Pressure‐Engineered Photoluminescence Tuning in Zero‐Dimensional Lead Bromide Trimer Clusters

Zero‐dimensional (0D) hybrid metal halides are promising light emitters. However, it is still challenging to accurately design their structures with targeted photoluminescence properties. Herein, high pressure is used to change the self‐trapped exciton (STE) emission of 0D (bmpy)9[ZnBr4]2[Pb3Br11] (...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2021-02, Vol.60 (5), p.2583-2587
Main Authors: Li, Qian, Chen, Zhongwei, Li, Mingze, Xu, Bin, Han, Jiang, Luo, Zhishan, Tan, Li, Xia, Zhiguo, Quan, Zewei
Format: Article
Language:English
Subjects:
Broadband
Compression
Contraction
Distortion
Emission analysis
Emitters
Excitons
Halides
High pressure
Light emission
Luminescence
Metal halides
Optical properties
Photoluminescence
Photons
self-trapped exciton emission
trimer cluster
Trimers
Tuning
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Summary:Zero‐dimensional (0D) hybrid metal halides are promising light emitters. However, it is still challenging to accurately design their structures with targeted photoluminescence properties. Herein, high pressure is used to change the self‐trapped exciton (STE) emission of 0D (bmpy)9[ZnBr4]2[Pb3Br11] (bmpy: 1‐butyl‐1‐methylpyrrolidinium). Under initial compression, the simultaneous contraction and distortion of photoactive [Pb3Br11]5− vary the equilibrium of STE emissions between different excited states, tuning the emission color from yellow green to cyan. Notably, sufficient structural distortion under continuous compression leads to the formation of more and deeper STE states, exhibiting an unprecedented broadband white‐light emission. This study reveals the structure‐dependent optical properties of 0D hybrid metal halides, providing novel insights into the mechanism of STE emission. The self‐trapped exciton emission of zero‐dimensional metal halide, (bmpy)9[ZnBr4]2[Pb3Br11] (bmpy: 1‐butyl‐1‐methylpyrrolidinium), is delicately varied via a high pressure technique. Through the pressure‐induced structural distortion, a clear change of emission color, intense white‐light emission and the corresponding variation in structure–property relationships are achieved.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202009237