期刊
CHEMICAL SCIENCE
卷 12, 期 44, 页码 14711-14717出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1sc04987a
关键词
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资金
- National Key R&D Program of China [2019YFE0120300]
- National Science Foundation of China [21725304, 22131006, 12174144, 11774125]
- China Postdoctoral Science Foundation [2021M690065]
- Fundamental Research Funds for the Central Universities
This study achieved white light emission related to STE in three-dimensional perovskites through pressure processing, as well as realized pressure-induced chromism, providing a promising strategy for high-quality, stable white-light emission.
Developing single-component materials with bright-white emission is required for energy-saving applications. Self-trapped exciton (STE) emission is regarded as a robust way to generate intrinsic white light in halide perovskites. However, STE emission usually occurs in low-dimensional perovskites whereby a lower level of structural connectivity reduces the conductivity. Enabling conventional three-dimensional (3D) perovskites to produce STEs to elicit competitive white emission is challenging. Here, we first achieved STEs-related emission of white light with outstanding chromaticity coordinates of (0.330, 0.325) in typical 3D perovskites, Mn-doped CsPbBr3 nanocrystals (NCs), through pressure processing. Remarkable piezochromism from red to blue was also realized in compressed Mn-doped CsPbBr3 NCs. Doping engineering by size-mismatched Mn dopants could give rise to the formation of localized carriers. Hence, high pressure could further induce octahedra distortion to accommodate the STEs, which has never occurred in pure 3D perovskites. Our study not only offers deep insights into the photophysical nature of perovskites, it also provides a promising strategy towards high-quality, stable white-light emission.
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