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The Origin of Photoluminescence Center in 0D Cs<sub>4</sub>PbBr<sub>6</sub> Perovskite

ORAL

Abstract

0D perovskite Cs4PbBr6 has attracted considerable attention recently because of highly efficient green photoluminescence (PL) and highly debated opposing opinions on its photoluminescence origin: embedded CsPbBr3 nanocrystals versus intrinsic Br vacancy states. In this work, we provide sensitive but noninvasive methods to directly demonstrate that CsPbBr3 nanocrystals inclusions in Cs4PbBr6 are the dominant green PL source. We first use correlated Raman-PL method to identify the difference between emissive and non-emissive Cs4PbBr6 crystals and reveal the existence of CsPbBr3 nanocrystals in emissive Cs4PbBr6. We then measure the response of luminescence centers to hydrostatic pressure. The observations of red-shifting, diminishing, and eventual disappearance of both green emission and Raman under pressure exclude Br vacancies as possible luminescent centers. The resolution of this long-lasting controversy paves the way for further device applications of low dimensional perovskites, and our techniques are applied to other emerging materials.

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Presenters

  • Zhaojun Qin

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

Authors

  • Zhaojun Qin

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

  • SHENYU DAI

    College of Electronics & Information Engineering, Sichuan University, Sichuan University

  • Viktor G. Hadjiev

    Texas Center for Superconductivity, University of Houston, University of Houston

  • Chong Wang

    School of Materials Science and Engineering, Yunnan University, School of Materials and Energy, Yunnan University

  • Lixin Xie

    Texas Center for Superconductivity, University of Houston

  • Yizhou Ni

    Texas Center for Superconductivity, University of Houston

  • Chunzheng Wu

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

  • Guang Yang

    Materials Science & Engineering, University of Houston

  • Shuo Chen

    Texas Center for Superconductivity, University of Houston

  • Liangzi Deng

    University of Houston, Texas Center for Superconductivity, University of Houston, Texas Center for Superconductivity & Physics Department at University of Houston, University of Houston, Texas Center for Superconductivity, Texas Center of Superconductivity and Physics Department at the University of Houston, TcSUH and Dept of Physics, University of Houston, Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA, Texas Center for Superconductivity and Department of Physics, University of Houston

  • Qingkai Yu

    Ingram School of Engineering, Texas State University

  • Guoying Feng

    College of Electronics & Information Engineering, Sichuan University, Sichuan University

  • Zhiming M. Wang

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

  • Jiming Bao

    Department of Electrical and Computer Engineering, University of Houston