Journal
NATURE COMMUNICATIONS
Volume 9, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-06840-8
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Funding
- National Key R&D Program of China [2018YFA0305900]
- National Science Foundation of China [21725304, 11774125, 21673100, 91227202, 11774120, 61722403, 11674121]
- Chang Jiang Scholars Program of China [T2016051]
- Changbai Mountain Scholars Program [2013007]
- National Defense Science and Technology Key Laboratory Fund [6142A0306010917]
- Scientific Research Planning Project of the Education Department of Jilin Province [JJKH20180118KJ]
- NERC [NE/P019714/1]
- China Scholarship Council
- National Key Research and Development Program of China [2016YFB0201204]
- Chinese Academy of Science [KJCX2-SW-N20, KJCX2-SW-N03]
- Program for JLU Science and Technology Innovative Research Team
- NERC [NE/P019714/1] Funding Source: UKRI
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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 (OD) 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 OD MHPs under extreme conditions.
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