Temperature dependent luminescence of yellow-emitting α-sialon: Eu2+ oxynitride phosphors for white light-emitting diodes

被引：0
|
作者：
Liu, Lihong [1 ,2 ]
Xie, Rong-Jun [2 ]
Hirosaki, Naoto [2 ]
Takeda, Takashi [2 ]
Li, Jiguang [1 ]
Sun, Xudong [1 ]
机构：
[1] Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials and Metallurgy, Northeastern University, Liaoning 110004, China
[2] Nitride Particle Group, Nano Ceramics Center, National Institute for Materials Science, Ibaraki 305-0044, Japan
来源：
Journal of the American Ceramic Society | 2009年 / 92卷 / 11期
关键词：
Yellow-emitting α-sialon:Eu2+ phosphors have been reported as interesting down-conversion luminescent materials in white LEDs. In this work; the thermal quenching of α-sialon:Eu2+ with the compositions of Mval+(m/val+)Si12-(m+n)Al m+nOnN16-n (M=Ca; Mg; Lu) is studied by investigating the effects of chemical composition; activator concentration; and substitution cation on the temperature-dependent luminescence. The chemical composition of α-sialon:Eu2+ was varied in a wide range (0.5m2.0; 1n1.8). It shows that the m value significantly affects the thermal quenching of α-sialon; whereas the n value hardly does. This difference is ascribed to the obvious lattice expansion and the increase of absolute activator concentration as m increases. The thermal quenching increases with increasing the Eu2+ concentration; which is due to enhanced Stokes shift. The type of substitution cation also has an influence on thermal quenching. Among the substitution cations in this work; Lu-α-sialon:Eu2+ exhibits largest thermal quenching. Photoionization is considered as the mechanism for the thermal quenching of Lu-α-sialon: Eu2+. © 2009 The American Ceramic Society;
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页码：2668 / 2673
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