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Research Article

Unveiling non-radiative center control in CsPbBr3 nanocrystals: A comprehensive comparative analysis of hot injection and ligand-assisted reprecipitation approaches

Daocheng Hong1( ), Yuchen Zhang3, Shuhan Pan3, Hanyu Liu2, Wei Mao3, Wanli Zhang4, Yuhui Ye4, Zhihong Wei2, Xuxing Lu5, Xiaoyong Wang4, Zhenda Lu3, Yuxi Tian2
Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China
Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
College of Engineering and Applied Sciences, Nanjing University, Nanjing 210023, China
National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
School of Electronic, Electrical Engineering and Physics, Fujian University of Technology, Fuzhou 350118, China
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Graphical Abstract

This paper demonstrated that different synthetic strategies can generate different surface quenchers which can significantly affect the photo-induced blinking behaviors of CsPbBr3 nanocrystals, opening up new possibilities for controlling defect engineering in such materials.

Abstract

Metal–halide perovskite nanocrystals (NCs) have gained significant attention in the field of optoelectronic and photonic devices due to their promising applications. Despite their exceptional optical properties, the impact of different synthetic strategies on the fundamental nature of NCs, such as nonradiative recombination centers, remains poorly understood. In this study, we investigated the photophysical properties of CsPbBr3 NCs synthesized using two distinct methods, hot injection and ligand-assisted reprecipitation, at the individual particle level. We observed different blinking behaviors under specific photoexcitation power densities and proposed, through intensity–lifetime analysis and Monte–Carlo simulations, that these different synthetic strategies can fabricate NCs with similar crystal structures but distinct surface quenchers with varying energy levels, which significantly affected the photo-induced blinking-down and blinking-up behaviors in individual NCs. Our findings indicate a practical and feasible approach for controlling defect engineering in perovskite NCs, with significant implications for their use in optoelectronic and other technological applications.

Keywords

metal–halide perovskite nanocrystalsphotophysical propertiesnonradiative recombination centershot injection methodligand-assisted reprecipitation

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Nano Research
Volume 17 Issue 5,
May 2024
Pages 4525-4534
DOI: 10.1007/s12274-023-6326-2
Cite this article:
Hong D, Zhang Y, Pan S, et al. Unveiling non-radiative center control in CsPbBr3 nanocrystals: A comprehensive comparative analysis of hot injection and ligand-assisted reprecipitation approaches. Nano Research, 2024, 17(5): 4525-4534. https://doi.org/10.1007/s12274-023-6326-2
Topics:
NanocrystalsPhotoluminescence spectroscopySemiconductor quantum dots

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Received: 31 August 2023
Revised: 29 October 2023
Accepted: 08 November 2023
Published: 07 December 2023
© Tsinghua University Press 2023
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