The optical properties of Cs4PbBr6-CsPbBr3 perovskite composites

Zhixing Gan, Fei Zheng, Wenxin Mao, Chunhua Zhou, Weijian Chen, Udo Bach, Patrick Tapping, Tak W. Kee, Jeffrey A. Davis, Baohua Jia, Xiaoming Wen

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18 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)14676-14683
Number of pages8
JournalNanoscale
Volume11
Issue number31
DOIs
Publication statusPublished - 21 Aug 2019

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