Thermally stable photoluminescence and long persistent luminescence of Ca₃Ga₄O₉:Tb³⁺/Zn²⁺

Zhangwen Long¹，Junhe Zhou¹，Jianbei Qiu^1,2，Qi Wang^1,3，Dacheng Zhou^1,2，Xuhui Xu^1,2，Xue Yu^1,2，Hao Wu¹，Zhencai Li¹

1. Faculty of Material Science and Engineering,Kunming University of Science and Technology2. Key Lab.of Advanced Materials of Yunnan Province3. Research Center for Analysis and Measurement,Kunming University of Science and Technology

摘 要：A green long persistent luminescence（LPL） phosphor Ca₃ Ga₄ O₉:Tb³⁺/Zn²⁺ was prepared. Ca₃ Ga₄ O₉ 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 Ca₃ Ga₄ O₉ 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 Ca₃ Ga₄ O₉: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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