Issue 23, 2022

Ligand-modified synthesis of shape-controllable and highly luminescent CsPbBr3 perovskite nanocrystals under ambient conditions

Abstract

All-inorganic CsPbBr3 perovskite nanocrystals with well-defined morphology have attracted considerable attention due to their unique size/shape-dependent optical properties. However, the formation mechanism of CsPbBr3 nanocubes (NCs) and nanorods (NRs) remains unknown. Herein, we report a simple room-temperature ligand-mediated synthesis of high-quality CsPbBr3 NCs and NRs by exploiting the synergistic effect of oleic acid (OA), 1-octanethiol (OT) and n-octylamine (OTAm) ligands. High-resolution transmission electron microscopy (HRTEM) images and density-functional theory (DFT) calculations reveal the shape transformation mechanism between CsPbBr3 NCs and NRs with the variation of an OTAm/OT mole ratio. The obtained CsPbBr3 NRs exhibit tunable aspect ratios of 1.6–7.5, and the optimal photoluminescence quantum yield (PLQY) can reach up to 91.2%. Most importantly, the universality of alkyl amine ligands for modifying the shape and optical properties of CsPbBr3 nanocrystals was also demonstrated. A white light emitting diode (WLED) is fabricated by combining the green-emitting CsPbBr3 NRs and commercial red phosphors with a blue chip, which shows a bright white light and wide colour range (121.2% of National Television System Committee (NTSC) standard). This work offers a reliable reference for precisely modifying the morphology of thCsPbBr3 nanocrystals, which will accelerate their commercial application process in the optoelectronic field.

Graphical abstract: Ligand-modified synthesis of shape-controllable and highly luminescent CsPbBr3 perovskite nanocrystals under ambient conditions

Supplementary files

Article information

Article type
Research Article
Submitted
29 Jul 2022
Accepted
05 Oct 2022
First published
17 Oct 2022

Inorg. Chem. Front., 2022,9, 6080-6090

Ligand-modified synthesis of shape-controllable and highly luminescent CsPbBr3 perovskite nanocrystals under ambient conditions

X. Hu, Y. Xu, J. Wang, J. Ma, L. Wang and W. Jiang, Inorg. Chem. Front., 2022, 9, 6080 DOI: 10.1039/D2QI01640K

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