Strong Self‐Trapped Exciton Emissions in Two‐Dimensional Na‐In Halide Perovskites Triggered by Antimony Doping

Soft lattice and strong exciton–phonon coupling have been demonstrated in layered double perovskites (LDPs) recently; therefore, LDPs represents a promising class of compounds as excellent self‐trapped exciton (STE) emitters for applications in solid‐state lighting. However, few LDPs with outstandin...

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Bibliographic Details
Published in:Angewandte Chemie 2021-03, Vol.133 (14), p.7665-7670
Main Authors: Zhang, Yu, Liu, Xingyi, Sun, Huaiyang, Zhang, Jinxia, Gao, Xiaowen, Yang, Chuang, Li, Qi, Jiang, Hong, Wang, Juan, Xu, Dongsheng
Format: Article
Language:English
Subjects:
Ambient temperature
Antimony
Bilayers
Broadband
Chemistry
Doping
Emissions
Emitters
excited state
Excitons
Monolayers
Optoelectronics
perovskite phases
Perovskites
Phenethylamine
Photoluminescence
Photons
Quantum efficiency
self-trapped excitons
solid-state lighting
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Summary:Soft lattice and strong exciton–phonon coupling have been demonstrated in layered double perovskites (LDPs) recently; therefore, LDPs represents a promising class of compounds as excellent self‐trapped exciton (STE) emitters for applications in solid‐state lighting. However, few LDPs with outstanding STE emissions have been discovered, and their optoelectronic properties are still unclear. Based on the three‐dimensional (3D) Cs2NaInCl6, we synthesized two 2D derivatives (PEA)4NaInCl8:Sb (PEA=phenethylamine) and (PEA)2CsNaInCl7:Sb with monolayer and bilayer inorganic sheets by a combination of dimensional reduction and Sb‐doping. Bright broadband emissions were obtained for the first time under ambient temperature and pressure, with photoluminescence quantum efficiency (PLQE) of 48.7 % (monolayer) and 29.3 % (bilayer), superior to current known LDPs. Spectroscopic characterizations and first‐principles calculations of excited state indicate the broadband emissions originate from STEs trapped at the introduced [SbCl6]3− octahedron. Two layered double perovskites of (PEA)4NaInCl8 and (PEA)2CsNaInCl7, with the highest efficiency under ambient temperature and pressure, were successfully prepared. This study clearly presents the origin of self‐trapped exciton emission and provides a feasible strategy to explore new layered perovskite emitters.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.202015873