Issue 40, 2020

Broadband emission in all-inorganic metal halide perovskites with intrinsic vacancies

Abstract

Efficient broadband emission related to self-trapped excitons (STEs) in low-dimensional perovskites and double perovskite crystals has attracted great attention due to its potential applications in optoelectronics. However, the formation of STEs in three-dimensional (3D) all-inorganic perovskites (CsPbX3) is difficult. Here, through the doping of ytterbium (Yb3+) or erbium (Er3+) ions into CsPbX3 crystals, we observed broadband luminescence from STEs with a linewidth exceeding 200 nm and a Stokes shift of ∼1 eV. Theoretical concepts and experimental studies demonstrated that Pb2+ in perovskites could be replaced by impure ions. Also, the Pb2+ substitution defects and adjacent halide vacancies introduced defect states lying just below the conduction band minimum of perovskites. Strong electron–phonon coupling between trapped carriers and deformation of the [PbX6] cage reduced the energy gap of perovskites. Our study sheds new light on the permanent defects induced in extrinsic STEs in 3D inorganic perovskites. It also provides a clear microscopic picture of the underlying mechanism of formation of STEs.

Graphical abstract: Broadband emission in all-inorganic metal halide perovskites with intrinsic vacancies

Supplementary files

Article information

Article type
Communication
Submitted
29 Aug. 2020
Accepted
22 Sept. 2020
First published
24 Sept. 2020

J. Mater. Chem. C, 2020,8, 13976-13981

Broadband emission in all-inorganic metal halide perovskites with intrinsic vacancies

F. Jiang, X. Jiang, W. Zheng, Y. Ouyang, Y. Zhang, L. Li, P. Fan, H. Zhao, Y. Li, Y. Jiang, X. Zhu, X. Zhuang, Y. Feng and A. Pan, J. Mater. Chem. C, 2020, 8, 13976 DOI: 10.1039/D0TC04123H

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