Achieving Spectrally Tunable and Strong Circularly Polarized Luminescence in Zero‐Dimensional Hybrid Indium‐Antimony Halides via Dual‐Site‐Doping Strategy

ABSTRACT Chiral zero‐dimensional hybrid metal halides (0D HMHs) are notable in circularly polarized luminescence (CPL)‐active materials for their chiroptical properties, yet efficient and adjustable CPL in chiral 0D HMHs remain rarely reported. This study presents a novel dual‐doping strategy at A and B sites for tunable CPL in chiral 0D HMHs. For indium‐based HMHs using the purely chiral cation S ‐2‐methylpiperazine, B‐site Sb ³⁺ doping yields significant CPL and intense yellow fluorescence, with near‐unity photoluminescence quantum yield (PLQY) and high luminescence dissymmetry factor ( g _lum ) of 6.7 ×1 0 ⁻² . Notably, the introduction of 2,6‐dimethylpiperazine at the A‐site, alongside Sb ³⁺ B‐site doping, enables synergistic emission that spans blue and yellow light, thereby achieving white light emission in chiral 0D HMHs for the first time. This system achieves a PLQY of 46.08% and a g _lum of 2.1 × 10 ⁻² , underscoring its remarkable CPL performance and spectral tunability. Near‐ultraviolet pumped white light shows 25.5% polarization. This study offers a new strategy for crafting chiral 0D HMHs with tunable spectra, high PLQY, and elevated g _lum .