局域结构依赖的稀土上转换发光

稀土掺杂上转换发光纳米材料作为一种新型的荧光材料,因其发光性能优异、化学性质稳定以及自发荧光干扰小等优点受到国内外研究者的广泛关注。如何实现稀土上转换发光性能的可控调节一直是稀土纳米发光材料研究中的一个热点问题。简要总结了近年来关于局域结构依赖的稀土上转换发光性能的研究进展,分别从结构设计和晶体结构调节两个方面展开,主要内容包括核壳结构、复合结构和孔洞结构的设计对稀土上转换发光性能的影响及晶体结构对稀土上转换发光强度和上转换发光红绿比的影响,以期为制备高质量、可定制上转换发光性质的稀土掺杂纳米发光材料提供参考。

Local-Structure-Dependent Upconversion Luminescence in Lanthanide-Doped Nanocrystals

As a new type of fluorescent materials,lanthanide-doped upconversion nanocrystals(UCNCs)have been receiving tremendous interest due to their distinct physicochemical features such as excellent optical performance,high chemical stability and weak autofluorescence interference.Hitherto it has been a research hotspot to realize tunable upconversion luminescence(UCL)in lanthanide-doped UCNCs.This article summarized the recent progress in the local-structure-dependent UCL in lanthanide-doped UCNCs,which covers two main sections including morphological structure design and crystal structure regulation.In the first section,UCL in lanthanide-doped UCNCs with core-shell,nanocomposite and hollow structures were comprehensively surveyed.In the second section,the crystal structure related UCL intensity and red-to-green ratio and their underlying mechanisms were elaborately discussed.This review aims at providing a guidance for constructing high-quality UCNCs with tailored UCL profile for diverse applications.