The Photoluminescence Origination of the Cs4PbBr6 Perovskite Crystals

ORAL

Abstract

Due to the unique optical properties and high quantum efficiency, the lead halide perovskites have obtained great attentions in the recent years. Currently, the research focuses not only on their potential applications in solar cell, LED, and laser, but also on several unsolved fundamental issues, such as the origin of the luminescence of Cs4PbBr6. The mechanism of the luminescent Cs4PbBr6 perovskite is still under debate. Some people think that the pure Cs4PbBr6 crystals are non-emissive while the strong green PL (Photoluminescence) originates from the CsPbBr3 nanocrystals encapsulated in the Cs4PbBr6 bulk crystals. The others claim that the strong emissive comes from the structural defects of the Cs4PbBr6 crystals. Despite the various reports to support each opinion, no final conclusion has been made up to now. In this work, we plan to controllably synthesize emissive and non-emissive Cs4PbBr6 crystals as well as CsPbBr3 nanocrystals with a strong photoluminescence. By combining various techniques, such as Raman, XRD, (HR)TEM, PL, etc., we attempt to confirm the contribution of CsPbBr3 dopants to the the photoluminescent Cs4PbBr6 crystals.

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Presenters

  • Zhaojun Qin

    University of Electronic Science and Technology of China

Authors

  • Zhaojun Qin

    University of Electronic Science and Technology of China

  • Chong Wang

    Yunnan University

  • Chunzheng Wu

    University of Electronic Science and Technology of China

  • Feng Lin

    Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China,China, University of Electronic Science and Technology of China

  • Shuai Yue

    Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China,China, University of Electronic Science and Technology of China

  • Zhiming Wang

    Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China,China, University of Electronic Science and Technology of China

  • Jiming Bao

    Department of Electrical and Computer Engineering, University of Houston,USA, Department of Electrical and Computer Engineering, University of Houston,US, University of Houston