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Enhancing broadband emission in indirect bandgap lead halide perovskites by hydrostatic pressure

ORAL

Abstract

Although broadband emission caused by self-trapped excitons (STE) has been widely studied in direct bandgap perovskites, few attention has been paid to indirect bandgap perovskites. Here we report that indirect bandgap all-inorganic perovskite exhibits typical STE induced broadband emission. We use diamond anvil cell to study the response of optical properties of 2D perovskite microplates to hydrostatic pressure. The broadband emission intensity increases significantly with increasing pressure, and the peak position is largely blue-shifted by 650 meV. The mechanism of these phenomena is discussed using experimental methods and theoretical calculations. This work shows a potential method to control and utilize indirect bandgap perovskites materials in optoelectronic devices. <div id="gtx-trans" style="position: absolute; left: 169px; top: 60.04px;"> <div class="gtx-trans-icon"> </div> </div>

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Presenters

  • Shenyu Dai

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

Authors

  • Shenyu Dai

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

  • Zhaojun Qin

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

  • Viktor G. Hadjiev

    Texas Center for Superconductivity, University of Houston

  • Chong Wang

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

  • Zhiming M. Wang

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

  • Guoying Feng

    College of Electronics & Information Engineering, Sichuan University

  • Jiming Bao

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