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Updated: Sep 24, 2025

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
Facile anion-exchange reaction in mixed-cation lead bromide perovskite nanocrystals
Ambra Pisanu1, Paolo Quadrelli1, Lorenzo Malavasi1
1Department of Chemistry, INSTM Viale Taramelli 16 27100 Pavia Italy lorenzo.malavasi@unipv.it.
Abstract:
The present paper reports a facile and fast anion exchange reaction approach for perovskite nanocrystals (NCs). The reaction has been applied to a mixed-cation sample, namely FA0.8Cs0.2PbBr3, and just employs lead halide precursors to achieve a significant shift in the nanocrystals emission. Within 30 minutes reaction time and a molar ratio between the NCs and the halide precursors of 1 : 1, it was possible to cover more than 120 nm in the visible region. The exchanged NCs maintain their cubic-shaped morphology and narrow emission peak width for the whole compositional range explored. The present approach also allows a reduction in solvent use since it does not require any halide precursor synthesis nor complex post-synthesis treatments.
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