Results
Title

Revealing the Mechanism of Pressure‐Induced Emission in Layered Silver‐Bismuth Double Perovskites.

Authors

Zhang, Long; Li, Shuoxue; Sun, Huaiyang; Jiang, Qiwen; Wang, Yue; Fang, Yuanyuan; Shi, Ying; Duan, Defang; Wang, Kai; Jiang, Hong; Sui, Laizhi; Wu, Guorong; Yuan, Kaijun; Zou, Bo

Abstract

Pressure‐induced emission (PIE) associated with self‐trapping excitons (STEs) in low‐dimensional halide perovskites has attracted great attention for better materials‐by‐design. Here, using 2D layered double perovskite (C6H5CH2CH2NH3 )4AgBiBr8 as a model system, we advance a fundamental physicochemical mechanism of the PIE from the perspective of carrier dynamics and excited‐state behaviors of local lattice distortion. We observed a pressure‐driven STE transformation from dark to bright states, corresponding a strong broadband Stokes‐shifted emission. Further theoretical analysis demonstrated that the suppressed lattice distortion and enhanced electronic dimensionality in the excited‐state play an important role in the formation of stabilized bright STEs, which could manipulate the self‐trapping energy and lattice deformation energy to form an energy barrier between the potential energy curves of ground‐ and excited‐state, and enhance the electron‐hole orbital overlap, respectively.

Subjects

ACTIVATION energy; POTENTIAL energy; EXCITON theory; PEROVSKITE; EXCITED states; BISMUTH; PIES

Publication

Angewandte Chemie, 2023, Vol 135, Issue 14, p1

ISSN

0044-8249

Publication type

Academic Journal

DOI

10.1002/ange.202301573