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

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Title: Combustion synthesis of YAG:Ce phosphors via the thermite reaction of aluminum
Authors: Ohyama, Junpei Browse this author
Zhu, Chunyu Browse this author →KAKEN DB
Saito, Genki Browse this author →KAKEN DB
Haga, Miki Browse this author
Nomura, Takahiro Browse this author →KAKEN DB
Sakaguchi, Norihito Browse this author →KAKEN DB
Akiyama, Tomohiro Browse this author →KAKEN DB
Keywords: Phosphor
Yttrium aluminum garnet
Combustion synthesis
Flux
Coprecipitated material
Rare earths
Issue Date: Mar-2018
Publisher: Elsevier
Journal Title: Journal of rare earths
Volume: 36
Issue: 3
Start Page: 248
End Page: 256
Publisher DOI: 10.1016/j.jre.2017.06.014
Abstract: 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.
Rights: ©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/
https://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/76824
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 齊藤 元貴

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