Electron Paramagnetic Resonance and Luminescence Study of Sol-Gel Derived YAG:Cr Powder
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概要
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Electron paramagnetic resonance (EPR) and luminescence studies were carried out for the sol-gel-derived YAG:Cr powders subjected to three kinds of heat treatment processes. The results show that powders processed using the two-step heat treatment process with the addition of 20 wt% LiCl and by direct heat treatment at 1500℃ exhibit good luminescence properties. The emission spectrum for the powders obtained by the two-step process shows the R-line at 688 nm, whereas the powders directly heat treated at 1500℃ display an additional R-line of Al_2O_3 : Cr at 694 nm. EPR measurements show that the presence or absence of absorption peaks depends on the Cr^<3+> environment in the host lattice resulting from the different methods of heat treatment of the powder. The EPR spectra of YAG:Cr^<3+> phosphors were interpreted to indicate both Cr^<3+> single ion and Cr^<3+>-Cr^<3+> pair (with spin three) transitions.
- 社団法人応用物理学会の論文
- 1999-03-15
著者
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Tseng Tseung-yuen
Department Of Electronics Engineering National Chiao Tung University
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Ezhilvalavan S.
Department Of Electronics Engineering And Institute Of Electronics National Chiao-tung University
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Lo Jun-ren
Department Of Electronics Engineering And Institute Of Electronics National Chiao-tung University
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Tseng Tseung-yuen
Department Of Electronics Engineering & Institute Of Electronics National Chiao-tang University
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