Combustion synthesis of YAG:Ce phosphors via the thermite reaction of aluminum

Ohyama, Junpei; Zhu, Chunyu; Saito, Genki; Haga, Miki; Nomura, Takahiro; Sakaguchi, Norihito; Akiyama, Tomohiro

Combustion synthesis of YAG:Ce phosphors via the thermite reaction of aluminum

Ohyama, Junpei; Zhu, Chunyu; Saito, Genki et al.

Journal of rare earths, 2018, 36(3), 248-256

Permalink : https://hdl.handle.net/2115/76824

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アクセス権	open access
URI	https://hdl.handle.net/2115/76824
タイトル	Combustion synthesis of YAG:Ce phosphors via the thermite reaction of aluminum
著者	Ohyama, Junpei ; Zhu, Chunyu ; Saito, Genki ; Haga, Miki ; Nomura, Takahiro ; Sakaguchi, Norihito ; Akiyama, Tomohiro
著者名 Ohyama, Junpei
e-Rad_Researcher 30749255 著者名 Zhu, Chunyu
e-Rad_Researcher 00749278 著者名 Saito, Genki
著者名 Haga, Miki
e-Rad_Researcher 50714523 著者名 Nomura, Takahiro
e-Rad_Researcher 70344489 著者名 Sakaguchi, Norihito
e-Rad_Researcher 50175808 著者名 Akiyama, Tomohiro
言語	英語
キーワード	Phosphor
	Yttrium aluminum garnet
	Combustion synthesis
	Flux
	Coprecipitated material
	Rare earths
発行日	2018-03
出版者	Elsevier
収録物名	Journal of rare earths
巻(号)	36(3)
ページ	248-256
抄録	Cerium-doped yttrium aluminum garnet (YAG:Ce) as a yellow phosphor for white light-emitting diodes (LEDs) was synthesized via a facile combustion method using Y2O3, CeO2, Al2O3, Al, and NaClO4 as raw materials. The combustion synthesis approach utilizes the strong exothermic oxidation of aluminum to realize a self-sustaining reaction. In this study, we investigated the effects of the ratios of Al2O3 to Al, fluxes, and coprecipitated materials as raw materials on the luminescence properties of the synthesized YAG:Ce phosphors. When the amount of Al2O3 x is varied, the combustion reaction proceeds at x <= 1.8, with x = 1.725 being the optimum condition for producing a high-performance product. When 5 wt% BaF2 is added, the luminescence intensity is significantly improved owing to a decrease of YAP (YAlO3) formation with improved uniformity. However, the addition of CaF2 and NaF does not improve the luminescence properties. To suppress the segregation of CeO2, we used the coprecipitated material Y2O3-CeO2 as a raw material. Unlike with separate addition of Y2O3 and CeO2, Ce ions are uniformly distributed in the coprecipitated material, resulting in improved luminescence properties. The combination of BaF2 and coprecipitated material significantly improves the internal quantum efficiency to 83.0%, which is close to that of commercial phosphors. (C) 2018 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
権利情報	©2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
PISSN	1002-0721
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.jre.2017.06.014