| Wang Peng,Song Jun,Tian Hua,Lu Qi-fei,Wang Da-jian.Thermal stability of luminous YAG: Ce bulk ceramic as a remote phosphor prepared through silica-stabilizing valence of activator in air[J].Optoelectronics Letters,2012,8(3):201-204 |
| Thermal stability of luminous YAG: Ce bulk ceramic as a remote phosphor prepared through silica-stabilizing valence of activator in air |
| Author Name | Affiliation | | Wang Peng | Institute of Materials Physics, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin
300384, China | | Song Jun | Institute of Materials Physics, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin
300384, China | | Tian Hua | Institute of Materials Physics, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384, China；Tianjin Key Lab for Photoelectronic Materials & Devices, Tianjin University of Technology, Tianjin 300384, China | | Lu Qi-fei | Key Lab of Display Materials & Photoelectric Devices, Ministry of Education, Tianjin University of Technology, Tianjin
300384, China | | Wang Da-jian | Institute of Materials Physics, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin
300384, China；Key Lab of Display Materials & Photoelectric Devices, Ministry of Education, Tianjin University of Technology, Tianjin
300384, China；Tianjin Key Lab for Photoelectronic Materials & Devices, Tianjin University of Technology, Tianjin 300384, China |
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| Abstract: |
| A prototype 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 Ce4+ to Ce3+ even in the absence of reductive atmosphere. |
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| This work has been supported by the National Natural Science Foundation of China (Nos.50872091, 50802062, and 21076161), and the Key
Discipline for Materials Physics and Chemistry of Tianjin in China (Nos.10SYSYJC28100, 2006ZD30, and 06YFJMJC0230) |
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