Combustion synthesis of Ca-alpha-SiAlON:Eu2+ phosphors with different Ca concentrations and diluent ratios

Saito, Genki; Kunisada, Yuji; Sakaguchi, Norihito; Nomura, Takahiro; Akiyama, Tomohiro

Combustion synthesis of Ca-alpha-SiAlON:Eu2+ phosphors with different Ca concentrations and diluent ratios

Saito, Genki; Kunisada, Yuji; Sakaguchi, Norihito et al.

Ceramics international, 2017, 43(15), 12396-12401

Permalink : https://hdl.handle.net/2115/75760

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アクセス権	open access
URI	https://hdl.handle.net/2115/75760
タイトル	Combustion synthesis of Ca-alpha-SiAlON:Eu2+ phosphors with different Ca concentrations and diluent ratios
著者	Saito, Genki ; Kunisada, Yuji ; Sakaguchi, Norihito ; Nomura, Takahiro ; Akiyama, Tomohiro
e-Rad_Researcher 00749278 著者名 Saito, Genki
e-Rad_Researcher 00591075 著者名 Kunisada, Yuji
e-Rad_Researcher 70344489 著者名 Sakaguchi, Norihito
e-Rad_Researcher 50714523 著者名 Nomura, Takahiro
e-Rad_Researcher 50175808 著者名 Akiyama, Tomohiro
言語	英語
キーワード	Phosphor
	Oxynitride
	SiAlON
	Combustion synthesis
発行日	2017-10-15
出版者	Elsevier
収録物名	Ceramics international
巻(号)	43(15)
ページ	12396-12401
抄録	Yellow Ca-alpha-SiAlON:Eu2+ phosphors for white light-emitting diodes (LEDs) were synthesized by a facile combustion synthesis method using CaO, Eu2O3, alpha-Si3N4, Si, and Al as raw materials. Ca concentrations and diluent ratios were optimized to improve their luminescence properties. The lattice constant and luminescence properties improved as x increased from 0.4 to 1.2 in Ca(x)Si(12-(m+n))Al(m+n)OnN(16-n):En(0.06). The optimum value was x = 1.2. Scanning transmission electron microscopy combined with energy dispersive X-ray analysis detected segregation of Ca and Eu at grain boundaries, which decreased luminescence behavior in the x = 1.4 sample. The influence of Si and Si3N4 diluents was investigated by varying the diluent ratio phi = (CaO + Eu2O3 + alpha-Si3N4)/(CaO + Eu2O3 + a-Si3N4 + Al + Si). Changes in temperature and flame propagation speed were measured during combustion synthesis using two thermocouples. When phi, was less than 0.5, the combustion temperature exceeded 1600 degrees C and the synthesized material contained an amount of the high-temperature beta-SiAlON phase. At phi > 0.7, the reaction temperature fell below 1200 degrees C, and unreacted raw materials remained. The optimum value of phi was 0.6. The internal quantum efficiency of the product synthesized at x = 1.2 and (I, = 0.6 was approximately 35% under 450-nm excitation. According to electron probe X-ray microanalysis, composition varied within individual synthesized particles, which may explain the decrease in emission behavior relative to a commercial product.
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	© 2017. 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	0272-8842
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.ceramint.2017.06.106