The past few years have witnessed extensive attention to the size-dependent up-conversion luminescence thermal enhancement of Ln doped nanoparticles, where the involvement of Yb ions seem to be essential. In this work, a size-dependent down-shifting luminescence thermal enhancement behavior of NaGdF:Ce/Tb has been reported. Specifically, it is the first time to realize the size-dependent luminescence thermal enhancement with a non-Yb-involved luminescence process. We demonstrate that the size-dependent luminescence behavior is ascribed to the establishment of energy migration channels via Gd sublattice. These findings offer a feasible way to design the luminescence thermal behavior of nanophosphors with a broader range in terms of both chemical composition and luminescence mechanism.

中文翻译：

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基于非 Yb3+ 介导的能量迁移的尺寸依赖性下移发光热增强

在过去的几年里，Ln 掺杂纳米粒子的尺寸依赖性上转换发光热增强引起了广泛的关注，其中 Yb 离子的参与似乎至关重要。在这项工作中，报道了 NaGdF:Ce/Tb 的尺寸依赖性下移发光热增强行为。具体来说，这是首次通过非Yb涉及的发光过程实现尺寸依赖的发光热增强。我们证明尺寸依赖性发光行为归因于通过 Gd 亚晶格建立能量迁移通道。这些发现为设计化学成分和发光机制方面具有更广泛范围的纳米磷光体的发光热行为提供了可行的方法。