Single particle fluorescence imaging of perovskite nanocrystal crystallization for illustrating coupled nucleation-and-growth

Lige Liu, Dashan Dong, Zhiwei Long, Wanxue Wei, Chang Sun, Wei Liu, Xiaoshuai Huang, Liangyi Chen, Haizheng Zhong () and Kebin Shi ()
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Lige Liu: Peking University
Dashan Dong: Peking University
Zhiwei Long: Beijing Institute of Technology
Wanxue Wei: Peking University
Chang Sun: Peking University
Wei Liu: Peking University
Xiaoshuai Huang: Peking University
Liangyi Chen: Peking University
Haizheng Zhong: Beijing Institute of Technology
Kebin Shi: Peking University

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Because of the lack of spatiotemporal characterization techniques, it has been of great challenge to investigate the crystallization of nanocrystals. With a high-speed structured illumination super-resolution fluorescence microscopy (SIM), we hereby report an in situ fluorescence imaging technique to monitor the crystallization of perovskite nanocrystals at single-particle level. By correlating the fluorescence intensity with particle size, we illustrate the coupled nucleation-and-growth of perovskite nanocrystals in polymer matrix. The temporal fluorescence intensity analysis of individual nanocrystals reveals the diffusion-controlled growth process with a fast growth at the beginning followed by a slow growth. The analysis of ensemble nanocrystals illustrates the evolution of nucleation rate with the change of precursor concentrations. We further analyze the Gibbs free energy fluctuation of couple nucleation-and-growth. The growth free energy dominates in the continuous nucleation of perovskite nanocrystals, which accounts for the narrow size distribution. In comparison with LaMer model, the coupled nucleation-and-growth provides an alternative model to fabricate narrow sized nanocrystals.

Date: 2025
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DOI: 10.1038/s41467-025-60826-x

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