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Intrinsic Self‐Trapped Emission in 0D Lead‐Free (C 4 H 14 N 2 ) 2 In 2 Br 10 Single Crystal
Author(s) -
Zhou Lei,
Liao JinFeng,
Huang ZengGuang,
Wei JunHua,
Wang XuDong,
Chen HongYan,
Kuang DaiBin
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201907503
Subject(s) - photoluminescence , exciton , intersystem crossing , single crystal , excited state , octahedron , perovskite (structure) , chemistry , materials science , atomic physics , crystal structure , crystallography , physics , optoelectronics , condensed matter physics , singlet state
Low‐dimensional lead halide perovskite materials recently have drawn much attention owing to the intriguing broadband emissions; however, the toxicity of lead will hinder their future development. Now, a lead‐free (C 4 H 14 N 2 ) 2 In 2 Br 10 single crystal with a unique zero‐dimensional (0D) structure constituted by [InBr 6 ] 3− octahedral and [InBr 4 ] − tetrahedral units is described. The single crystal exhibits broadband photoluminescence (PL) that spans almost the whole visible spectrum with a lifetime of 3.2 μs. Computational and experimental studies unveil that an excited‐state structural distortion in [InBr 6 ] 3− octahedral units enables the formation of intrinsic self‐trapped excitons (STEs) and thus contributing the broad emission. Furthermore, femtosecond transient absorption (fs‐TA) measurement reveals that the ultrafast STEs formation together with an efficient intersystem crossing has made a significant contribution to the long‐lived and broad STE‐based emission behavior.