Publication date: 17th July 2025
Chiral nanocrystals (NCs) have long been regarded as a promising candidate for spintronics and 3D imaging, due to its remarkable and size-tunable optoelectronic and chiroptical properties. However, efforts to induce chirality into these NCs have consistently faced a trade-off between optical activity and colloidal stability. Conventional post-synthetic surface modifications, namely ligand exchange, often introduce surface defect states and compromises photophysical integrity, thus limiting their practical applications.
Here, we address this challenge by designing a new class of chiral zwitterionic ligands that enable simultaneous stereochemical induction and surface passivation during the direct synthesis of CsPbX3 (X = Cl, Br) NCs. These ligands incorporate rigid stereogenic centers and bidentate chelating groups, providing strong surface coordination without compromising crystal quality. The resulting NCs exhibit robust circular dichroism (CD) signals with size tunability across the whole visible spectrum (i.e. 400nm-700nm). As-synthesized chiral QDs demonstrated anisotropy factors up to gCD = 3×10⁻4, with PLQY up to 80%, yet retaining over 90% of their initial photoluminescence (PL) after 4 months under ambient conditions. Furthermore, these ligands can be tailored to incorporate into CsPbI3 via ligand exchange. Structural engineering of the enantiomeric center and the tail of the ligands allows modulation of chiroptical response. This work introduces a new approach that preserves both the PLQY and gCD of chiral perovskites NCs, paving the way for their applications in solution-processable chiral optoelectronics.
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