihiro, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008S   2P152 - 2P152   2008

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    DOI: 10.14853/pcersj.2008s.0.2p152.0

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  • Electrochemical properties of LiCrMnO<sub>4</sub> for a cathode material in lithium ion batteries.

    Takano Mikihiro, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008F   545 - 545   2008

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    DOI: 10.14853/pcersj.2008f.0.545.0

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  • Application of layered tantalum oxides nanosheet to photocatalytic reaction

    Mori Yoshiyuki, Kibe Hidetoshi, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008S   2P096 - 2P096   2008

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    DOI: 10.14853/pcersj.2008s.0.2p096.0

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  • Effects of selective leaching of bismuth oxide sheets in Sillen-Aurivillius family on their photocatalytic activities

    Hatakeyama Hirotoshi, Uematsu Kazuyoshi, Ishigaki Tadashi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008F   29 - 29   2008

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    DOI: 10.14853/pcersj.2008f.0.29.0

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  • New synthesis method of nitride phosphor for a white LED

    Nakano Tomoyuki, Sato Kenji, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo, Shimomura Yasuo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008S   2P052 - 2P052   2008

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    DOI: 10.14853/pcersj.2008s.0.2p052.0

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  • Effects of selective leaching of bismuth oxide sheets in Bi4TaO8Cl on its photocatalystic activity

    Hatakeyama Hirotoshi, Narumi Yousuke, Ishikawa Hironori, Uematsu Kazuyoshi, Toda Kenji, Satou Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008S   2P097 - 2P097   2008

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    DOI: 10.14853/pcersj.2008s.0.2p097.0

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  • Synthesis and Photocatalytic Property of Alkali (Oxy)nitride

    Narumi Yousuke, Ishikawa Hironori, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008S   2P098 - 2P098   2008

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    DOI: 10.14853/pcersj.2008s.0.2p098.0

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  • Low temperature synthesis of oxysulfides

    Ohashi Mamoru, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008S   2P099L - 2P099L   2008

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    DOI: 10.14853/pcersj.2008s.0.2p099l.0

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  • Luminescent properties of new green long lasting phosphor, Ca<SUB>3</SUB>SnSi<SUB>2</SUB>O<SUB>9</SUB> :Tb<SUP>3+</SUP>.

    Nomizu Kentaro, Torisaka Akiko, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008S   2P066 - 2P066   2008

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    DOI: 10.14853/pcersj.2008s.0.2p066.0

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  • Synthesis of c-axis oriented KNbO3 ceramics

    Takahashi Toshinari, iida akihiro, uematsu kazuyoshi, ishigaki tadashi, toda kenji, sato mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008F   283 - 283   2008

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    DOI: 10.14853/pcersj.2008f.0.283.0

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  • Synthesis of blue-emitting phosphate phosphors for a white LED

    Hatsumori Tomoki, Ho Li Ngee, Toda Kenji, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008S   2P065 - 2P065   2008

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    DOI: 10.14853/pcersj.2008s.0.2p065.0

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  • Research for novel borate phosphor

    Toda Kenji, Nakahara Myuji, Uematsu Kazuyosi, Ishigaki Tadashi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008S   2P058 - 2P058   2008

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    DOI: 10.14853/pcersj.2008s.0.2p058.0

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  • Luminescent properties of red long persistent phosphor, Ca<SUB>2</SUB>SnO<SUB>4</SUB> doped with Eu<SUP>3+</SUP>

    Nomizu Kentaro, Torisaka Akiko, Uematsu Kazuyoshi, Ishigaki Tadashi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2008F   303 - 303   2008

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    DOI: 10.14853/pcersj.2008f.0.303.0

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  • Morphology Control of Phosphor Materials using Flash Creation Method

    TODA Kenji, MATSUMOTO Takako, KAWAKAMI Yoshitaka, KOUSAKA Shin-ichiro, HOSOUME Masafumi, UEMATSU Kazuyoshi, SATO Mineo, WATANABE Akira, FUKUI Takehisa

    ( 50 )   132 - 133   2007.5

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  • Development of novel green phosphor for a white LED

    KAWAKAMI Yoshitaka, KOMENO Akira, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    ( 50 )   146 - 147   2007.5

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  • Luminescent properties of red long persistent phosphors, BaMg_2Si_2O_7 doped with Eu^<2+> and Mn^<2+>

    TORISAKA Akiko, ABE Sho, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    ( 50 )   144 - 145   2007.5

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  • Synthesis and structure of novel organic/inorganic hybrid material with rare earth and vanadium frameworks

    MUROKAWA Koichi, IKARASHI Kazuya, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    ( 50 )   168 - 169   2007.5

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  • Development of novel red phosphor

    SEKI Satomi, ITO Yutaka, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    ( 50 )   148 - 149   2007.5

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  • 100℃以下での酸化チタンの結晶化—Low temperature crystallization of titanium oxide

    戸田 健司, 上松 和義, 佐藤 峰夫

    リガクジャーナル / リガクジャーナル編集委員会 編   38 ( 1 )   14 - 18   2007.4

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  • 新規な白色LED用ケイ酸塩蛍光体(受賞論文要約)

    新潟大学工学部研究報告   56   3 - 4   2007.3

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  • Development of novel phosphor for white LED

    Kawakami Yoshitaka, Komeno Akira, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   708 - 708   2007

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    DOI: 10.14853/pcersj.2007f.0.708.0

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  • Development of nitride phosphors

    Sato Kenji, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   705 - 705   2007

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    DOI: 10.14853/pcersj.2007f.0.705.0

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  • Development of new photocatalyst

    nakajima sae, ishikawa hironori, Uematsu kazuyoshi, toda kenji, sato mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   693 - 693   2007

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    DOI: 10.14853/pcersj.2007f.0.693.0

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  • Low Temperature Growth of Potassium Niobate Single Crystal

    Iida Akihiro, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   273 - 273   2007

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    DOI: 10.14853/pcersj.2007f.0.273.0

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  • Synthesis of novel phosphor for white LED

    Seki Satomi, Ito Yutaka, Uematsu Kazuyosi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   703 - 703   2007

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    DOI: 10.14853/pcersj.2007f.0.703.0

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  • Synthesis of Phosphor materials using Asbestos as a Raw Material

    Toda Kenji, Shirakura Shigeki, Kawada Satoshi, Hosoume Masashi, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007S   586 - 586   2007

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    DOI: 10.14853/pcersj.2007s.0.586.0

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  • Application of layered tantalum oxides nanosheet to photocatalytic reaction

    Mori Yoshiyuki, Kibe Hidetoshi, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   689 - 689   2007

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    DOI: 10.14853/pcersj.2007f.0.689.0

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  • Preparation of KNbO<SUB>3</SUB> thin film at room temperature

    Takahashi Toshinari, Sugawara Akira, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   278 - 278   2007

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    DOI: 10.14853/pcersj.2007f.0.278.0

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  • Synthesis and Photocatalytic Activity of Langasite Oxynitride

    Narumi Yousuke, Ishikawa Hironori, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   690 - 690   2007

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    DOI: 10.14853/pcersj.2007f.0.690.0

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  • next generation photcatalyst synthesis and evaluation

    oohashi mamoru, uematsu kazuyoshi, toda kenji, satou mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   691 - 691   2007

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    DOI: 10.14853/pcersj.2007f.0.691.0

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  • New photocatalyst of metal oxides with d0 and d10 configulation

    Ishikawa Hironori, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   692 - 692   2007

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    DOI: 10.14853/pcersj.2007f.0.692.0

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  • Synthesis and their electrochemical lithium-insertion/deinsertion properties of Solid-solution of Li2FeGeS4 and Li2MnGeS4

    Narita Issei, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   683 - 683   2007

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    DOI: 10.14853/pcersj.2007f.0.683.0

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  • Synthesis of ZnWO<SUB>4</SUB> phosphor by single mode microwave heating

    UEMATSU Kazuyoshi, HASEGAWA Yu, TODA Kenji, SATO Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   710 - 710   2007

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    DOI: 10.14853/pcersj.2007f.0.710.0

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  • Synthesis of phosphate phosphor

    Hatsumori Tomoki, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   706 - 706   2007

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    DOI: 10.14853/pcersj.2007f.0.706.0

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  • developent of novel nitride phosphor for LED

    Nakano Tomouki, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   704 - 704   2007

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    DOI: 10.14853/pcersj.2007f.0.704.0

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  • Search for photocatalytic properties of metal oxides with d10 configuration

    Hatakeyama Hirotoshi, Narumi Yousuke, Ishikawa Hironori, Uematsu Kazuyoshi, Toda Knji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   694 - 694   2007

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    DOI: 10.14853/pcersj.2007f.0.694.0

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  • Possibility of Superconductivity in a Layered Perovskite Niobate, KCa2Nb3O10, Synthesized by an Ion Exchange Reaction

    TAKEZAWA Sachi, TERANISHI Takashi, ISHIKAWA Hironori, TOKUMITSU Toshiaki, TODA Kenji, UEMATSU Kazuyoshi, SATO Mineo

    Journal of the Ceramic Society of Japan   114 ( 1334 )   861 - 865   2006.10

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    We prepared low temperature phase of triple layered perovksite KCa<sub>2</sub>Nb<sub>3</sub>O<sub>10</sub> by an ion-exchange reaction. Li-intercalated low temperature phase, Li<sub>0.79</sub>KCa<sub>2</sub>Nb<sub>3</sub>O<sub>10</sub>, shows strong diamagnetic signal around at 7.8 K. The magnetic phase transition temperature of Li-intercalated low temperature phase is higher than that of Li-intercalated high temperature phase.<br>

    DOI: 10.2109/jcersj.114.861

    DOI: 10.1016/j.physb.2017.09.060_references_DOI_EGGTIU2JpJCXavLnVj8JNJxccZK

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    Other Link: https://niigata-u.repo.nii.ac.jp/records/3585

  • エトリンガイトによる水溶液からのフッ化物イオンの除去(テクニカルコミュニケーション)

    TOKUMITSU Toshiaki, SATO Kenji, TODA Kenji, MORINAGA Hiroko, UEMATSU Kazuyoshi, SATO Mineo

    日本セラミックス協会学術論文誌   114 ( 1332 )   729 - 732   2006.8

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    In order to purify waste water containing fluoride, the calcium additive method has usually been used to recover fluoride ions in the form of refractory calcium fluoride. In this case, the removable fluoride concentration is limited to be 10-15 mg/l due to the solubility of calcium fluoride. In this study, we report 3CaO•Al<sub>2</sub>O<sub>3</sub>•3CaSO<sub>4</sub>•32H<sub>2</sub>O (ettringite) as a highly absorbent substance for the fluoride. The fluoride concentration of the water treated with the ettringite was achieved to be less than 8 mg/l without sludge.<br>

    DOI: 10.2109/jcersj.114.729

    DOI: 10.1252/jcej.10we160_references_DOI_RLnQebpkdJVgWI9S7GWHWyEXMfX

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  • シリカサンドからの蛍光体の合成

    NONOGAWA Takashi, IMANARI Yu-ichiro, TODA Kenji, SHIRAKURA Shigeki, UEMATSU Kazuyoshi, SATO Mineo, TODA Ayano, NISHISU Yoshihiro, KOBAYASHI Mikio

    日本セラミックス協会学術論文誌   113 ( 1318 )   442 - 445   2006.6

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    The silica sand is primarily composed of high purity SiO<sub>2</sub>. Mt. Iide over Niigata, Yamagata and Fukushima prefectures is known as a rich mine for silica sand. In this study, we adopted natural resource (silica sand from Mt. Iide, Osodani area) as a starting material for the synthesis of akermanite type long-persistent phosphor Sr<sub>2</sub>MgSi<sub>2</sub>O<sub>7</sub>: Eu<sup>2+</sup>, Dy<sup>3+</sup>. The silica sand derived (Sr<sub>0.98</sub>Eu<sub>0.01</sub>Dy<sub>0.01</sub>)<sub>2</sub>MgSi<sub>2</sub>O<sub>7</sub> showed long afterglow phenomena. Therefore, the silica sand can be potentially used in preparing silicate phosphors.<br>

    DOI: 10.2109/jcersj.113.442

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    Other Link: http://hdl.handle.net/10191/26491

  • Development of novel alkaline earth silicate phosphor for LED

    KAWAKAMI Yoshitaka, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    ( 48 )   136 - 137   2006.5

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  • Synthesis and characterization of long afterglow UV emission phosphors

    Hosoume Masafumi, Toda Kenji, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006F ( 48 )   207 - 207   2006.5

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    DOI: 10.14853/pcersj.2006f.0.207.0

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  • Luminescent properties of white long persistence phosphors, Mg_2SnO_4, doped with Eu^<3+>

    ABE Sho, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    ( 48 )   120 - 121   2006.5

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  • Synthesis of organic/inorganic composite with rare earth complex

    IKARASHI Kazuya, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    ( 48 )   88 - 89   2006.5

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  • Luminescence Properties and Crystal Chemistry of New Phosphors

    TODA Kenji, UEMATSU Kazuyoshi, SATO Mineo

    ( 48 )   26 - 27   2006.5

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  • チェレンコフ光を用いた空気中ラドン濃度測定の新規方法の開発

    新潟大学工学部技術部報告集   2   29 - 33   2006.3

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  • Application of layered tantalum oxides nanosheet to photocatalytic reaction

    mori yoshiyuki, kibe hidetoshi, uematsu kazuyoshi, toda kennji, sato mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006F   190 - 190   2006

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    DOI: 10.14853/pcersj.2006f.0.190.0

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  • New UV long afterglow phosphor

    Toda Kenji, Hosoume Masashi, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006S   245 - 245   2006

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    DOI: 10.14853/pcersj.2006s.0.245.0

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  • Potentiality of Mg2SnO4 crystal as host material of persistent luminescent phosphors

    uematsu kazuyoshi, kaneko hiroaki, toda kenji, sato mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006F   183 - 183   2006

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    DOI: 10.14853/pcersj.2006f.0.183.0

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  • Development of New Red Phosphor for LED

    kousaka shinichiro, uematsu kazuyoshi, toda kenji, sato mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006F   194 - 194   2006

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    DOI: 10.14853/pcersj.2006f.0.194.0

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  • Synthesis for LED red phosphor : Ba2Gd3Li3Mo8O32

    Seki Satomi, Ito Yutaka, Uematsu Kazuyosi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006F   189 - 189   2006

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    DOI: 10.14853/pcersj.2006f.0.189.0

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  • Synthesis of nitride by thermolysis in NH3 gas

    Matsumoto Takako, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006F   186 - 186   2006

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    DOI: 10.14853/pcersj.2006f.0.186.0

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  • Photocatalytic Activity of Bismuth Layered Perovskite Treated with Acids

    Narumi Yousuke, Matsumoto Takako, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006F   191 - 191   2006

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    DOI: 10.14853/pcersj.2006f.0.191.0

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  • Synthesi and photocatalytic property of new tantalate

    kibe Hidetoshi, uematsu kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006F   188 - 188   2006

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    DOI: 10.14853/pcersj.2006f.0.188.0

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  • Crystal Chemistry and Luminescence Properties of new LED Phosphors

    Toda Kenji, Ito Yutaka, Uematsu Kazuyoshi, Sato Mineo, Komeno Akira

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006S   80 - 80   2006

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    DOI: 10.14853/pcersj.2006s.0.80.0

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  • Synthesis of Silicate Phosphors from Asbestos-related Raw Materials

    Toda Kenji, Shirakura Shigeki, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006S   570 - 570   2006

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    DOI: 10.14853/pcersj.2006s.0.570.0

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  • A6 Synthesis of Iron-based Cathode Materials for Lithium Ion Battery using Sonochemical Method

    Okawa Hirokazu, Nakasato Shingo, Yabuki Junpei, Kawamura Yohei, Arise Ichiro, Uematsu Kazuyoshi, Sato Mineo

    Proceedings of the Annual Meeting of the Japan Society of Sonochemistry   15   13 - 14   2006

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    At present, lithium cobalt oxides and lithium nickel oxides are mainly used as cathodes of lithium ion batteries. This is because these materials show very high battery performance. However, they are not suitable for large-scaled batteries such as hybrid vehicles, because they are expensive and poor in resources. We then focused on iron because it is cheaper and more abundant. Iron Phosphate (FeO_4) is one of the most interesting materials in Iron based materials so far because it shows a high discharge voltage of 3.5 volts. The theoretical capacity is 170mAh/g, which is sufficient enough compared to present materials being used as lithium ion batteries. The remarkable feature of FePO_4 is that it can be synthesized in air. Its treatment is very easy but the cycle performance shows poor. In this study, we have tried to obtain good cycle performance and improve discharge capacity of FePO_4 utilizing the sonochemical method. The sonochemical reaction was conducted under the irradiation of ultrasound power 200W and frequency 200kHz for 3hours. The crystalline phase was identified by powder X-ray diffraction. The cathode for the electrochemical characterization was made by mixing powders of the sample, acetylene black and PTFE in 70:25:5 weight ratio under Argon atmosphere. The cathode properties were measured in a galvanic cell with a nonaqueous electrolyte, a polypropylene separator and a Li metal anode. Charge/Discharge performances were evaluated at a current rate of 2C in the voltage range between 2 to 3.9 volts. The first discharge profile obtained for the sample heated at 700℃ is improved about 10% compared with a previous report's one. We could also obtain LiFePO_4 by the sonochemical method.

    DOI: 10.20577/pamjss.15.0_13

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  • Removal of Fluoride ion by Ettringite

    sato kenji, morinaga hiroko, tokumitsu toshiaki, uematsu kazuyoshi, toda kenji, sato mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006F   475 - 475   2006

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    DOI: 10.14853/pcersj.2006f.0.475.0

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  • Synthesis of TiO2 from rutile ore

    nakajima sae, yamanaka yoshiomi, uematsu kazuyoshi, toda kenji, sato mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006F   416 - 416   2006

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    DOI: 10.14853/pcersj.2006f.0.416.0

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  • Powder Neutron Diffraction Study of Layered Perovskite, KCa2Nb3O10

    TOKUMITSU Toshiaki, TODA Kenji, AOYAGI Tsukuru, SAKURABA Daiki, UEMATSU Kazuyoshi, SATO Mineo

    Journal of the Ceramic Society of Japan   114 ( 1333 )   795 - 797   2006

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    Crystal structure of a layered perovskite, KCa<sub>2</sub>Nb<sub>3</sub>O<sub>10</sub>, was determined by the Rietveld refinement method for a powder neutron diffraction pattern. The compound crystallizes a monoclinic system with a space group <i>P</i>2<sub>1</sub>/<i>m</i> (No. 11) and lattice parameters of <i>a</i>=0.77418(6) nm, <i>b</i>=0.77073(6) nm, <i>c</i>=1.4859(1) nm, β=97.51(1)°.<br>

    DOI: 10.2109/jcersj.114.795

    DOI: 10.2109/jcersj2.117.1161_references_DOI_M2YzFGKZfHyiCOzTUneDb1kXGvV

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  • P18 Synthesis of Fe_3PO_7 Cathode Material for Lithium Iron Battery by Sonochemical Method(Poster Session)

    Nakasato Shingo, Okawa Hirokazu, Kawamura Yohei, Uematsu Kazuyosi, Sato Mineo

    Proceedings of the Annual Meeting of the Japan Society of Sonochemistry   15   81 - 82   2006

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    Iron is expected as a positive electrode material because of its large Clarke number. In this reason, we have been interesting in iron based materials and been studying. In this time we focused on Fe_3PO_7. The theoretical capacity as cathode is 777mAh/g. Its large capacity is very attractive to compare to present materials being used as lithium ion batteries (LiCoO_2: 274mAh/g, LiMn_2O_4: 148mAh/g). The literature shows that Fe_3PO_7 was prepared by the two-step solid-state reaction. At first stoichiometric amounts of Fe_2O_3 and (NH_4)_2HPO_4 powders are mixed and heated 950 degrees Celsius for 12hour to synthesize FePO_4. Fe_2O_3 and FePO_4 are mixed and preheated 950 degrees Celsius for 12hour and finally heated at 1050 degrees Celsius and finally Fe_3PO_7 is prepared. Fe_3PO_7 requires a lot of time and high sintered temperature. To improve these problems, we have been studying about an easily synthesis method of Fe_3PO_7. In this study, we used the sonochemical method and try to obtain Fe_3PO_7 by one step reaction.

    DOI: 10.20577/pamjss.15.0_81

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  • Development of novel phosphor for LED

    kawakami yoshitaka, uematsu kazuyoshi, toda kenji, sato mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006F   169 - 169   2006

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    DOI: 10.14853/pcersj.2006f.0.169.0

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  • New photocatalytic of metal oxides with d10 configulation

    Ishikawa Hironori, uematsu kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006F   170 - 170   2006

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    DOI: 10.14853/pcersj.2006f.0.170.0

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  • Synthesis of Phosphors using Asbestos as a Raw Material

    Toda Kenji, Shirakura Shigeki, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006F   168 - 168   2006

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    DOI: 10.14853/pcersj.2006f.0.168.0

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    Other Link: http://id.ndl.go.jp/bib/8535149

  • Preparation of KNbO<sub>3</sub> thin film at room temperature

    Takahashi Toshinari, Sugawara Akira, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2006F   55 - 55   2006

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    DOI: 10.14853/pcersj.2006f.0.55.0

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  • 長残光蛍光体Sr2MgSi2O7 : Eu,Dyのゾル-ゲル合成

    SHIRAKURA Shigeki, TODA Kenji, IMANARI Yu-ichiro, NONOGAWA Takashi, UEMATSU Kazuyoshi, SATO Mineo, NISHISU Yoshihiro, KOBAYASHI Mikio

    日本セラミックス協会学術論文誌   113 ( 1319 )   484 - 487   2005.7

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    Long persistent phosphor Sr<sub>2</sub>MgSi<sub>2</sub>O<sub>7</sub>: Eu, Dy thin film was prepared by a sol-gel method. The phosphor showed bright blue-green long-lasting afterglow. The afterglow property of sol-gel derived sample was comparable to that of samples prepared by solid state reaction.<br>

    DOI: 10.2109/jcersj.113.484

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  • Photocatalytic Property of Layered Tantalate with Rare Earth Ion

    TODA Kenji, KIBE Hidetoshi, UEMATSU Kazuyoshi, SATO Mineo, SHIMIZU Ken-ichi, HOTTA Noriyasu

    46   188 - 189   2005.5

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  • Synthesis and application of alkaline earths silicate group phosphors

    KOMENO Akira, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    46   112 - 113   2005.5

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  • Synthesis of novel LED yellow phosphor

    ITO Yutaka, KAWAMOTO Mika, TODA Kenji, UEMATSU Kazuyoshi, SATO Mineo

    46   118 - 119   2005.5

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  • 高温下における誘電特性測定用開放端同軸プローブの開発

    新潟大学工学部技術部報告集   1   19 - 28   2005.3

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  • Removement of Fluoride ion by Ettringite

    Sato Kenji, Morinaga Hiroko, Tokumitsu Toshiaki, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   642 - 642   2005

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    DOI: 10.14853/pcersj.2005f.0.642.0

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  • Development of new tantalate photocatalysts

    Toda Kenji, Sato Hiroki, Matsumoto Takako, Kibe Hidetoshi, Shimizu Ken-ichi, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005S   309 - 309   2005

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    DOI: 10.14853/pcersj.2005s.0.309.0

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  • Properties of long afterglow silicate phosphor

    Toda Kenji, Ito Yutaka, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   663 - 663   2005

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    DOI: 10.14853/pcersj.2005f.0.663.0

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  • Photocatalytic Activity of Layered Perovskite Tantalum Oxynitride

    Sato Hiroki, Toda Kenji, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   656 - 656   2005

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    DOI: 10.14853/pcersj.2005f.0.656.0

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  • Photochromism

    Yamanaka Yoshiomi, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo, Hotta Noriyasu

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   650 - 650   2005

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    DOI: 10.14853/pcersj.2005f.0.650.0

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  • Low temperature synthesis of TiO2

    Yamanaka Yoshiomi, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo, Hotta Noriyasu

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   753 - 753   2005

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    DOI: 10.14853/pcersj.2005f.0.753.0

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  • Synthesis of KNbO3 thin film by self-assembly of perovskite nanosheet

    Sugawara Akira, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   45 - 45   2005

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    DOI: 10.14853/pcersj.2005f.0.45.0

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  • Development of long afterglow UV emission phosphors

    Hosoume Masafumi, Toda Kenji, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   652 - 652   2005

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    DOI: 10.14853/pcersj.2005f.0.652.0

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  • Soft chemical synthesis of ferroelctric materials

    Toda Kenji, Sugawara Akira, Iida Akihiro, Uematsu Kazuyoshi, Sato Mineo, Shimizu Ken-ichi, Osada Minoru, Zuo-Guang Ye

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   768 - 768   2005

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    DOI: 10.14853/pcersj.2005f.0.768.0

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  • Microwave Synthesis of Inorganic Materials

    Sato Mineo, Uematsu Kazuyoshi, Toda Kenji

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   733 - 733   2005

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    There are several advantages in microwave heating compared with conventional heating techniques, in view of potentials for energy saving and shorter processing time for inorganic materials syntheses. In this presentation, we report a self-consistently completed solid-state reaction for syntheses of YVO<SUB>4</SUB>:Eu<SUP>3+</SUP>, Mg<SUB>2</SUB>SnO<SUB>4</SUB>:Mn<SUP>2+</SUP> phosphors, and LiFePO<SUB>4</SUB> cathode materials using a microwave heating.

    DOI: 10.14853/pcersj.2005f.0.733.0

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  • Development of new silicate phosphors for white LED

    Toda Kenji, Ito Yutaka, Kawamoto Mika, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005S   460 - 460   2005

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    DOI: 10.14853/pcersj.2005s.0.460.0

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  • Luminescence properties of Mg2SnO4:Mn2+ phosphors synthesized by microwave heating method

    uematsu kazuyoshi, ochiai ayumi, toda kenji, sato mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   664 - 664   2005

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    DOI: 10.14853/pcersj.2005f.0.664.0

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  • Development of new alkaline earth silicate phosphors for LED

    Kawakami Yoshitaka, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   655 - 655   2005

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    DOI: 10.14853/pcersj.2005f.0.655.0

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  • Synthesis of Eu3+ doped new silicate red phosphor for LED

    kosaka shinichiro, uematsu kazuyoshi, toda kenji, sato mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   654 - 654   2005

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    DOI: 10.14853/pcersj.2005f.0.654.0

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  • Development of new silicate group phosphor

    Komeno Akira, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   585 - 585   2005

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    DOI: 10.14853/pcersj.2005f.0.585.0

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  • Synthesis of new LED yellow phosphor Li2SrSiO4:Eu2+

    Ito Yutaka, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   657 - 657   2005

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    DOI: 10.14853/pcersj.2005f.0.657.0

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  • Synthesis of niobate compounds by soft chemistry

    iida akihiro, sugawara akira, uematsu kazuyoshi, toda kenji, sato mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   651 - 651   2005

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    DOI: 10.14853/pcersj.2005f.0.651.0

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  • Photocatalytic Activity of Barium Tantalum Oxynitride

    Matsumoto Takako, Uematsu Kazuyoshi, Toda Kenji, Hotta Noriyasu, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   649 - 649   2005

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    DOI: 10.14853/pcersj.2005f.0.649.0

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  • Photocatalytic property of layered perovskite

    ishikawa hironori, kibe hidetoshi, mastumoto takako, sato hiroki, yamanaka yoshiomi, hotta noriyasu, UEMATSU Kazuyoshi, toda kenji, sato mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   648 - 648   2005

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    DOI: 10.14853/pcersj.2005f.0.648.0

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  • Synthesis and photocatalytic property of new tantalate

    Kibe Hidetoshi, uematsu kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2005F   647 - 647   2005

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    DOI: 10.14853/pcersj.2005f.0.647.0

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  • VUV phosphors in Ternary System SrO-B_2O_3-P_2O_5

    KOMATSU Yusuke, TODA Kenji, UEMATSU Kazuyoshi, SATO Mineo

    44   156 - 157   2004.5

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  • Photocatalytic Property of Layered Perovskite Tantalate with Rare Earth Ion

    TODA Kenji, SHIMIZU Ken-ichi, UENO Miyuki, UEMATSU Kazuyoshi, SATO Mineo

    44   22 - 23   2004.5

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  • Synthesis of long persistent white silicate phosphor

    ITO Yutaka, TODA Kenji, UEMATSU Kazuyoshi, SATO Mineo

    44   146 - 147   2004.5

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  • Luminescent properties of red long persistent phosphors, BaMg_2Si_2O_7:Eu^<2+>, Mn^<2+>

    ABE Sho, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    44   148 - 149   2004.5

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  • Triboluminescence of niobates

    Toda Kenji, Sakuraba Daiki, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2004F   297 - 297   2004

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    DOI: 10.14853/pcersj.2004f.0.297.0

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  • The investigation of Fe series cathode materials wth boron

    Katayama Yoshifumi, Sato Mineo, Toda Kenji, Uematsu Kazuyoshi

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2004F   624 - 624   2004

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    DOI: 10.14853/pcersj.2004f.0.624.0

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  • Synthesis and Photocatalytic Property of Layered Perovskite Tantalate

    Sato Hiroki, Matsumoto Takako, Yamanaka Yoshiomi, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2004F   477 - 477   2004

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    DOI: 10.14853/pcersj.2004f.0.477.0

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  • Low temperature synthesis of titania

    Toda Kenji, Shimizu Ken-ichi, Kawakami Masato, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2004F   110 - 110   2004

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    DOI: 10.14853/pcersj.2004f.0.110.0

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  • Synthesis of thin film by laminating of perovskite nanosheets

    Sugawara Akira, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2004F   150 - 150   2004

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    DOI: 10.14853/pcersj.2004f.0.150.0

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  • Search for Borophosphate System phosphors

    Komatsu Yusuke, Toda kenji, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2004F   645 - 645   2004

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    DOI: 10.14853/pcersj.2004f.0.645.0

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  • Synthesis of long persistent white Ca-Sr-Al-Si-O phosphor

    Ito Yutaka, Komeno Akira, Uematsu Kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2004F   643 - 643   2004

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    DOI: 10.14853/pcersj.2004f.0.643.0

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  • Development of alkaline earths silicate group host for VUV phosphors.

    Komeno Akira, Uematsu kazuyoshi, Toda Kenji, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2004F   644 - 644   2004

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    DOI: 10.14853/pcersj.2004f.0.644.0

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  • Search for the VUV Phosphors in Ternary System SrO-B<sub>2</sub>O<sub>3</sub>-P<sub>2</sub>O<sub>5</sub>

    TODA KENJI, KOMATSU YUSUKE, UEMATSU KAZUYOSHI, SATO MINEO

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2004S   554 - 554   2004

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    Luminescence properties under a vacuum ultraviolet (VUV) excitation investigated for phosphors in SrO-B<sub>2</sub>O<sub>3</sub>-P<sub>2</sub>O<sub>5</sub> ternary system. The borophosphates have a relatively strong absorption band in a VUV region because of strong covalent characters of B-O and P-O bonds. One of these phosphors activated by Eu<sup>2+</sup> showed a strong luminescence, which is about twice as bright as a commercial blue phosphor, BAM (BaMgAl<sub>10</sub>O<sub>17</sub>: Eu<sup>2+</sup>). This can be an attractive candidate of phosphors for plasma display panels (PDPs) and mercury-free fluorescent lamps.

    DOI: 10.14853/pcersj.2004s.0.554.0

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  • Influence of High-Temperature Treatment of Silica Gel and Porous Glass on Concentration of Tritiated Water by Adsorption Method

    UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    RADIOISOTOPES   53 ( 8 )   435 - 443   2004

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    <I>Silica gels and porous glasses thermally treated at various temperatures were examined for use as an adsorbent to separate tritiated water</I> (HTO) <I>with an adsorption method. The</I> HTO <I>was adsorbed much stronger than</I> H<SUB>2</SUB>O. <I>A high partition coefficient of 1.38 was observed for the thermally treated silica gel at 1100°C in vacuo. From the measurement of</I> IR <I>spectra, isolated silanol groups were formed on the thermally treated silica gel surface. We can conclude that there is a large mass effect for the concentration of tritiated water on the thermally treated silica gels because hydroxyl groups or water molecules adsorbed on them are difficult to form hydrogen bonds with each other.</I>

    DOI: 10.3769/radioisotopes.53.435

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  • Synthesis of oxynitride photocatalyst using fluidized bed

    Toda Kenji, Uematsu Kazuyoshi, Yamanaka Yoshiomi, Satou Hiroki, Matsumoto Takako, Satou Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2004F   478 - 478   2004

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    DOI: 10.14853/pcersj.2004f.0.478.0

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  • Structural Characterization of Bismuth Layered Perovskite via Acid Treatment

    Toda Kenji, Aoyagi Tsukuru, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2004F   167 - 167   2004

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    DOI: 10.14853/pcersj.2004f.0.167.0

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  • Hydrothermal Synthesis of Organic/Inorganic Molybdate Composites Templated by Europium Complexes with 2, 2'-bipyridine

    KOBAYASHI Hidekazu, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    42   218 - 219   2003.5

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  • Synthetic Route of Rare Earth Niobates using Rubidium Flux Component

    TODA Kenji, NAKADA Akira, UEMATSU Kazuyoshi, SATO Mineo

    42   220 - 221   2003.5

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  • マイクロ波加熱を用いて合成したYVO4 : Eu3+蛍光体の物性

    技術発表会報告集   5   13 - 20   2003.3

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  • Crystal Chemistry of Rb-Ln-Nb-O system (Ln=rare earths)

    Toda Kenji, Nakada Akira, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2003S   568 - 568   2003

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    New inorganic materials have been searched in ternary system, A<sub>2</sub>O - Ln<sub>2</sub>O<sub>3</sub>- M<sub>2</sub>O<sub>5</sub> and A<sub>2</sub>O- BO-M<sub>2</sub>O<sub>5</sub> (Ln = Rare earths; A = Rb, K, Na and Li; B = Ca, Sr and Ba; M = Ta and Nb). Oxygen-deficient orthoniobate and fluorite-related strucrture were newly synthesized in the ternary system Rb<sub>2</sub>O- Ln<sub>2</sub>O<sub>3</sub> - Nb<sub>2</sub>O<sub>5</sub>.

    DOI: 10.14853/pcersj.2003s.0.568.0

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  • Characterization of Phosphors in the Eu-doped Sr-Al-B-O system

    MIYOSHI Jun-ichi, TODA Kenji, UEMATSU Kazuyoshi, SATO Mineo, NISHISU Yoshihiro, KOBAYASHI Mikio

    Journal of Ecotechnology Research   9 ( 2 )   137 - 142   2003

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    Language:English   Publisher:International Association of Ecotechnology Research  

    Phosphor materials have been searched in the Sr-Al-B-O system. For a molar ratio (Sr<SUB>1-x</SUB>Eu<SUB>x</SUB>) : Al : B = 1 : 2 : 2 (x = 0.01), a crystalline layered compound SrAl<SUB>2</SUB>B<SUB>2</SUB>O<SUB>7</SUB>:Eu<SUP>2+</SUP> was synthesized at 900 °C for 12 h in a reductive atmosphere. The SrAl<SUB>2</SUB>B<SUB>2</SUB>O<SUB>7</SUB>:Eu<SUP>2+</SUP> showed blue emission under UV (254 nm) and VUV (Vacuum Ultraviolet, 146 nm) excitation. For the ratio (Sr<SUB>1-x</SUB>Eu<SUB>x</SUB>) : Al : B = 2 : 2 : 2 (x = 0.01), a transparent glass and SrAl<SUB>2</SUB>O<SUB>4</SUB> component with a long afterglow phosphorescence was found.

    DOI: 10.11190/jer.9.137

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  • Synthesis of vacuum ultraviolet phosphors by self-flux method

    INADA Naoki, TODA Kenji, UEMATSU Kazuyoshi, SATO Mineo, NISHISU Yoshihiro, KOBAYASHI Mikio

    Journal of Ecotechnology Research   9 ( 2 )   143 - 147   2003

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    Vacuum ultraviolet (VUV) phosphors are inorganic optical materials used in mercury-free fluorescent lamps and plasma display panels (PDP). Promising red VUV phosphor, GdBO<SUB>3</SUB>:Eu<SUP>3+</SUP>, were synthesized by a flux method. Studies of the phosphor synthesis reaction show that the flux (e.g., B<SUB>2</SUB>O<SUB>3</SUB>, RbCl) serves as an important reactant. The phosphor particles prepared by the flux method at 1100°C with RbCl flux had the highest PL intensity under VUV excitation (146 nm), which corresponded to 126 % of that of particles prepared from raw material mixture without flux.

    DOI: 10.11190/jer.9.143

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  • Soft chemical reactions of Layered perovskite K2NbO3F

    Toda Kenji, Tokuoka Saori, Ohtake Naotaka, Uematsu Kazuyoshi, Sato Mineo

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2003S   357 - 357   2003

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    Submicron particles of potassium niobate KNbO3 were prepared by new colloid chemistry method. A rock-salt-type KF block in a layered perovskite, K2NbO3F, with a K2NiF4 type structure was selectively dissolved in water to produce niobate nanosheets at room temperature. The self-assembly between niobate nanosheets in a colloidal solution produce the nano powder of potassium niobate.

    DOI: 10.14853/pcersj.2003s.0.357.0

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  • Synthesis of Phosphor Materials Using Natural Ore "Serpentine".

    IMANARI Yu-ichiro, NONOGAWA Takashi, MIYOSHI Jun-ichi, TODA Kenji, UEMATSU Kazuyoshi, SATO Mineo, KOSUGE Katsunori, NISHISU Yoshihiro, KOBAYASHI Mikio

    Journal of the Ceramic Society of Japan   111 ( 1290 )   151 - 154   2003

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    Serpentine is a hydrated ultra-mafic rock, which is primarily composed of magnesium silicate minerals such as chrysotile and antigorite. Fibrous chrysotile is the most common type of asbestos. Since the rich mines supplied serpentine in Japan, application of natural ore “serpentine” as raw materials for ceramics has one of the potentially lowest cost ceramics production. In this study, long afterglow phosphor, Sr<SUB>2</SUB>MgSi<SUB>2</SUB>O<SUB>7</SUB>, has been successfully synthesized using natural ore serpentinite. Eu<SUP>2+</SUP> and Dy<SUP>3+</SUP> co-doped compounds show long-lasting phosphorescence. This demonstrates that the “serpentine” could be used in preparing alkaline earth silicate phosphors.

    DOI: 10.2109/jcersj.111.151

    DOI: 10.2109/jcersj.113.442_references_DOI_A2RoNK85UqXLdK43cPeGvxU9RL4

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  • 層状ペロブスカイトの光触媒特性—Photocatalytic Activity of Layered Perovskites

    川上 正人, 辻 由浩, 清水 研一, 上松 和義, 戸田 健司, 佐藤 峰夫, 北山 淑江

    Journal of ecotechnology research : official journal of International Association of Ecotechnology Research   8 ( 1 )   47 - 52   2002.7

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  • Synthesis of long persistent silicate phosphor from the natural resources

    NONOGAWA Takashi, IMANARI Yuichiro, TODA Kenji, UEMATSU Kazuyoshi, SATO Mineo

    40   216 - 217   2002.5

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  • Photoreduction of A-site deficient perovskite with rare eath

    KAWAKAMI Masato, TODA Kenji, UEMATSU Kazuyoshi, SATO Mineo

    40   236 - 237   2002.5

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  • Research and characterization of the phosphor for mercury-free fluorescent lamps

    TODA Kenji, NONOGAWA Takashi, IMANARI Yuichiro, UEMATSU Kazuyoshi, SATO Mineo

    40   144 - 145   2002.5

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  • Incorporation of Rare Earth Metal Ions into Interlayer Space of Layered Perovskites by Hydrothermal Reaction

    KOBAYASHI Hidekazu, UEMATSU Kazuyoshi, TADA Kenji, SATO Mineo

    40   52 - 53   2002.5

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  • 家庭用電子レンジを用いた無機化合物の合成

    技術発表会報告集   4   12 - 21   2002.3

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  • Synthesis and Characterization of New Long Persistent Phosphor.

    TODA Kenji, IMANARI Yu-ichiro, NONOGAWA Takashi, MIYOSI Junichi, UEMATSU Kazuyoshi, SATO Mineo

    Journal of the Ceramic Society of Japan   110 ( 1280 )   283 - 288   2002

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    Rare earth-doped alkaline earth silicates, Sr<sub>2</sub>MgSi<sub>2</sub>O<sub>7</sub>:Eu<sup>2+</sup>, Dy<sup>3+</sup> and Ca<sub>2</sub>MgSi<sub>2</sub>O<sub>7</sub>:Eu<sup>2+</sup>, Dy<sup>3+</sup>, with an akermanite-type structure show bright and long-lasting phosphorescence. After irradiation by a white-color fluorescent lamp (780lm) for 5min, the light blue emission of Sr<sub>2</sub>MgSi<sub>2</sub>O<sub>7</sub>:Eu<sup>2+</sup>, Dy<sup>3+</sup> was observable by naked eye in the dark for over 100min after removal of the excitation light source.

    DOI: 10.2109/jcersj.110.283

    DOI: 10.2109/jcersj.113.484_references_DOI_UabaKv3VzqBTXgsEys66T5Qof6R

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  • Relationship between Conductivities and Compositions Determined by EPMA for Apatite-type Nd<sub><i>x</i></sub>(SiO<sub>4</sub>)<sub>6</sub>O<sub>1.5<i>x</i>−12</sub> Single Crystals

    NAKAYAMA Susumu, HIGUCHI Mikio, UEMATSU Kazuyoshi

    NIPPON KAGAKU KAISHI   2002 ( 2 )   243 - 245   2002

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    Four kinds of single crystals of hexagonal apatite type Nd<sub><i>x</i></sub>(SiO<sub>4</sub>)<sub>6</sub>O<sub>1.5<i>x</i>−12</sub> (<i>x</i> = 8–9.33), which is an oxide ionic conductor, were prepared by the FZ method and samples for electrical measurements (the conductivity components parallel and perpendicular to the <i>c</i>-axis of single crystal) were prepared. The conductivities of the component parallel to the <i>c</i>-axis were higher about one order of magnitude, compared with those of the component perpendicular. The values of (Nd/Si) × 6 of four kinds of samples were 8.63, 8.67, 8.91 and 9.33 determined by electron probe micro-analysis. The conductivity was slightly increased with decreasing the value of (Nd/Si) × 6.<br>

    DOI: 10.1246/nikkashi.2002.243

    DOI: 10.2109/jcersj2.122.921_references_DOI_8NiERzZTsSAZIopz8O6ob00rsrq

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  • Development of phosphors for mercury-free fluorescent lamp

    TODA Kenji, NONOGAWA Takashi, IMANARI Yu-ichiro, UEMATSU Kazuyoshi, SATO Mineo

    ( 38 )   238 - 239   2001.5

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  • Development of new long persistence phosphor with an akermanite structure

    NONOGAWA Takashi, IMANARI Yuichiro, TODA Kenji, UEMATSU Kazuyoshi, SATO Mineo

    ( 38 )   246 - 247   2001.5

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  • Role of the rare earth in the photocatalytic decomposition on layered Perovskites

    KAWAKAMI Masato, TODA Kenji, uematsu kazuyoshi, SATO Mineo

    ( 38 )   188 - 189   2001.5

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  • 第2回RI新潟地区ネット 「放射線・放射能のやさしい解説とその利用」

    上松 和義

    Isotope news   562   18 - 21   2001.3

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  • ゲルマニウム半導体検出器を使ったγ線スペクトロメトリー

    技術発表会報告集   3   24 - 28   2001.3

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  • Upconversion fluorescence in Er^<3+> and Yb^<3+> doped Na_3YGe_2O_7

    YOSHIDA Hideki, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    ( 36 )   198 - 199   2000.5

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  • 吸着脱離法によるトリチウム水の濃縮

    技術発表会報告集   2   65 - 69   2000.3

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  • X線光電子分光装置付属の高速エッチング装置を利用した標準用Auスパッタの試み

    技術発表会報告集   1   56 - 61   1999.11

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  • Upconversion fluorescence in Er^<3+> and Yb^<3+> doped NaYGeO_4

    YOSHIDA Hideki, UEMATSU Kazuyoshi, TODA Kenji, SATO Mineo

    ( 34 )   270 - 271   1999.5

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  • Ionic conductivity of Li_<3-2x>(Sc_<1-x>Zr_x)_2(PO_4)_3 thin Film prepared by sputtering method

    SHIMOSAKI Tomoaki, SUZUKI Takahito, uematsu kazuyoshi, TODA Kenji, SATO Mineo

    ( 34 )   250 - 251   1999.5

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  • 環境中のトリチウム電解濃縮に関する新たな手法

    上松 和義

    化学と工業 = Chemistry and chemical industry   50 ( 7 )   1022   1997.7

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  • Estimation of Proton Mobility in HZSM-5 Type Zeolite Films by Complex Impedance Method

    KURITA Satoru, WANG Zhengbao, SANO Tsuneji, KAWAKAMKI Yusuke, UEMATSU Kzuyoshi, SATO Mineo

    NIPPON KAGAKU KAISHI   1997 ( 6 )   456 - 460   1997.6

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    Publisher:The Chemical Society of Japan  

    The delocalization of protons in HZSM-5 type zeolite films was investigated by the complex impedance method. The conductivities under various water vapor pressures were calculated from both the Cole-Cole plot analysis and the impedance at 1 kHz. The conductivity of HZSM-5 (Al) zeolite film with 170 of SiO<SUB>2</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> ratio was strongly dependent on the water vapor pressure and increased with an increase inthe vapor pressure. On the other hand, the conductivities of the silicalite film (SiO<SUB>2</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> ratio > 5000) and the pellet prepared by compressing the powdery HZSM-5 zeolite with 173 of SiO<SUB>2</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> ratio hardly increased with the water vapor pressure. The conductivities of HZSM-5 type metallosilicates (HZSM-5 (Ga) and HZSM-5 (Fe)) films were also measured. From the results obtained, it was concluded that (1) the acidic sites associated with the framework aluminums are the active centers for the proton conductivity, (2) adsorbed water molecules are responsible for the conduction and (3) the polycrystalline zeolite film is very effective for estimation of proton mobility.

    DOI: 10.1246/nikkashi.1997.456

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  • Preparation of Lithium Ion Conducting Thin Films by Sol-gel Method

    SATO M., UEMATSU K., OHARA Y.

    ( 30 )   28 - 29   1997.5

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  • Single crystal growth and structure determination and of a new oxyapatite NaLa_9Ge_6O_<26> Luminescent properties of Na(La_<1-x>Eux)_9Ge_6O_<26>

    TAKAHASHI M., YE Zuo-Guang, UEMATSU K., SATO M.

    ( 30 )   170 - 171   1997.5

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  • Tritium Enrichment by Electrolysis Using Solid Polymer Electrolyte.

    UEMATSU Kazuyoshi, YAMAZAKI Hisashi, SATO Mineo

    RADIOISOTOPES   45 ( 6 )   375 - 377   1996.6

  • Preparation and ionic conductivity of LiYSiO_4 thin film by sol-gel method

    SATO M., UEDA H., UEMATSU K.

    ( 28 )   180 - 181   1996.5

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  • ESR Characteristics of metal sulfate crystals doped with rare earth ions

    HAYAKAWA T., UEMATSU K., OHTA M.

    ( 26 )   100 - 101   1995.5

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  • Preparation of Barium Sulfate Phosphor by Spray Method and Luminescence Property

    KURAHARA T., UEMATSU K., OHTA M.

    ( 26 )   114 - 115   1995.5

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  • アンチモン酸薄膜の作成と導電特性

    上松 和義, 佐藤 亮介, 太田 雅壽, 佐藤 峰夫

    電気化学および工業物理化学   62 ( 8 )   717 - 719   1994.8

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    Language:Japanese   Publisher:公益社団法人 電気化学会  

    記事分類: 化学・化学工業--無機化学・無機化学工業

    DOI: 10.5796/electrochemistry.62.717

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  • Structure Determination and Silver Ion Condcutivity of Layered Perovskite compounds M2La2Ti3010 (M=K and Ag)

    SATO Mineo, TODA Kenji, WATANABE Jun, UEMATSU Kazuyoshi

    NIPPON KAGAKU KAISHI   1993 ( 5 )   640 - 646   1993.5

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    A layered perovskite compound, Ag2La2Ti3010was newly synthesized by an ion exchange reaction of IC2La2Ti8010 with AgNO3 molten salt. The crystal structures of parent compounds K2La2Ti3010. xH20 (x=0, 2) and Ag2La2Ti301were determined by Rietveld analysis. All of the structures were analogous to that of Ruddlesden-Popper phase with a tetragonal crystal system. Although the anhydrous K2La2Ti3010 and Ag2La2Ti3010 had almost the same crystal structure, a drastic difference in the bond character of M-0 (M=K, Ag) was observed between the two compounds, i. e., completely ionic character for the K-0 bond and relatively strong covalent character for the Ag-O bond along the direction of c axis. Such a covalent bond character in Ag2La2Ti3010 was reflected to the conductivity behavior. An almost pure ion conduction of silver was observed at the temperatures below 200 °C, while the mixed conduction with silver ion tranport number of 0.5 was observed over this temperature.

    DOI: 10.1246/nikkashi.1993.640

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  • X線回折用試料台の工夫

    上松 和義

    化学と工業 = Chemistry and chemical industry   45 ( 8 )   1428   1992.8

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  • Separation of HT and HTO in the atmosphere with porous Vycor glass tube.

    SAKAGUCHI Masakazu, OHTA Masatoshi, UEMATSU Kazuyoshi, WAKAMOTO Akira

    RADIOISOTOPES   34 ( 4 )   207 - 213   1985

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    Language:Japanese   Publisher:Japan Radioisotope Association  

    <I>The continuous selective monitoring of tritium gas (HT) in the air containing HT and tritiated water vapor (HTO) was investigated by using the separation cell made of porous Vycor glass tube. On admitting the air containing HT or HTO into the separation cell, HT permeated immediately through the Vycor tube depending on the partial pressure, however, HTO permeated very slowly through the Vycor tube after initial induction period. The initial induction period was elongated with a rise of the temperature of separation cell and then the permeability of HTO decreased remarkably. In the air containing HT and water vapor, the permeation of HT through the Vycor tube was considerably restricted by the water vapor adsorbed on the Vycor tube at lower temperature (at 25°C) but it was hardly affected by water vapor at higher temperature (>50°C) since water vapor was difficult to adsorb on the Vyeor tube. These results indicated that HT in the air containing HT and water vapor can be continuously monitored by using the separation cell made of the porous Vycor glass tube.</I>

    DOI: 10.3769/radioisotopes.34.4_207

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    戸田 健司, 佐藤 峰夫, 上松 和義, 福岡 宏文, 福田 健

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    Application no:特願2020-087415  Date applied:2020.5

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    Patent/Registration no:特許第6975435号  Date registered:2021.11 

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    戸田 健司, 佐藤 峰夫, 上松 和義

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    Application no:特願2018-101820  Date applied:2018.5

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    戸田 健司, 佐藤 峰夫, 上松 和義, 福岡 宏文, 福田 健

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    戸田 健司, 佐藤 峰夫, 上松 和義, 金 善旭, 椿 善太郎

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    Application no:特願2015-069896  Date applied:2015.3

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    Patent/Registration no:特許第6493793号  Date registered:2019.3 

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    大川 浩一, 佐藤 峰夫, 上松 和義

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    Application no:特願2014-058799  Date applied:2014.3

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    Patent/Registration no:特許第6646922号  Date registered:2020.1 

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    大川 浩一, 佐藤 峰夫, 上松 和義

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    Application no:特願2014-058798  Date applied:2014.3

    Announcement no:特開2015-183206  Date announced:2015.10

    Patent/Registration no:特許第6317606号  Date registered:2018.4 

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  • リン酸塩蛍光体及びリン酸塩蛍光体の製造方法

    戸田 健司, 佐藤 峰夫, 上松 和義, 石垣 雅

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    Application no:JP2014055633  Date applied:2014.3

    Publication no:WO2014-136840  Date published:2014.9

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    戸田 健司, 佐藤 峰夫, 上松 和義, 金 善旭

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    Application no:特願2014-010838  Date applied:2014.1

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    戸田 健司, 佐藤 峰夫, 上松 和義, 金 善旭

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    戸田 健司, 佐藤 峰夫, 上松 和義, 金 善旭

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    Announcement no:特開2015-137328  Date announced:2015.7

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  • リン酸塩系白色蛍光体

    戸田 健司, 佐藤 峰夫, 上松 和義, 金 善旭

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    戸田 健司, 佐藤 峰夫, 上松 和義, 金 善旭

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    Application no:特願2013-217914  Date applied:2013.10

    Announcement no:特開2015-078334  Date announced:2015.4

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    Application no:特願2013-188499  Date applied:2013.9

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    Patent/Registration no:特許第6256868号  Date registered:2017.12 

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    戸田 健司, 佐藤 峰夫, 上松 和義, 石垣 雅

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    Application no:特願2013-176057  Date applied:2013.8

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  • リン酸塩蛍光体、リン酸塩蛍光体の製造方法及びリン酸塩蛍光体を含んだ光源

    戸田 健司, 佐藤 峰夫, 上松 和義, 石垣 雅

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    Applicant:国立大学法人 新潟大学

    Application no:特願2013-043811  Date applied:2013.3

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    Application no:特願2013-042034  Date applied:2013.3

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    Applicant:国立大学法人 新潟大学

    Application no:特願2012-246977  Date applied:2012.11

    Announcement no:特開2014-095029  Date announced:2014.5

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  • リン酸塩蛍光体

    佐藤 峰夫, 戸田 健司, 上松 和義, 石垣 雅

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    Applicant:国立大学法人 新潟大学

    Application no:特願2012-043025  Date applied:2012.2

    Announcement no:特開2013-177523  Date announced:2013.9

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  • 結晶性物質の製造方法

    戸田 健司, 上松 和義, 佐藤 峰夫, 石垣 雅, 川上 義貴, 梅田 鉄

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    Applicant:国立大学法人 新潟大学

    Application no:特願2011-263597  Date applied:2011.12

    Announcement no:特開2012-132000  Date announced:2012.7

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  • 結晶性物質、並びにそれを用いた発光装置及び白色LED

    戸田 健司, 上松 和義, 佐藤 峰夫, 石垣 雅, 川上 義貴, 梅田 鉄

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    Applicant:国立大学法人 新潟大学

    Application no:特願2011-263596  Date applied:2011.12

    Announcement no:特開2012-131999  Date announced:2012.7

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  • 黄色蛍光体及びその製造方法

    戸田 健司, 上松 和義, 佐藤 峰夫, 石垣 雅, 川上 義貴, 梅田 鉄

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    Applicant:国立大学法人 新潟大学

    Application no:特願2011-240270  Date applied:2011.11

    Announcement no:特開2012-117049  Date announced:2012.6

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  • ケイ酸塩系蛍光体及びケイ酸塩系蛍光体の製造方法

    戸田 健司, 佐藤 峰夫, 上松 和義, 石垣 雅, 須田 秀生, 嶺岸 悦子, 工藤 嘉昭

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    Applicant:国立大学法人 新潟大学

    Application no:JP2011059090  Date applied:2011.4

    Publication no:WO2011-129331  Date published:2011.10

    Patent/Registration no:特許第4849498号  Date registered:2011.10 

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  • 蛍光体の製造方法

    戸田 健司, 佐藤 峰夫, 上松 和義, 石垣 雅, 川添 博文, 美濃輪 武久, 福岡 宏文, 綿谷 和浩, 高井 康

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    Applicant:国立大学法人 新潟大学

    Application no:特願2011-006110  Date applied:2011.1

    Announcement no:特開2012-153737  Date announced:2012.8

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  • 黄色蛍光体およびその製造方法

    戸田 健司, 上松 和義, 佐藤 峰夫, 石垣 雅, 川上 義貴, 梅田 鉄

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    Applicant:国立大学法人 新潟大学

    Application no:特願2010-269353  Date applied:2010.12

    Announcement no:特開2012-116980  Date announced:2012.6

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  • ケイ素含有蛍光体の製造方法

    戸田 健司, 佐藤 峰夫, 上松 和義, 石垣 雅

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    Applicant:国立大学法人 新潟大学

    Application no:特願2010-249682  Date applied:2010.11

    Announcement no:特開2012-102183  Date announced:2012.5

    Patent/Registration no:特許第5750774号  Date registered:2015.5 

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  • SiOxを用いた蛍光体の被覆方法

    戸田 健司, 佐藤 峰夫, 上松 和義, 石垣 雅

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    Applicant:国立大学法人 新潟大学

    Application no:特願2010-249683  Date applied:2010.11

    Announcement no:特開2012-102184  Date announced:2012.5

    Patent/Registration no:特許第5750775号  Date registered:2015.5 

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  • Liイオン電池用正極活物質およびその製造方法

    佐藤 峰夫, 上松 和義, 辻 洋悦, 戸田 健司, 石垣 雅, 大川 浩一

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    Applicant:国立大学法人 新潟大学

    Application no:特願2010-073965  Date applied:2010.3

    Announcement no:特開2011-210376  Date announced:2011.10

    Patent/Registration no:特許第5765798号  Date registered:2015.6 

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  • Liイオン電池用正極活物質、およびその製造方法

    塚田 博一, 今井 浩之, 大川 浩一, 佐藤 峰夫, 上松 和義, 佐藤 千紘

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    Applicant:三菱マテリアル株式会社

    Application no:特願2010-073501  Date applied:2010.3

    Announcement no:特開2011-204638  Date announced:2011.10

    Patent/Registration no:特許第5552709号  Date registered:2014.6 

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  • バナジン酸塩の合成法

    戸田 健司, 佐藤 峰夫, 上松 和義, 石垣 雅, 戸田 彩乃

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    Applicant:国立大学法人 新潟大学

    Application no:特願2009-160521  Date applied:2009.7

    Announcement no:特開2011-016670  Date announced:2011.1

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  • 蛍光剤及びその製造方法、並びに蛍光層形成用組成物、蛍光層及び発光装置

    戸田 健司, 佐藤 峰夫, 上松 和義, 石垣 雅, 川上 義貴, 梅田 鉄

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    Applicant:国立大学法人 新潟大学

    Application no:特願2009-126899  Date applied:2009.5

    Announcement no:特開2010-275371  Date announced:2010.12

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  • 蛍光体、蛍光層形成用組成物、蛍光層及び発光装置

    戸田 健司, 佐藤 峰夫, 上松 和義, 石垣 雅, 川上 義貴, 梅田 鉄

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    Applicant:国立大学法人 新潟大学

    Application no:特願2009-126893  Date applied:2009.5

    Announcement no:特開2010-275370  Date announced:2010.12

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  • 蛍光体及びそれを製造する方法、並びに蛍光層形成用組成物、蛍光層及び発光装置

    戸田 健司, 佐藤 峰夫, 上松 和義, 石垣 雅, 川上 義貴, 梅田 鉄

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    Applicant:国立大学法人 新潟大学

    Application no:特願2009-126901  Date applied:2009.5

    Announcement no:特開2010-275372  Date announced:2010.12

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  • 蛍光体及び蛍光体含有組成物、並びに、それを用いた発光装置、照明装置及び画像表示装置

    戸田 健司, 佐藤 峰夫, 石垣 雅, 上松 和義, 関 聡美, 下村 康夫

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    Applicant:国立大学法人 新潟大学

    Application no:特願2008-296931  Date applied:2008.11

    Announcement no:特開2010-121068  Date announced:2010.6

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  • 近紫外線励起発光素子用蛍光体

    戸田 健司, 上松 和義, 佐藤 峰夫, 伊藤 豊, 梅田 鉄

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    Applicant:国立大学法人 新潟大学

    Application no:特願2008-071108  Date applied:2008.3

    Announcement no:特開2009-227700  Date announced:2009.10

    Patent/Registration no:特許第4594407号  Date registered:2010.9 

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  • 蛍光体およびその製造方法

    戸田 健司, 上松 和義, 佐藤 峰夫, 伊藤 豊, 梅田 鉄

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    Applicant:国立大学法人 新潟大学

    Application no:特願2008-071109  Date applied:2008.3

    Announcement no:特開2009-227701  Date announced:2009.10

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  • アルコール濃度センサ

    上松 和義, 佐藤 峰夫, 戸田 健司, 前野 起男, 長谷川 由

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    Applicant:国立大学法人 新潟大学

    Application no:特願2007-248733  Date applied:2007.9

    Announcement no:特開2009-079974  Date announced:2009.4

    Patent/Registration no:特許第5092161号  Date registered:2012.9 

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  • 空気中のラドン及びトロンの測定方法

    上松 和義, 佐藤 峰夫, 太田 雅壽, 戸田 健司

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    Applicant:国立大学法人 新潟大学

    Application no:特願2008-520124  Date applied:2006.12

    Publication no:WO2007-141895  Date published:2007.12

    Patent/Registration no:特許第4649670号  Date registered:2010.12 

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  • 酸化チタンの製造法

    戸田 健司, 佐藤 峰夫, 上松 和義, 松本 貴子, 中島 沙絵

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    Applicant:国立大学法人 新潟大学

    Application no:特願2006-249441  Date applied:2006.9

    Announcement no:特開2008-069039  Date announced:2008.3

    Patent/Registration no:特許第4581093号  Date registered:2010.9 

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  • 発光ダイオード用蛍光体

    戸田 健司, 佐藤 峰夫, 上松 和義, 高坂 真一郎

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    Applicant:国立大学法人 新潟大学

    Application no:特願2006-248748  Date applied:2006.9

    Announcement no:特開2008-069250  Date announced:2008.3

    Publication no:WO2007-029369  Date published:2007.3

    Patent/Registration no:特許第4752067号  Date registered:2011.6 

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  • 窒化物又は酸窒化物の製造法

    戸田 健司, 佐藤 峰夫, 上松 和義, 松本 貴子

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    Applicant:国立大学法人 新潟大学

    Application no:特願2006-248745  Date applied:2006.9

    Announcement no:特開2008-069035  Date announced:2008.3

    Patent/Registration no:特許第5124767号  Date registered:2012.11 

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  • ニオブ酸カリウムの低温製膜法

    戸田 健司, 上松 和義, 佐藤 峰夫, 飯田 晃弘

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    Applicant:国立大学法人 新潟大学

    Application no:特願2006-244764  Date applied:2006.9

    Announcement no:特開2008-063198  Date announced:2008.3

    Patent/Registration no:特許第4474553号  Date registered:2010.3 

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  • エレクトロルミネッセンス蛍光体

    戸田 健司, 佐藤 峰夫, 上松 和義, 鳥阪 晶子

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    Applicant:国立大学法人 新潟大学

    Application no:特願2006-210226  Date applied:2006.8

    Announcement no:特開2008-037899  Date announced:2008.2

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  • 紫外発光長残光蛍光体

    細梅 雅史, 戸田 健司, 上松 和義, 佐藤 峰夫

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    Applicant:国立大学法人 新潟大学

    Application no:JP2006312832  Date applied:2006.6

    Publication no:WO2007-034609  Date published:2007.3

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  • 蛍光体用複合酸化物および蛍光体

    戸田 健司, 佐藤 峰夫, 上松 和義, 伊藤 豊, 小廣 健司, 土田 良彦

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    Applicant:国立大学法人 新潟大学

    Application no:特願2006-078273  Date applied:2006.3

    Announcement no:特開2007-254517  Date announced:2007.10

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  • タンタル系酸窒化物光触媒及びその製造方法

    戸田 健司, 佐藤 峰夫, 上松 和義, 松本 貴子

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    Applicant:国立大学法人 新潟大学

    Application no:特願2005-379575  Date applied:2005.12

    Announcement no:特開2007-175659  Date announced:2007.7

    Patent/Registration no:特許第4437230号  Date registered:2010.1 

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  • ニオブ酸カリウム単結晶の合成方法

    戸田 健司, 佐藤 峰夫, 上松 和義, 飯田 晃弘

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    Applicant:国立大学法人 新潟大学

    Application no:特願2005-317464  Date applied:2005.10

    Announcement no:特開2007-119327  Date announced:2007.5

    Patent/Registration no:特許第4599562号  Date registered:2010.10 

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  • 蓄光性蛍光体

    上松 和義, 戸田 健司, 佐藤 峰夫

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    Applicant:国立大学法人 新潟大学

    Application no:特願2005-270684  Date applied:2005.9

    Announcement no:特開2007-077365  Date announced:2007.3

    Patent/Registration no:特許第4362591号  Date registered:2009.8 

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  • 蛍光体

    戸田 健司, 佐藤 峰夫, 上松 和義, 米野 憲, 小廣 健司, 土田 良彦

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    Applicant:国立大学法人 新潟大学

    Application no:特願2005-268013  Date applied:2005.9

    Announcement no:特開2007-077307  Date announced:2007.3

    Patent/Registration no:特許第4966530号  Date registered:2012.4 

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  • 複合金属酸窒化物GaN-ZnO光触媒の製造方法

    戸田 健司, 堀田 憲康, 佐藤 峰夫, 上松 和義, 山中 善臣

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    Applicant:独立行政法人科学技術振興機構

    Application no:特願2004-306474  Date applied:2004.10

    Announcement no:特開2006-116415  Date announced:2006.5

    Patent/Registration no:特許第4038205号  Date registered:2007.11 

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  • 発光材料およびそれを用いた発光材料利用装置

    櫻場 大樹, 戸田 健司, 上松 和義, 佐藤 峰夫

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    Applicant:株式会社新潟ティーエルオー

    Application no:特願2003-209550  Date applied:2003.8

    Announcement no:特開2005-075838  Date announced:2005.3

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Research Projects

  • Research on the New Method to Precipitate Green Tuff Suspension using Ultrasound Irradiation

    Grant number:19760586

    2007 - 2008

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Research category:Grant-in-Aid for Young Scientists (B)

    Awarding organization:Japan Society for the Promotion of Science

    OKAWA Hirokaz, KAWAMURA Youhei, SATO Mineo, UEMATSU Kazuyoshi, SASAKI Kyuro, KODA Shinobu, YASUDA Keiji, SUGAWARA Katsuyasu

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    Grant amount:\3400000 ( Direct Cost: \3100000 、 Indirect Cost:\300000 )

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  • Development of Synthetic Reactions for Functional Inorganic Materials by Microwave Heating

    Grant number:18350104

    2006 - 2008

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

    SATO Sato, UEMATSU Kazuyoshi, TODA Kenji

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    Grant amount:\11740000 ( Direct Cost: \10600000 、 Indirect Cost:\1140000 )

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  • チェレンコフ光を利用した大気中ラドンの新規測定方法の開発

    Grant number:17656304

    2005 - 2006

    System name:科学研究費助成事業 萌芽研究

    Research category:萌芽研究

    Awarding organization:日本学術振興会

    上松 和義, 佐藤 峰夫, 太田 雅壽, 戸田 健司

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    Grant amount:\1100000 ( Direct Cost: \1100000 )

    本研究はラドンおよびトロンの壊変過程に高エネルギーベータ線を放出する核種が存在することに着目したものである.昨年度までの研究の結果,(1)検出素子には多孔質ガラス吸着剤を冷却して用いることにより空気中のラドン・トロンを吸着濃縮できる,(2)吸着剤には透光性のある石英質の多孔質ガラスや多孔質の高分子材料(ポリスチレンなど)が使用できる,(3)液体シンチレーターを使用しないためトルエンなどの有害有機廃液がでない,(4)測定には汎用的な液体シンチレーション計測装置が使用可能である,(5)娘核種ではなくラドン・トロンを直接捕集するので実際のラドン・トロン濃度の測定が可能である,(6)減衰時間の違いからラドンとトロンの区別及びその混合割合が測定可能である,(7)検出素子は吸着したラドン・トロンの娘核種の減衰を待つことにより繰り返し使用が可能である,などの特徴を有することが明らかとなった.
    本年度は,大気を採取する際に適当な容積のバッファタンク(減衰のためのタンク)を設けることにより,トロンを除去してラドンのみを正確に測定できることを見いだした.
    以上の結果を基に国内の特許を出願した.さらにこれを基に,国際出願を行った.
    実際の大気中のラドン濃度を測定するには濃度の検定が必要となる.そこで,シンチレーションセル方式のラドン測定装置の測定値と比較しながら,検出効率の導出を行った.さらに,正確な検出効率を決定するため,(独)放射線医学総合研究所に整備されているラドン施設(ラドンの基準濃度が得られる施設)において実験を行った.
    実証のための試験として,当学部の実験室,会議室および地下室においてラドン濃度の測定を行った.その結果30〜180Bq/m^3の範囲の結果が得られ,本測定方法が実用的であることが実証された.

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  • 家庭用電子レンジを用いた無機蛍光体の急速合成

    Grant number:15919040

    2003

    System name:科学研究費助成事業 奨励研究

    Research category:奨励研究

    Awarding organization:日本学術振興会

    上松 和義

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    Grant amount:\240000 ( Direct Cost: \240000 )

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  • 学生実験における無機合成反応時間短縮化の追究

    Grant number:13915018

    2001

    System name:科学研究費助成事業 奨励研究(B)

    Research category:奨励研究(B)

    Awarding organization:日本学術振興会

    上松 和義

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    Grant amount:\210000 ( Direct Cost: \210000 )

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  • 固体プロトン伝導体を用いたトリチウム水の電解濃縮

    Grant number:07919037

    1995

    System name:科学研究費助成事業 奨励研究(B)

    Research category:奨励研究(B)

    Awarding organization:日本学術振興会

    上松 和義

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    Grant amount:\210000 ( Direct Cost: \210000 )

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  • ラジオアイソトープを用いた学生実験用装置の試作に関する研究

    Grant number:04915026

    1992

    System name:科学研究費助成事業 奨励研究(B)

    Research category:奨励研究(B)

    Awarding organization:日本学術振興会

    上松 和義

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    Grant amount:\200000 ( Direct Cost: \200000 )

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Teaching Experience

  • 安全工学基礎

    2022
    Institution name:新潟大学

  • 薬品安全管理技術

    2022
    Institution name:新潟大学