Designing efficient ligand exchange strategies for the synthesis of stable perovskite nanocrystals

Xuanyu Zhang; Zhiwei Yao; Ming Deng; Ruifa Wu; Jing Wang; Yong Ren; Chengbo Wang; Guohua Jia; Lei Qian; Chaoyu Xiang

doi:10.1039/D4TC03575E

Designing efficient ligand exchange strategies for the synthesis of stable perovskite nanocrystals†‡

Xuanyu Zhang,§^abcd Zhiwei Yao,§^acd Ming Deng,^acd Ruifa Wu,^acd Jing Wang,^fg Yong Ren,

^bf Chengbo Wang,^g Guohua Jia,

^h Lei Qian^acde and Chaoyu Xiang

*^acde

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* Corresponding authors

^a Laboratory of Advanced Nano-Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Science, Ningbo, Zhejiang, China
E-mail: xiangchaoyu@nimte.ac.cn

^b Key Laboratory of Carbonaceous Wastes Processing and Process Intensification Research of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, China

^c Division of Functional Materials and Nanodevices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

^d Laboratory of Advanced Nano-Optoelectronic Materials and Devices, Qianwan Institute of CNITECH, Ningbo, P. R. China, Ningbo 315300, China

^e Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, China

^f Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute, Ningbo 315040, China

^g Department of Electrical and Electronic Engineering, University of Nottingham Ningbo China, Ningbo 315100, China

^h School of Molecular and Life Sciences, Curtin University, Bentley, Australia

Abstract

Perovskite nanocrystals are promising candidates for light-emitting diodes due to their excellent photoelectronic properties. However, the stability of perovskite nanocrystal thin films against oxygen, water, UV light, and heat is inadequate when synthesized using traditional hot injection methods, limiting their practical applications in devices such as light-emitting diodes. In this study, we synthesized perovskite nanocrystals with enhanced stability and charge transport properties through in situ ligand exchange using zwitterionic ligands. The perovskite thin film retained 90% of its initial PLQY at 353 K and in ambient conditions (relative humidity 80%). Additionally, after 16 hours of UV 254 irradiation, the perovskite film maintained 80% of its initial PLQY. Highly efficient perovskite QLEDs based on these stable perovskite nanocrystals were also fabricated, achieving a sub-bandgap turn-on voltage and an external quantum efficiency of 23.36%, with an operational lifetime T₅₀ of 1.6 hours at 5000 cd m⁻².

Journal of Materials Chemistry C

Designing efficient ligand exchange strategies for the synthesis of stable perovskite nanocrystals†‡

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Designing efficient ligand exchange strategies for the synthesis of stable perovskite nanocrystals

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