One-step conversion of CsPbBr3 into Cs4PbBr6/CsPbBr3@Ta2O5 core–shell microcrystals with enhanced stability and photoluminescence

Manli Zhang; Yao Li; Kaimin Du; Xuan Gao; Yu Lu; Ding Wen; Shuang Yao; Jing Feng; Hongjie Zhang

doi:10.1039/D0TC05039C

One-step conversion of CsPbBr₃ into Cs₄PbBr₆/CsPbBr₃@Ta₂O₅ core–shell microcrystals with enhanced stability and photoluminescence†

Manli Zhang,^ab Yao Li,^ab Kaimin Du,^ab Xuan Gao,^ab Yu Lu,^a Ding Wen,^ab Shuang Yao,^a Jing Feng

*^ab and Hongjie Zhang

*^ac

Author affiliations

* Corresponding authors

^a State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China
E-mail: fengj@ciac.ac.cn, hongjie@ciac.ac.cn
Fax: +86 431 85698041
Tel: +86 431 85262127

^b University of Science and Technology of China, Hefei 230026, China

^c Department of Chemistry, Tsinghua University, Beijing 100084, China

Abstract

It is well known that surface passivation and modification are efficient approaches to improve the photoluminescence and stability of perovskites. Although CsPbBr₃ nanocrystals (NCs) could be embedded into a Cs₄PbBr₆ matrix to enhance the photoluminescence property, the limited stability will hinder their applications. It still remains a challenge to convert CsPbBr₃ to Cs₄PbBr₆ in one step with surface modification by using oxide on a single-particle level. Herein, the process of conversion from CsPbBr₃ to Cs₄PbBr₆/CsPbBr₃ microcrystals (MCs) by a ligand-assisted supersaturated recrystallization (LASR) method has been studied. To improve its stability, CsPbBr₃ has been successfully converted into monodisperse Cs₄PbBr₆/CsPbBr₃@Ta₂O₅ core–shell MCs through a facile one-step sol–gel method at room temperature. Compared with Cs₄PbBr₆/CsPbBr₃, Cs₄PbBr₆/CsPbBr₃@Ta₂O₅ has better light stability and thermal stability. Cs₄PbBr₆/CsPbBr₃@Ta₂O₅ MCs display great enhancement in photoluminescence quantum yield (PLQY) (up to 94.7%) and photoluminescence lifetime (up to 67.8 ns). Furthermore, the luminous efficiency of the WLED device based on Cs₄PbBr₆/CsPbBr₃@Ta₂O₅ (31.9 lm W⁻¹) is twice that of the WLED device fabricated by Cs₄PbBr₆/CsPbBr₃ (15.2 lm W⁻¹).

This article is part of the themed collection: Journal of Materials Chemistry C HOT Papers

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Article information

DOI: https://doi.org/10.1039/D0TC05039C
Article type: Paper
Submitted: 25 Oct 2020
Accepted: 25 Nov 2020
First published: 07 Dec 2020

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J. Mater. Chem. C, 2021,9, 1228-1234

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One-step conversion of CsPbBr₃ into Cs₄PbBr₆/CsPbBr₃@Ta₂O₅ core–shell microcrystals with enhanced stability and photoluminescence

M. Zhang, Y. Li, K. Du, X. Gao, Y. Lu, D. Wen, S. Yao, J. Feng and H. Zhang, J. Mater. Chem. C, 2021, 9, 1228 DOI: 10.1039/D0TC05039C

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Journal of Materials Chemistry C