publication_type publication_year number author title journal_title volume_number issue_number start_page end_page doi reported_at Paper 2024 1 Yoriko Suda, Tsuyoshi Okuno, Takashi Takeda, Kohsei Takahashi, Naoto Hirosaki Journal of Physics D: Applied Physics 57 18 185101 https://doi.org/10.1088/1361-6463/ad2294 2024-04-17 00:11:27 +0900 Paper 2023 1 Kohsei Takahashi, Shin-ichi Todoroki, Takashi Takeda, Naoto Hirosaki ECS Journal of Solid State Science and Technology 12 7 076002 https://doi.org/10.1149/2162-8777/ace0da 2024-04-17 00:11:27 +0900 Paper 2023 2 Kohsei Takahashi, Takashi Takeda, Naoto Hirosaki Japanese Journal of Applied Physics 62 1 016510 https://doi.org/10.35848/1347-4065/acb2a2 2024-04-17 00:11:27 +0900 Paper 2022 1 Takashi Takeda, Shiro Funahashi, Kohsei Takahashi, Rong-Jun Xie, Naoto Hirosaki Structure elucidation of luminescent centers in green emitting Eu2+ doped Si6-zAlzOzN8-z phosphors Scripta Materialia 207 114238 https://doi.org/10.1016/j.scriptamat.2021.114238 2024-04-17 00:11:27 +0900 Paper 2021 1 Shunsuke Watanabe, Yuta Osawa, Shingo Machida, Ken-ichi Katsumata, Atsuo Yasumori, Kohsei Takahashi, Kenzo Deguchi, Shinobu Ohki, Hiroyo Segawa Investigation of luminescence properties of Eu-doped Si-Al-O-N glasses synthesized via sol-gel process Journal of Non-Crystalline Solids 573 121107 https://doi.org/10.1016/j.jnoncrysol.2021.121107 2024-04-17 00:11:27 +0900 Paper 2021 2 Jian Xu, Shiro Funahashi, Kohsei Takahashi, Takayuki Nakanishi, Naoto Hirosaki, Takashi Takeda Cyan-Emitting Sialon-Polytypoid Phosphor Discovered by a Single-Particle-Diagnosis Approach ECS Journal of Solid State Science and Technology 10 11 116002 https://doi.org/10.1149/2162-8777/ac331c 2024-04-17 00:11:27 +0900 Paper 2021 3 Peng Zheng, Shuxing Li, Takashi Takeda, Jian Xu, Kohsei Takahashi, Rundong Tian, Ran Wei, Le Wang, Tian-Liang Zhou, Naoto Hirosaki, Rong-Jun Xie Unraveling the Luminescence Quenching of Phosphors under High-Power-Density Excitation Acta Materialia 209 116813 https://doi.org/10.1016/j.actamat.2021.116813 2024-04-17 00:11:27 +0900 Paper 2021 4 Yoriko Suda, Yoshiaki Kamigaki, Hayato Miyagawa, Takashi Takeda, Kohsei Takahashi, Naoto Hirosaki Effects of Eu2+ on the luminescence and afterglow that arise from defects in β-SiAlON:Eu2+ Journal of Physics D: Applied Physics 54 6 065102 https://doi.org/10.1088/1361-6463/abc199 2024-04-17 00:11:27 +0900 Paper 2020 1 Yoriko Suda, Yoshiaki Kamigaki, Hayato Miyagawa, Takashi Takeda, Kohsei Takahashi, Naoto Hirosaki Luminescence and afterglow due to defects in β-SiAlON crystal powder Journal of Physics D: Applied Physics 53 16 165108 https://doi.org/10.1088/1361-6463/ab6ea3 2024-04-17 00:11:27 +0900 Paper 2020 2 Hiromichi Chima, Naoyuki Shiokawa, Keisuke Seto, Kohsei Takahashi, Naoto Hirosaki, Takayoshi Kobayashi, Eiji Tokunaga Thermal Relaxation Spectra for Evaluating Luminescence Quantum Efficiency of CASN:Eu2+ Measured by Balanced-Detection Sagnac-Interferometer Photothermal Deflection Spectroscopy Applied Sciences 10 3 1008 https://doi.org/10.3390/app10031008 2024-04-17 00:11:27 +0900 Paper 2019 1 Chun-Yun Wang, Takashi Takeda, Otmar Melvin ten Kate, Shiro Funahashi, Rong-Jun Xie, Kohsei Takahashi, Naoto Hirosaki New Deep-Blue-Emitting Ce-Doped A4–mBnC19+2mX29+m (A = Sr, La; B = Li; C = Si, Al; X = O, N; 0 ≤ m ≤ 1; 0 ≤ n ≤ 1) Phosphors for High-Color-Rendering Warm White Light-Emitting Diodes ACS Applied Materials & Interfaces 11 32 29047 29055 https://doi.org/10.1021/acsami.9b09982 2024-04-17 00:11:27 +0900 Paper 2019 2 Lihong Liu, Chenning Zhang, Kohsei Takahashi, Toshiyuki Nishimura, Hiroyo Segawa, Naoto Hirosaki, Rong-Jun Xie Uniform and fine Mg-γ-AlON powders prepared from MgAl2O4: A promising precursor material for highly-transparent Mg-γ-AlON ceramics Journal of the European Ceramic Society 39 4 928 933 https://doi.org/10.1016/j.jeurceramsoc.2018.10.028 2024-04-17 00:11:27 +0900 Paper 2018 1 Jumpei Ueda, Setsuhisa Tanabe, Kohsei Takahashi, Takashi Takeda, Naoto Hirosaki Thermal Quenching Mechanism of CaAlSiN3:Eu2+ Red Phosphor Bulletin of the Chemical Society of Japan 91 2 173 177 https://doi.org/10.1246/bcsj.20170307 2024-04-17 00:11:27 +0900 Paper 2017 1 Benjamin Dierre, Karine Costuas, Noée Dumait, Serge Paofai, Maria Amela-Cortes, Yann Molard, Fabien Grasset, Yujin Cho, Kohsei Takahashi, Naoki Ohashi, Tetsuo Uchikoshi, Stéphane Cordier Mo6 cluster-based compounds for energy conversion applications: comparative study of photoluminescence and cathodoluminescence Science and Technology of Advanced Materials 18 1 458 466 https://doi.org/10.1080/14686996.2017.1338496 2024-04-17 00:11:27 +0900 Paper 2017 2 Chun-Yun Wang, Takashi Takeda, Otmar Melvin ten Kate, Masataka Tansho, Kenzo Deguchi, Kohsei Takahashi, Rong-Jun Xie, Tadashi Shimizu, Naoto Hirosaki Ce-Doped La3Si6.5Al1.5N9.5O5.5, a Rare Highly Efficient Blue-Emitting Phosphor at Short Wavelength toward High Color Rendering White LED Application ACS Applied Materials & Interfaces 9 27 22665 22675 https://doi.org/10.1021/acsami.7b03909 2024-04-17 00:11:27 +0900 Paper 2017 3 Kenichi Yoshimura, Hiroshi Fukunaga, Makoto Izumi, Masamichi Harada, Kohsei Takahashi, Hiroyo Segawa, Rong-Jun Xie, Naoto Hirosaki Optical properties of green-emitting β-sialon:Eu phosphor-containing silica glasses and their deterioration mechanism Japanese Journal of Applied Physics 56 6 060302 https://doi.org/10.7567/jjap.56.060302 2024-04-17 00:11:27 +0900 Paper 2017 4 Le Wang, Xiao-Jun Wang, Kohsei Takahashi, Takashi Takeda, Naoto Hirosaki, Rong-Jun Xie Nitride phosphors as robust emissive materials in white flat field emission lamps Optical Materials Express 7 6 1934 https://doi.org/10.1364/ome.7.001934 2024-04-17 00:11:27 +0900 Paper 2017 5 Kenichi Yoshimura, Hiroshi Fukunaga, Makoto Izumi, Kohsei Takahashi, Rong-Jun Xie, Naoto Hirosaki, Kenichi Yoshimura, Hiroshi Fukunaga, Makoto Izumi, TAKAHASHI, Kohsei, XIE, Rong-Jun, HIROSAKI, Naoto Achieving superwide-color-gamut display by using narrow-band green-emitting γ-AlON:Mn,Mg phosphor Japanese Journal of Applied Physics 56 4 041701 2024-04-17 00:11:27 +0900 Paper 2017 6 Kenichi Yoshimura, Hiroshi Fukunaga, Makoto Izumi, Kohsei Takahashi, Rong-Jun Xie, Naoto Hirosaki Achieving superwide-color-gamut display by using a narrow-band green-emitting γ-AlON:Mn, Mg phosphor Japanese Journal of Applied Physics 56 4 041701 https://doi.org/10.7567/jjap.56.041701 2024-04-17 00:11:27 +0900 Paper 2016 1 Yujin Cho, Benjamin Dierre, Takashi Sekiguchi, Takayuki Suehiro, Kohsei Takahashi, Takashi Takeda, Rong-Jun Xie, Yoshinobu Yamamoto, Naoto Hirosaki Low-energy Cathodoluminescence for (Oxy)Nitride phosphors Journal of Visualized Experiments 117 https://doi.org/10.3791/54249 2024-04-17 00:11:27 +0900 Paper 2016 2 Chun-Yun Wang, Takashi Takeda, Otmar Melvin ten Kate, Rong-Jun Xie, Kohsei Takahashi, Naoto Hirosaki Synthesis and photoluminescence properties of a phase pure green-emitting Eu doped JEM sialon (LaSi6－zAl1+zN10－zOz, z ∼ 1) phosphor with a large red-shift of emission and unusual thermal quenching behavior Journal of Materials Chemistry C 4 43 10358 10366 https://doi.org/10.1039/c6tc02229d 2024-04-17 00:11:27 +0900 Paper 2016 3 Kenichi Yoshimura, Hiroshi Fukunaga, Makoto Izumi, Masatsugu Masuda, Toyonori Uemura, Kohsei Takahashi, Rong-Jun Xie, Naoto Hirosaki White LEDs using the sharp β-sialon: Eu phosphor and Mn-doped red phosphor for wide-color gamut display applications Journal of the Society for Information Display 24 7 449 453 https://doi.org/10.1002/jsid.462 2024-04-17 00:11:27 +0900 Paper 2016 4 Kenichi Yoshimura, Kazunori Annen, Hiroshi Fukunaga, Masamichi Harada, Makoto Izumi, Kohsei Takahashi, Tetsuo Uchikoshi, Rong-Jun Xie, Naoto Hirosaki Optical properties of solid-state laser lighting devices using SiAlON phosphor–glass composite films as wavelength converters Japanese Journal of Applied Physics 55 4 042102 https://doi.org/10.7567/jjap.55.042102 2024-04-17 00:11:27 +0900 Paper 2016 5 Yujin Cho, Benjamin Dierre, Naoki Fukata, Naoto Hirosaki, Kazuhiro Marumoto, Donghyun Son, Kohsei Takahashi, Takashi Takeda, Takashi Sekiguchi Defects and luminescence control of AlN ceramic by Si-doping Scripta Materialia 110 109 112 https://doi.org/10.1016/j.scriptamat.2015.08.013 2024-04-17 00:11:27 +0900 Paper 2016 6 Thai Giang Truong, Benjamin Dierre, Fabien Grasset, Noriko Saito, Norio Saito, Thi Kim Ngan Nguyen, Kohsei Takahashi, Tetsuo Uchikoshi, Marian Amela-Cortes, Yann Molard, Stéphane Cordier, Naoki Ohashi Visible tunable lighting system based on polymer composites embedding ZnO and metallic clusters: from colloids to thin films Science and Technology of Advanced Materials 17 1 443 453 https://doi.org/10.1080/14686996.2016.1202724 2024-04-17 00:11:27 +0900 Paper 2015 1 Le Wang, Xiaojun Wang, Takahashi Kohsei, Ken-ichi Yoshimura, Makoto Izumi, Naoto Hirosaki, Rong-Jun Xie Highly efficient narrow-band green and red phosphors enabling wider color-gamut LED backlight for more brilliant displays Optics Express 23 22 28707 https://doi.org/10.1364/oe.23.028707 2024-04-17 00:11:27 +0900 Paper 2015 2 Kohsei Takahashi, Benjamin Dierre, Yujin Cho, Takashi Sekiguchi, Rong-Jun Xie, Naoto Hirosaki, H. T. J. M. Hintzen Ca同時ドープLaAl(Si6-zAlz)(N10-zOz)(z~1):Ce3+ 青色蛍光体の顕微解析 Journal of the American Ceramic Society 98 4 1253 1258 https://doi.org/10.1111/jace.13470 2024-04-17 00:11:27 +0900 Paper 2014 1 Yujin Cho, Benjamin Dierre, Takashi Takeda, Kohsei Takahashi, Naoto Hirosaki, Takashi Sekiguchi Influence of Si on the particle growth of AlN ceramics Applied Physics Express 7 11 115503 https://doi.org/10.7567/apex.7.115503 2024-04-17 00:11:27 +0900 Paper 2013 1 Benjamin Dierre, Takashi Takeda, Takashi Sekiguchi, Takayuki Suehiro, Kohsei Takahashi, Yoshinobu Yamamoto, Rong-Jun Xie, Naoto Hirosaki Local analysis of Eu2+ emission in CaAlSiN3 Science and Technology of Advanced Materials 14 6 064201 https://doi.org/10.1088/1468-6996/14/6/064201 2024-04-17 00:11:27 +0900 Paper 2012 1 Kohsei Takahashi, Ken-ichi Yoshimura, Masamichi Harada, Yoshitaka Tomomura, Takashi Takeda, Rong-Jun Xie, Naoto Hirosaki On the origin of fine structure in the photoluminescence spectra of the β-sialon:Eu2+green phosphor Science and Technology of Advanced Materials 13 1 015004 https://doi.org/10.1088/1468-6996/13/1/015004 2024-04-17 00:11:27 +0900 Paper 2011 1 Kohsei Takahashi, Rong-Jun Xie, Naoto Hirosaki Toward Higher Color Purity and Narrower Emission Band β-sialon:Eu2+ by Reducing the Oxygen Concentration Electrochemical and Solid-State Letters 14 11 E38 https://doi.org/10.1149/2.017111esl 2024-04-17 00:11:27 +0900 Paper 2007 1 Kohsei Takahashi, Naoto Hirosaki, Rong-Jun Xie, Masamichi Harada, Ken-ichi Yoshimura, Yoshitaka Tomomura Luminescence properties of blue La1-xCexAl(Si6-zAlz)(N10-zOz)(z=1) oxynitride phosphors and their application in white light-emitting diode Applied Physics Letters 91 9 091923 https://doi.org/10.1063/1.2779093 2024-04-17 00:11:27 +0900 Paper 2006 1 Rong-Jun Xie, Naoto Hirosaki, Mamoru Mitomo, Kosei Takahashi, Ken Sakuma Applied Physics Letters 88 10 101104 https://doi.org/10.1063/1.2182067 2024-04-17 00:11:27 +0900