Pressure-induced emission of cesium lead halide perovskite nanocrystals.
Springer Science and Business Media LLC
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Ma, Z., Liu, Z., Lu, S., Wang, L., Feng, X., Yang, D., Wang, K., et al. (2018). Pressure-induced emission of cesium lead halide perovskite nanocrystals.. Nat Commun, 9 (1), 4506. https://doi.org/10.1038/s41467-018-06840-8
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.
Natural Environment Research Council (NE/P012167/1)
Natural Environment Research Council (NE/P019714/1)
External DOI: https://doi.org/10.1038/s41467-018-06840-8
This record's URL: https://www.repository.cam.ac.uk/handle/1810/286575
Attribution 4.0 International
Licence URL: https://creativecommons.org/licenses/by/4.0/