Pressure-Driven Abnormal Emission Blue-Shift of Lead-Free Halide Double Perovskite Cs 2 AgInCl 6 Nanocrystals

作者：Ao Chen, Xiaoling Jing, Tianyuan Wang, Tingting Zhao, Yù Zhang, Donglei Zhou, Rui Sun, Xueting Zhang, Ran Liu, Bo Liu, Quanjun Li, Bingbing Liu · 发表于：Inorganic Chemistry · 年份：2022 · DOI：10.1021/acs.inorgchem.2c00185 · 被引用次数：20 · 研究领域：Perovskite Materials and Applications、Solid-state spectroscopy and crystallography、Optical properties and cooling technologies in crystalline materials

Lead-free halide double perovskites (DPs) have been proposed as stable and promising alternatives to lead halide perovskites. Understanding the structural–optical properties of halide DPs is important for their applications. In this study, Cs 2 AgInCl 6 DP nanocrystals, with a direct band gap, were synthesized and studied. Because of a strong electron–phonon coupling leading to exciton self-trapping, a broad emission with a large Stokes shift of Cs 2 AgInCl 6 DP nanocrystals is observed. We observed an abnormal blue-shifted emission accompanied by a red-shifted direct absorption edge because of the reduced electron–phonon coupling under compression in the cubic phase Cs 2 AgInCl 6 DP nanocrystals. Our study clarified the basic structural–optical correlation of halide DPs and may promote their application in related fields.