Abstract In this work, intense blue up-conversion (UC) luminescence in LaNbO4: Tm3+/Yb3+/Nd3+ phosphors were obtained under the excitation of 808 nm. The laser-induced thermal effect and the role of Nd3+ in this type of phosphors were discussed. Compared with Tm3+ singly doped and Tm3+/Yb3+ doubly doped samples, thousands-fold and 30-fold overall enhancement in the blue emission intensity of Tm3+ in Tm3+/Yb3+/Nd3+ triply doped LaNbO4 were achieved with the help of Nd3+ sensitizing and the energy transfer bridging Yb3+ ion. The luminescence-enhancement effect exhibited a strong dependence on Nd3+ doping concentration, and the optimal concentration of Nd3+ was found to be 1.0 mol%. Once the doping concentration of Nd3+ exceeded this value, concentration dependent luminescence quenching occurred. Moreover, the laser-induced thermal effect on Tm3+-doped samples was investigated by using Er3+-doped sample as the thermal probe. It was found that the elevation of sample temperature induced by laser irradiation depended on both the doping concentrations of Nd3+ and the excitation power density of 808 nm laser.

中文翻译：

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808 nm 激发下激光诱导热效应和 Nd3+ 在 Tm3+/Yb3+/Nd3+ 三重掺杂 LaNbO4 上转换荧光粉中的作用

摘要 在这项工作中，在 808 nm 激发下获得了 LaNbO4: Tm3+/Yb3+/Nd3+ 荧光粉中强烈的蓝色上转换 (UC) 发光。讨论了激光诱导的热效应和 Nd3+ 在此类荧光粉中的作用。与 Tm3+ 单掺杂和 Tm3+/Yb3+ 双掺杂样品相比，在 Nd3+ 敏化和能量转移的帮助下，Tm3+/Yb3+/Nd3+ 三重掺杂的 LaNbO4 中 Tm3+ 的蓝色发射强度总体增强了数千倍和 30 倍桥接 Yb3+ 离子。发光增强效应对Nd3+掺杂浓度有很强的依赖性，发现Nd3+的最佳浓度为1.0 mol%。一旦 Nd3+ 的掺杂浓度超过该值，就会发生浓度依赖性发光猝灭。而且，通过使用 Er3+ 掺杂样品作为热探针研究了激光对 Tm3+ 掺杂样品的热效应。发现激光照射引起的样品温度升高取决于Nd3+的掺杂浓度和808 nm激光的激发功率密度。