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; Bo Zou

doi:10.1038/s41467-018-06840-8

Pressure-induced emission of cesium lead halide perovskite nanocrystals

Nat Commun. 2018 Oct 29;9(1):4506. doi: 10.1038/s41467-018-06840-8.

Authors

Zhiwei Ma¹, Zhun Liu², Siyu Lu³, Lingrui Wang¹, Xiaolei Feng^{4

5}, Dongwen Yang², Kai Wang¹, Guanjun Xiao⁶, Lijun Zhang^{7

8}, Simon A T Redfern^{4

5}, Bo Zou⁹

Affiliations

¹ State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.
² Key Laboratory of Automobile Materials of MOE, and School of Materials Science, Jilin University, Changchun, 130012, China.
³ College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, China.
⁴ Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK.
⁵ Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China.
⁶ State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China. xguanjun@jlu.edu.cn.
⁷ State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China. lijun_zhang@jlu.edu.cn.
⁸ Key Laboratory of Automobile Materials of MOE, and School of Materials Science, Jilin University, Changchun, 130012, China. lijun_zhang@jlu.edu.cn.
⁹ State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China. zoubo@jlu.edu.cn.

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.

Publication types

Research Support, Non-U.S. Gov't