Pressure-induced emission of cesium lead halide perovskite nanocrystals

Zhiwei Ma, Zhun Liu, Siyu Lu, Lingrui Wang, Xiaolei Feng, Dongwen Yang, Kai Wang, Guanjun Xiao (), Lijun Zhang (), Simon A. T. Redfern and Bo Zou ()
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Zhiwei Ma: Jilin University
Zhun Liu: Jilin University
Siyu Lu: Zhengzhou University
Lingrui Wang: Jilin University
Xiaolei Feng: University of Cambridge
Dongwen Yang: Jilin University
Kai Wang: Jilin University
Guanjun Xiao: Jilin University
Lijun Zhang: Jilin University
Simon A. T. Redfern: University of Cambridge
Bo Zou: Jilin University

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Metal halide perovskites (MHPs) are of great interest for optoelectronics because of their high quantum efficiency in solar cells and light-emitting devices. However, exploring an effective strategy to further improve their optical activities remains a considerable challenge. Here, we report that nanocrystals (NCs) of the initially nonfluorescent zero-dimensional (0D) cesium lead halide perovskite Cs4PbBr6 exhibit a distinct emission under a high pressure of 3.01 GPa. Subsequently, the emission intensity of Cs4PbBr6 NCs experiences a significant increase upon further compression. Joint experimental and theoretical analyses indicate that such pressure-induced emission (PIE) may be ascribed to the enhanced optical activity and the increased binding energy of self-trapped excitons upon compression. This phenomenon is a result of the large distortion of [PbBr6]4− octahedral motifs resulting from a structural phase transition. Our findings demonstrate that high pressure can be a robust tool to boost the photoluminescence efficiency and provide insights into the relationship between the structure and optical properties of 0D MHPs under extreme conditions.

Date: 2018
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DOI: 10.1038/s41467-018-06840-8

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