Pressure-engineered enhanced exciton emission in the two-dimensional perovskite HA2PbBr4

IF 3.1 3区化学 Q3 CHEMISTRY, PHYSICAL

Chemical Physics Letters Pub Date : 2025-09-22 DOI:10.1016/j.cplett.2025.142429

Yongfu Liang , Yuping Yang , Hui Xie , Xuerui Cheng , Xiang Zhu , Chaosheng Yuan , Zhijun Fu , Liying Jiang

引用次数: 0

Abstract

Two-dimensional (2D) perovskites constitute a class of quantum-well materials with exceptional promise for optical and optoelectronic applications. Bromide-based 2D perovskites commonly display pressure-induced broad-band emission stemming from self-trapped excitons (STEs). This study, however, reveals a five-fold enhancement in the PL of HA₂PbBr₄ at 6.7 GPa, which is notably attributed to free excitons (FEs). In situ high-pressure spectroscopy and theory show compression suppresses non-radiative carrier trapping, boosting FE emission. Higher pressure induces switching emission to STE-dominated broadband. Pressure release retains fivefold-enhanced emission versus pristine. This work clarifies emission mechanisms and guides material design.

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压力工程增强二维钙钛矿HA2PbBr4中的激子发射

二维（2D）钙钛矿构成了一类量子阱材料，在光学和光电子应用方面具有特殊的前景。溴基二维钙钛矿通常显示由自捕获激子（STEs）引起的压力诱导宽带发射。然而，这项研究显示，在6.7 GPa时，HA2PbBr4的PL增加了5倍，这主要归因于自由激子（FEs）。现场高压光谱和理论表明，压缩抑制了非辐射载流子捕获，提高了FE发射。较高的压力诱导开关发射到ste主导的宽带。压力释放保持五倍增强排放与原始。这项工作阐明了发射机制并指导了材料设计。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemical Physics Letters 化学-物理：原子、分子和化学物理

CiteScore

5.70

自引率

3.60%

发文量

798

审稿时长

33 days

期刊介绍： Chemical Physics Letters has an open access mirror journal, Chemical Physics Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Chemical Physics Letters publishes brief reports on molecules, interfaces, condensed phases, nanomaterials and nanostructures, polymers, biomolecular systems, and energy conversion and storage. Criteria for publication are quality, urgency and impact. Further, experimental results reported in the journal have direct relevance for theory, and theoretical developments or non-routine computations relate directly to experiment. Manuscripts must satisfy these criteria and should not be minor extensions of previous work.