Thermal stability of luminous YAG: Ce bulk ceramic as a remote phosphor prepared through silica-stabilizing valence of activator in air  

作　　者：王鹏 宋俊 田华 陆启飞 王达健 

机构地区：[1]Institute of Materials Physics,School of Materials Science&Engineering,Tianjin University of Technology [2]Tianjin Key Lab for Photoelectronic Materials&Devices,Tianjin University of Technology [3]Key Lab of Display Materials&Photoelectric Devices,Ministry of Education,Tianjin University of Technology

出　　处：《Optoelectronics Letters》2012年第3期201-204,共4页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.50872091, 50802062, and 21076161);the Key Discipline for Materials Physics and Chemistry of Tianjin in China (Nos.10SYSYJC28100, 2006ZD30, and 06YFJMJC0230)

摘　　要：Aprototype of YAG： Ce （Y3Al5O12） luminous bulk ceramic as a remote phosphor for white LED illumination was fabricated in air through a strategy of silica addition. With increasing the amount of silica in a specific range, the opaque sample turns to be semi-transparent. The precipitation of crystals is verified to be in pure YAG phase by X-ray diffraction （XRD）. Beyond the limit of silica amount, the dominant phase of YAG crystal is found to coexist with a small amount of newly-formed Y2Si2O7, Al2O3 and the amorphous phase. The YAG crystals are with a grain size of approximately 2 μm and distribute evenly. The YAG hosts after structural modification via addition of silica result in yellow band emission of 5d → 4f transition peaked around 535 nm as excited by a blue LED, owing to the self-reduction of Ce^4＋ to Ce^3＋ even in the absence ofreductive atmosphere.

关 键 词：Amorphous silicon Ceramic materials Light emission Light emitting diodes LUMINANCE PHOSPHORS X ray diffraction 

分 类 号：TN248[电子电信—物理电子学]