稀土掺杂无序结构晶体的局域位置对称性与发光调控

Local Site Symmetry and Luminescence Manipulation of Lanthanide Doped Disordered

稀土掺杂的无序结构晶体具有优异的下转移和上转换发光性能,通过对材料的发光调控可使其广泛应用于各种光学和光电子学领域。稀土离子的光学性质与所处的晶体场环境密切相关,因此,使用稀土离子作为灵敏的结构探针,可以确定无序结构发光材料中稀土离子掺杂的局域结构和位置对称性;同时,通过改变稀土离子掺杂的无序结构晶体的局域位置对称性也可以进行一系列发光调控。本文首先介绍了稀土离子掺杂无序结构材料的晶体学格位对称性和光谱学格位对称性;其次,系统总结了通过改变局域结构来调控稀土离子掺杂的下转移/上转换发光的最新成果,包括组分调节和外场调节;最后,深入探讨了稀土掺杂无序结构发光材料面临的挑战和发展前景。

Lanthanide ion(Ln3+)-doped disordered materials exhibit excellent downshifting and upconversion lumi⁃nescent properties,which can be widely used in a variety of optical and optoelectronic fields through luminescence modulation.The optical properties of Ln3+ions are closely related to the local structure of crystal field.Thus,by us⁃ing Ln3+as a sensitive structural probe,the local structure and local site symmetry of Ln3+dopants in luminescent ma⁃terials can be determined.Meanwhile,it is also an effective strategy to optimize the luminescence of Ln3+by modulat⁃ing the local site symmetry of the Ln3+-doped disordered materials.In this review,we first clarify the crystallographic lattice site symmetry and spectroscopic lattice site symmetry of Ln3+-doped disordered crystals.Then,we systemati⁃cally summarize the latest achievements of downshifting/upconversion luminescence manipulation by changing the mi⁃crostructures around Ln3+dopants,including internal composition and external field regulation.Finally,the challeng⁃es and prospects of Ln3+-doped disordered luminescent materials are discussed in detail.