Circularly polarized luminescence (CPL) materials are highly attractive for next-generation photonic and information technologies, yet achieving both a large luminescence dissymmetry factor (glum) and near-unity photoluminescence quantum yield (PLQY) remains challenging in lead-free chiral metal halides. Here, we report a pair of zero-dimensional chiral indium-based chloride enantiomers, (R/S-AQ)2In1-xSbxCl7 (AQ = 3-aminoquinuclidine), enabled by Sb3+-doping. A dense interfacial N-H···Cl hydrogen-bond network strengthens organic-inorganic coupling and is likely to facilitate chiral transfer, while Sb3+ incorporation activates highly efficient broadband self-trapped exciton emission. As a result, the enantiomers exhibit near-unity PLQY (up to 99.32%) together with mirror-image CPL signals with |glum| ≈ 2.0 × 10-2. A CP-LED based on a commercial 280 nm UV chip shows stable device emission under electrical driving while retaining circular polarization. Our work demonstrates an effective strategy for co-optimizing efficiency and polarization in chiral metal halides toward practical CPL devices.
Xu et al. (Thu,) studied this question.