Publication date: 15th May 2026
Chiral metal halide perovskite nanocrystals (NCs) are becoming prominent as promising materials for chiroptical applications, yet the relationship between chiral ligands surface modification and optical properties remains poorly understood in scalable solution-processed systems. In this work we report the synthesis of chiral formamidinium lead bromide (FAPbBr3) NCs via ligand-assisted reprecipitation (LARP). For that we have introduced enantiopure (R)- or (S)-2-Octylamine in a symmetric series of dilution at 20, 40, and 60 mol % and compared with non-Chiral n-Octylamine. X-ray diffraction confirms that the pure cubic structure is retained in all samples, demonstrating that chirality does not induce bulk lattice distortion. UV-Vis absorption shows an enhanced excitonic confinement in chiral NC samples relative to the non-chiral control, while time-resolved photoluminescence shows a systematically longer exciton lifetimes after the incorporation of the chiral ligands. Circular dichroism (CD) spectroscopy confirms that the maximum in the CD spectra correlating precisely with the NC excitonic absorption between ~ 430-450 nm. The enantiomers yield mirror-image CD spectra, while a racemic (R+S) mixture produces a flat baseline, confirming the molecular origin of the chiroptical response. It is noteworthy that the intensity of the CD signal increases inversely with the concentration of the chiral ligand, with the addition of 20 mol % producing the strongest response. This work demonstrates the LARP method as a scalable and accessible technique to synthesize chiral perovskite NC emitters and provides quantitative design guidelines for optimising chirality through surface ligand engineering.
This work is partially funded by the Ministerio de Ciencia e Innovación of the Spanish
government by the Severo Ochoa Grant MCIU/AEI/10.13039/501100011033 (CEX2024-
001469-S) and ElectroVolt PID2022-139866NB-I00. Financial support from the
European Union through the ERC Advanced grant ERC 101097684- Excited is appreciated.
The authors also acknowledge ICIQ, CERCA, and ICREA for financial support
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