Issue 2, 2024

Direct synthesis of CsPbX3 perovskite nanocrystal assemblies

Abstract

Inorganic CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) possess many advantageous optoelectronic properties, making them an attractive candidate for light emitting diodes, lasers, or photodetector applications. Such perovskite NCs can form extended assemblies that further modify their bandgap and emission wavelength. In this article, a facile direct synthesis of CsPbX3 NC assemblies that are 1 μm in size and are composed of 10 nm-sized NC building blocks is reported. The direct synthesis of these assemblies with a conventional hot-injection method of the NCs is achieved through the judicious selection of the solvent, ligands, and reaction stoichiometry. Only under selective reaction conditions where the surface ligand environment is tuned to enhance the hydrophobic interactions between ligand chains of neighbouring NCs is self-assembly achieved. These assemblies possess narrow and red-shifted photoluminescence compared to their isolated NC counterparts, which further expands the colour gamut that can be rendered from inorganic perovskites. This is demonstrated through simple down-converting light emitters.

Graphical abstract: Direct synthesis of CsPbX3 perovskite nanocrystal assemblies

Supplementary files

Article information

Article type
Paper
Submitted
26 avq 2023
Accepted
17 noy 2023
First published
12 dek 2023

Nanoscale, 2024,16, 614-623

Direct synthesis of CsPbX3 perovskite nanocrystal assemblies

C. Wang, S. K. Matta, C. K. Ng, C. Cao, M. Sharma, A. S. R. Chesman, S. P. Russo and J. J. Jasieniak, Nanoscale, 2024, 16, 614 DOI: 10.1039/D3NR04285E

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