Synthesis of five-layered chiral perovskite nanowires and enacting chiroptical activity regulation

Chiral perovskites have drawn much attention due to their abundant applications in electronic, magnetic, and spintronic technologies. Herein, we report fabrication of a five-layer chiral perovskite nano -wire (n = 5) and its polarity preference regulation using chiral phen-ylethylamine or 2-butylamine as chiral ligands. We verify that the chiroptical response of the five-layer nanowire is governed by the localized surface chiral potential related to the ligand-induced helical distortion of [PbX6]4- octahedra on the top and bottom layers. Accordingly, an optical enantiomeric pair is created by vary-ing the ligand's type or concentration rather than inversion of the ligand's absolute configuration. This phenomenon cannot be achieved in perovskite nanoplates. Circularly polarized lumines-cence ranges from 450 nm to 580 nm, and a highest luminescence dissymmetry factor of (2.67 G 0.5) 3 10-2 is achieved. This approach unlocks high-n chiral perovskite nanostructures and provides an additional degree of freedom beyond configurational chirality in regulating polarity.