The optical properties of Cs₄/PbBr₆-CsPbBr₃ perovskite composites
Date
2019
Authors
Gan, Z.
Zheng, F.
Mao, W.
Zhou, C.
Chen, W.
Bach, U.
Tapping, P.
Kee, T.W.
Davis, J.A.
Jia, B.
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Journal article
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Nanoscale, 2019; 11(31):14676-14683
Statement of Responsibility
Zhixing Gan, Fei Zheng, Wenxin Mao, Chunhua Zhou, Weijian Chen, Udo Bach, Patrick Tapping, Tak W. Kee, Jeffrey A. Davis, Baohua Jia and Xiaoming Wen
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Abstract
Although the optoelectronic applications of metal halide perovskites have been intensively investigated in recent years, the fundamental carrier dynamics of zero-dimensional (0D) Cs₄PbBr₆ perovskites has been relatively underexplored; in particular, the nature of the green fluorescence is highly debated. Nevertheless, the unique photophysical properties are of immense interest for a variety of potential applications. In this work, the green emission of the CsPbBr₃-Cs₄PbBr₆ perovskite composites is studied using temperature dependent photoluminescence (PL). The PL spectra at different temperatures simultaneously contain two sub-peaks (520 nm and 550 nm), which are ascribed to the emissions of the band-edge and the defect trapped exciton of CsPbBr₃. This finding will help to understand the controversial photoluminescence currently observed in different 0D Cs₄PbBr₆ perovskites.
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This journal is © The Royal Society of Chemistry 2019