Effect of electron traps on long afterglow behavior of Sr3Al2O6:Eu0.012+,Dy0.02-x3+,Hox3+ |
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| Authors: | LI Ya WANG Yinhai XIONG Yi PENG Tieqiu MO Maosong |
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| Affiliation: | 1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China; 2. Advanced Electronic Materials Institute, Gen-eral Research Institute of Nonferrous Metals, Beijing 100088, China) |
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| Abstract: | The long persistent phosphors Sr3Al2O6:Eu0.012+,Dy0.02–x3+,Hox3+ (x=0, 0.01, 0.02) were prepared by a high temperature solid state reaction. All samples showed a broad band emission peaking at ~510 nm, which could be ascribed to Eu2+ transition between 4f65d1 and 4f7 electron configurations. With the increase of substitution of Ho3+ ions for the Dy3+ ions in the as-prepared phosphors Sr3Al2O6:Eu0.012+,Dy0.02–x3+,Hox3+ (x=0, 0.01, 0.02), the initial intensity of the afterglow obviously decreased. From the thermoluminescence (TL) curves of the samples, we concluded that codoped Ho3+ ions led to a decline of the trap depth and redistribution of the trap. This may be responsible for the change of afterglow of Sr3Al2O6:Eu0.012+,Dy0.02–x3+,Hox3+ (x=0, 0.01, 0.02). |
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| Keywords: | electron transfer defect band thermoluminescence trap energy level rare earths |
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