Pressure-Induced Remarkable Enhancement of Self-Trapped Exciton Emission in One-Dimensional CsCu2I3 with Tetrahedral Unit,Journal of the American Chemical Society

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Pressure-Induced Remarkable Enhancement of Self-Trapped Exciton Emission in One-Dimensional CsCu2I3 with Tetrahedral Unit
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-01-10 , DOI: 10.1021/jacs.9b13419
Qian Li ₁ , Zhongwei Chen ₁ , Bo Yang ₂ , Li Tan ₁ , Bin Xu ₁ , Jiang Han ₁ , Yusheng Zhao ₁ , Jiang Tang ₂ , Zewei Quan ₁

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Self-trapped exciton (STE) emissions derived from inorganic octahedral units make metal halide perovskites promising photoluminescence materials for light-emitting applications. However, there is still little understanding of the intrinsic STE emissions in metal halide perovskites or derivatives with nonoctahedral units. In this work, via high pressure compression, remarkable STE emission enhancement is, for the first time, realized in one-dimensional CsCu2I3 crystal with {CuCl4} tetrahedral units. The inter-tetrahedral distortion with decreased Bohr radius of excitons leads to the slight emission enhancement of ambient phase below 0.7 GPa. Notably, the obvious structural distortions of both inter- and intra-tetrahedra contribute to the varied trapping/detrapping processes of excitons, which are responsible for the significant emission enhancement of high pressure phase. This work not only sheds light on the structure-optical property relationships of tetrahedron-based halide complexes, but also may provide guidance for the design and fabrication of highly luminescent metal halides.

中文翻译：

具有四面体单元的一维 CsCu2I3 中自陷激子发射的压力诱导显着增强

源自无机八面体单元的自陷激子 (STE) 发射使金属卤化物钙钛矿成为有希望用于发光应用的光致发光材料。然而，人们对金属卤化物钙钛矿或具有非八面体单元的衍生物的固有 STE 发射知之甚少。在这项工作中，通过高压压缩，首次在具有 {CuCl4} 四面体单元的一维 CsCu2I3 晶体中实现了显着的 STE 发射增强。激子玻尔半径减小的四面体间畸变导致环境相在0.7 GPa以下的轻微发射增强。值得注意的是，四面体间和四面体内的明显结构扭曲有助于激子的不同俘获/去俘获过程，它们是高压相排放显着增强的原因。这项工作不仅揭示了四面体基卤化物配合物的结构-光学性质关系，而且可以为高发光金属卤化物的设计和制造提供指导。

更新日期：2020-01-10

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