Faculty Profiles - TODA Kenji

Papers - TODA Kenji

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

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

DYES AND PIGMENTS 136 243 - 247 2017.1

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCI LTD

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.

DOI： 10.1016/j.dyepig.2016.08.038

Environmentally friendly Rb3V5O14 fluorescent red pigment Reviewed

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

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCI LTD

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.

DOI： 10.1016/j.dyepig.2016.08.040

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

Language：English Publishing type：Research paper (international conference proceedings)

© 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.

DOI： 10.4028/www.scientific.net/MSF.883.17

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

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

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

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.

DOI： 10.2109/jcersj2.16325

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

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

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

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.

DOI： 10.1039/c7ra01832k

A new lanthanum(III) complex containing acetylacetone and 1 H -imidazole Reviewed

Atsuya Koizumi, Takuya Hasegawa, Atsushi Itadani, Kenji Toda, Taoyun Zhu, Mineo Sato

Acta Crystallographica Section E: Crystallographic Communications 73 1739 - 1742 2017

Language：English Publishing type：Research paper (scientific journal)

© Koizumi et al. 2017. In the title complex, diaqua(1H-imidazole-κN 3)(nitrato-κ 2 O,O′)bis(4-oxopent-2-en-2-olato-κ 2 O,O′)lanthanum(III), [La(C 5 H 7 O 2) 2 (NO 3)(C 3 H 4 N 2)(H 2 O) 2 ], the La atom is coordinated by eight O atoms of two acetylacetonate (acac) anions acting as bidentate ligands, two water molecule as monodentate ligands, one nitrate anions as a bidentate ligand and one N atom of an imidazolate (ImH) molecule as a monodentate ligand. Thus, the coordination number of the La atom is nine in a monocapped square antiprismatic polyhedron. There are three types of intermolecular hydrogen bonds between ligands, the first involving nitrate-water O⋯H - O interactions running along the [001] direction, the second involving acac-water O⋯H - O interactions along the [010] direction and the third involving an Im-nitrate N - H⋯O interaction along the [100] direction (five interactions of this type). Thus, an overall one-dimensional network structure is generated. The molecular plane of an ImH molecule is almost parallel to that of a nitrate ligand, making an angle of only 6.04(12)°. Interestingly, the ImH plane is nearly perpendicular to the planes of two neighbouring acac ligands.

DOI： 10.1107/S205698901701461X

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

Language：English Publishing type：Research paper (international conference proceedings)

© 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.

DOI： 10.4028/www.scientific.net/KEM.751.353

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

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

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

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.

DOI： 10.1246/cl.160498

Suppress of Concentration Quenching by Site Engineering Concept Reviewed

Y. Imanari, T. Hasegawa, M. Watanabe, K. Toda, T. Ishigaki, S. Kamei, S. W. Kim, K. Uematsu, M. Sato

Applied Mechanics and Materials 851 132 - 137 2016.8

Synthesis and photoluminescence properties of oxynitride phosphors M0.98Si2O2N2: Eu-0.02(2+) (M=Ba, Sr, Ca) using the cellulose assisted liquid phase precursor process Reviewed

Yelim Song, Younghyun Song, Kenji Toda, Takaki Masaki, Daeho Yoon

CERAMICS INTERNATIONAL 42 ( 8 ) 9667 - 9672 2016.6

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCI LTD

Oxynitride phosphors M0.98Si2O2N2: Eu-0.02(2+)(M=Ba, Sr, Ca) for white LEDs were synthesized at 1300,1400, and 1500 degrees C by using the partially cellulose assisted liquid phase precursor (PLPP) process and compared with solid state reaction (SSR) process. MSi2O2N2 (M=Ba, Sr, Ca) crystal structure was obtained from M0.98Si2O2N2: Eu-0.02(2+) phosphor fired at 1400 degrees C using the PLPP process. However these phosphors were not synthesized through the SSR process at same temperature. M0.98Si2O2N2: Eu-0.02(2+)(M=Ba, Sr, Ca) phosphors from PLPP produced a blue color emission at 487 nm (380 nm excitation), a green color emission at 528 nm (374 nm excitation), and a yellow color emission at 538 nm (371 nm excitation). M0.98Si2O2N2: Eu-0.02(2+) phosphors from PLPP had higher luminescence and crystallinity compared with those obtained from the SSR process. The prepared phosphors were analyzed by X-ray diffraction (XRD), photoluminescence (PL) and field-emission scanning electron microscopy (FE-SEM). (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

DOI： 10.1016/j.ceramint.2016.03.055

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

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

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCI LTD

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.

DOI： 10.1016/j.ceramint.2016.03.176

Physical studies on the enhancement of photoluminescence properties for blue BaAl2Si2O8 : Eu2+ phosphors via LPP method with addition of silicate concentrations Reviewed

Bong Sung Kim, Min Ji Lee, Takesi Abe, Takaki Masaki, Young-Hyun Song, Kenji Toda, Dae-Ho Yoon

JOURNAL OF CERAMIC PROCESSING RESEARCH 17 ( 4 ) 286 - 289 2016.4

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

BaAl2Si2O8: Eu2+ + xSiO(2) (x = 0, 1, 2 and 3) has been synthesized with phosphors via novel liquid phase precursor (LPP) method. The best crystalline BaAl2Si2O8 : Eu2+ phosphor could not be synthesized as the calcination temperature is inadequate fully to crystalize the phosphor leading to the crystal and amorphous. Albeit, the firing temperature is insufficient so as to form the fine crystal, the added excess SiO2 could act as an additive for the crystallization of the phosphor. As a function of SiO2, the size of the crystal has been augmented and formed fine crystals with the concentration of added SiO2. Moreover, the added excess SiO2 makes SiOC : Eu2+ phosphor as a deep blue illumination at 440 nm. Photoluminescence intensity of the phosphors is increased continuously by the addition of SiO2 heretofore x = 3. In the present investigation, an attempt has been made to synthesize and observe carefully for photoluminescence properties with regard to the crystalline structure, optical property and surface morphology.

Synthesis of high intensity green emitting (Ba,Sr)SiO4:Eu2+ phosphors through cellulose assisted liquid phase precursor process Reviewed

Usama Bin Humayoun, Young-Hyun Song, Minji Lee, Kakihana Masato, Hiroshi Abe, Kenji Toda, Yasushi Sato, Takaki Masaki, Dae-Ho Yoon

OPTICAL MATERIALS 51 110 - 114 2016.1

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

Green emitting phosphor (Ba1-xSr1-x)SiO4:2xEu(2+), x = 0.03, 0.05, 0.1, and 0.15 were synthesized through a Liquid Phase Precursor Process (LPP). Liquid phase precursor method is reported to result in phosphors with markedly increased emission intensities compared to other synthesis methods. Here microcrystalline cellulose (MCC) and hydroxypropyl cellulose (HPC) templates were studied to achieve high efficiency green phosphors. The phase formation was investigated by XRD analysis which showed the conformation of the Ba2SiO4 (JCPDS card number 761631) phase. The obtained samples exhibited broad excitation spectra with maximum at 430 nm and a green emission centered around 520 nm. An optimized dopant concentration was selected and the effect of two different types of cellulose, i.e. MCC and HPC templates on the emission properties was considered. It was found that the samples synthesized using HPC and fired at 1050 degrees C under a reducing atmosphere, showed a high intensity of almost 2 times that of the MCC sample. Further experiments were conducted by varying viscosity, particle weight, and molecular weight of the HPC template. It was found that the green emission from the (Ba,Sr)SiO4:Eu2+ increased with the increase in viscosity and molecular weight of the template. (C) 2015 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.optmat.2015.11.036

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

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

DALTON TRANSACTIONS 45 ( 28 ) 11554 - 11559 2016

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

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 Ti4+-O2- in the pyramidal TiO5. The obtained Ba2TiP2O9 was excited efficiently by UV and VUV and displayed a bright bluish-white luminescence.

DOI： 10.1039/c6dt01715k

Improved synthesis of SrLiAl3N4:Eu2+ phosphor using complex nitride raw material Reviewed

S. W. Kim, T. Hasegawa, S. Hasegawa, R. Yamanashi, H. Nakagawa, K. Toda, T. Ishigaki, K. Uematsu, M. Sato

RSC ADVANCES 6 ( 66 ) 61906 - 61908 2016

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

Narrow band deep-red emission SrLiAl3N4:Eu2+ phosphor was synthesized using complex nitride Sr3Al2N4 and Li3AlN2 as raw materials. The SrLiAl3N4:Eu2+ phosphor has the oxoplumbate type triclinic structure as the main phase. The phosphor exhibited deep-red emission peaking at 654 nm under excitation at 450 nm and showed an excellent thermal stability on the thermal quenching effect.

DOI： 10.1039/c6ra14107b

Novel yellowish white-emitting Eu<sup>2+</sup>-activated phosphate phosphor based on Rb<inf>2</inf>Ba<inf>3</inf>P<inf>4</inf>O<inf>14</inf> Reviewed

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

Journal of Ceramic Processing Research 17 ( 5 ) 401 - 404 2016

Language：English Publishing type：Research paper (scientific journal)

© 2016, Hanyang University. All rights reserved. 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 Rb2(Ba0.99Eu0.01)3P4O14.

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

Language：English Publishing type：Research paper (international conference proceedings)

© 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.

DOI： 10.4028/www.scientific.net/KEM.690.268

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

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

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

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

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

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

ELECTROCHEMISTRY 83 ( 10 ) 828 - 830 2015.10

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

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.

DOI： 10.5796/electrochemistry.83.828

Novel green-emitting Ho3+-doped scandate phosphors Reviewed

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

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

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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