Pressure-Driven Abnormal Emission Blue-Shift of Lead-Free Halide Double Perovskite Cs2AgInCl6 Nanocrystals

Ao Chen; Xiaoling Jing; Tianyuan Wang; Tingting Zhao; Yu Zhang; Donglei Zhou; Rui Sun; Xueting Zhang; Ran Liu; Bo Liu; Quanjun Li; Bingbing Liu

doi:10.1021/acs.inorgchem.2c00185

Pressure-Driven Abnormal Emission Blue-Shift of Lead-Free Halide Double Perovskite Cs₂AgInCl₆ Nanocrystals

Inorg Chem. 2022 May 2;61(17):6488-6492. doi: 10.1021/acs.inorgchem.2c00185. Epub 2022 Apr 15.

Authors

Ao Chen^{1

2}, Xiaoling Jing¹, Tianyuan Wang³, Tingting Zhao¹, Yu Zhang¹, Donglei Zhou^{1

3}, Rui Sun³, Xueting Zhang¹, Ran Liu¹, Bo Liu¹, Quanjun Li¹, Bingbing Liu¹

Affiliations

¹ State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P. R. China.
² Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China.
³ State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, P. R. China.

PMID: 35426655
DOI: 10.1021/acs.inorgchem.2c00185

Abstract

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, Cs₂AgInCl₆ 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 Cs₂AgInCl₆ 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 Cs₂AgInCl₆ DP nanocrystals. Our study clarified the basic structural-optical correlation of halide DPs and may promote their application in related fields.