Pressure‐Induced Unusual Transition of Luminescence Mechanics from Self‐Trapped Exciton to Free Exciton Emission in Lead Bromide Perovskitoids

Yan Rong; Lingrui Wang; Yongheng Wang; Wenxin Wang; Jiaxiang Wang; Yifang Yuan; Urooj Shahzadi; Junnian Chen; Lei Zhang; Kai Wang; Haizhong Guo

doi:10.1002/adom.202402086

journal article·2025-01Open access

Pressure‐Induced Unusual Transition of Luminescence Mechanics from Self‐Trapped Exciton to Free Exciton Emission in Lead Bromide Perovskitoids

Yan Rong, Lingrui Wang, Yongheng Wang, Wenxin Wang, Jiaxiang Wang, Yifang Yuan, Urooj Shahzadi, Junnian Chen, Lei Zhang, Kai Wang, Haizhong Guo

Advanced Optical Materials· Volume 13· Issue 3

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Abstract

Abstract Understanding the luminescence mechanics of metal halide perovskites is the key to uncovering the detailed pathways responsible for remarkable photophysical properties and engineering materials with enhanced optoelectronic properties. In this work, high pressure is employed to reveal the self‐trapped exciton (STE) emission features of a 1D lead bromide perovskitoid (HM)Pb₂Br₆. Upon compression, a remarkable 42‐fold enhancement in the intensity compared to the initial emission, along with exciton transfer from STE emission to narrow free exciton emission, is achieved in (HM)Pb₂Br₆. These phenomena are related to the anisotropic compression of (HM)Pb₂Br₆, which results in enhanced structural stiffness and a significant reduction in the distances of Pb─Pb bond lengths between inter‐[Pb₂Br₆]²⁻ chains, as well as Pb─Br bond lengths within the three basic intra‐[Pb₂Br₆]²⁻ octahedra. These results provide essential insights into the intriguing photophysics of STEs and shed new light on the dramatic exciton transfer to control and enhance the optical properties of the metal halide perovskites.

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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Optical properties and cooling technologies in crystalline materials · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Physics and Electronic Engineering Mudanjiang Normal University Mudanjiang 157011 P. R. China

Key Laboratory of Materials Physics Ministry of Education School of Physics Zhengzhou University Zhengzhou 450052 P. R. China

Ministry of Education Key Laboratory of Green Preparation and Application for Functional Materials and School of Materials Science & Engineering Hubei University Wuhan 430062 P. R. China

Shandong Key Laboratory of Optical Communication Science and Technology, School of Physics Science and Information Technology Liaocheng University Liaocheng 252059 P. R. China

Institute of Quantum Materials and Physics Henan Academy of Sciences Zhengzhou 450046 P. R. China

Funding

National Key Research and Development Program of China · Natural Science Foundation of Henan Province · National Natural Science Foundation of China

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