Improved photophysical properties and durability of CsPbBr3 NCs endowed by inorganic oxoacid and bromide ions

Shuhua Chen; Qixuan Zhong; Jun Liu; Wenhao Guan; Pengli Li; Israr Mahmood; Muhan Cao; Qiao Zhang

doi:10.1039/D1NR01198G

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Improved photophysical properties and durability of CsPbBr₃ NCs endowed by inorganic oxoacid and bromide ions†

Shuhua Chen,‡^a Qixuan Zhong,‡^a Jun Liu,^a Wenhao Guan,^a Pengli Li,^a Israr Mahmood,^a Muhan Cao

*^a and Qiao Zhang

Author affiliations

* Corresponding authors

^a Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, People's Republic of China
E-mail: mhcao@suda.edu.cn

Abstract

All-inorganic lead halide perovskite nanocrystals (NCs) have been promising candidates in various optoelectrical fields. It is still challenging to further enhance their optical properties and stability to meet the requirements of practical applications. Herein, we develop a passivation strategy towards CsPbBr₃ NCs by using inorganic phosphate and bromide anions. Phosphate can coordinate with lead ions on CsPbBr₃ NCs as capping ligands; meanwhile, excess bromide can strengthen the repair of surface trapping sites. The treated NCs exhibit near-unity quantum yield and boosted radiative recombination. In addition, obvious enhancement has been realized in their durability against polar solvents. A white light emitting diode (WLED) has been fabricated by employing the passivated NCs as a green light source, which possesses high luminous efficiency and operational stability.

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Article information

DOI: https://doi.org/10.1039/D1NR01198G
Article type: Paper
Submitted: 23 Feb 2021
Accepted: 27 Apr 2021
First published: 27 Apr 2021

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Nanoscale, 2021,13, 9634-9640

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Improved photophysical properties and durability of CsPbBr₃ NCs endowed by inorganic oxoacid and bromide ions

S. Chen, Q. Zhong, J. Liu, W. Guan, P. Li, I. Mahmood, M. Cao and Q. Zhang, Nanoscale, 2021, 13, 9634 DOI: 10.1039/D1NR01198G

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