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  • Title: Enhanced Circularly Polarized Photoluminescence of Chiral Perovskite Films by Surface Passivation with Chiral Amines.
    Author: Tao L, Zhan H, Cheng Y, Qin C, Wang L.
    Journal: J Phys Chem Lett; 2023 Mar 09; 14(9):2317-2322. PubMed ID: 36847471.
    Abstract:
    Hybrid organic-inorganic perovskites have shown promise in circularly polarized light source applications when chirality has been introduced. Circularly polarized photoluminescence (CPL) is a significant tool for investigating the chiroptical properties of perovskites. However, further research is still urgently needed, especially with regard to optimization. Here we demonstrate that chiral ligands can influence the electronic structure of perovskites, increasing the asymmetry and emitting circularly polarized photons in photoluminescence. After the modification of chiral amines, the defects of films are passivated, leading to enhanced radiation recombination for which more circularly polarized photons are emitted. Meanwhile, the modification increases the asymmetry in the electronic structure of perovskites, manifested by an increase in the magnetic dipole moment from 0.166 to 0.257 μB and an enhanced CPL signal. This approach offers the possibility of fabricating and refining circularly polarized light-emitting diodes.
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