Abstract Pr3+/Gd3+ co-doped LiNbO3 phosphors were prepared by a traditional solid-state reaction method and their structure, photoluminescence, mechanoluminescence and thermoluminescence were investigated. The results showed that the LiNbO3 phase with a rhombohedral structure and an R3c space group was successfully prepared. Mechanoluminescence intensity in nonstoichiometric LiNbO3:Pr3+ was largely increased by introducing Gd3+ ions. The optimal co-doped concentration of Gd3+ was 1 mol% and the enhanced ML intensity of LiNbO3:0.01Pr3+, 0.01Gd3+ was about 177% times compared with that of LiNbO3:0.01Pr3+. The effect of Gd3+ co-dopants on trap levels were explored through thermoluminescence curves. The enhancement of mechanoluminescence intensity was suggested to be ascribed to the regulated trap quantities caused by co-doped Gd3+ ions. Appropriate co-dopants are proved to be effective sensitizers for mechanoluminescence materials.

中文翻译：

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Pr 3+ /Gd 3+ 共掺杂LiNbO 3 荧光粉显着增强的机械发光特性

摘要 采用传统固相反应法制备了Pr3+/Gd3+共掺杂LiNbO3荧光粉，并对其结构、光致发光、机械致发光和热致发光进行了研究。结果表明，成功制备了具有菱面体结构和R3c空间群的LiNbO3相。通过引入 Gd3+ 离子，非化学计量的 LiNbO3:Pr3+ 中的机械发光强度大大增加。Gd3+的最佳共掺杂浓度为1 mol%，LiNbO3:0.01Pr3+、0.01Gd3+的ML增强强度是LiNbO3:0.01Pr3+的177%左右。通过热释光曲线探索了 Gd3+ 共掺杂剂对陷阱能级的影响。机械发光强度的增强被认为归因于由共掺杂 Gd3+ 离子引起的受调节的陷阱数量。