Thermally stable photoluminescence and long persistent luminescence of Ca3Ga4O9:Tb3+/Zn2+ |
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| Authors: | Zhangwen Long Junhe Zhou Jianbei Qiu Qi Wang Dacheng Zhou Xuhui Xu Xue Yu Hao Wu Zhencai Li |
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| Affiliation: | 1. Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;2. Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, China;3. Key Lab. of Advanced Materials of Yunnan Province, Kunming 650093, China |
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| Abstract: | A green long persistent luminescence (LPL) phosphor Ca3Ga4O9:Tb3+/Zn2+ was prepared. Ca3Ga4O9 matrix exhibits blue self-activated LPL due to the creation of intrinsic traps. When Tb3+ is doped, the photoluminescence (PL) and LPL colors change from blue to green with their intensities significantly enhanced. The doping of Zn2+ evidently improves the PL and LPL performances of the Ca3Ga4O9 matrix and Ca3Ga4O9:Tb3+. The thermoluminescence (TL) spectra show that a successive trap distribution is formed by multiple intrinsic traps with different depths in the Ca3Ga4O9 matrix, and the incorporation of Tb3+ and Zn2+ effectively increases the densities of these intrinsic traps. The existence of a successive trap distribution makes the Ca3Ga4O9:Tb3+/Zn2+ phosphor exhibit thermally stable PL and LPL. It is indicated that this phosphor shows great promise for the application such as high-temperature LPL phosphor. |
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| Keywords: | Self-activated Long persistent luminescence Successive trap distribution Thermal stability Rare earths |
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