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Abstract

Chiral lead halide perovskites have captivated considerable attentions due to their distinctive attributes, such as ferroelectricity, spin-dependent transport, and chiroptical activity. However, lead toxicity and weak circularly polarized luminescence (CPL) have cast a pall over their practical applications. Here, a series of 0D lead-free chiral enantiomorphic hybrids, such as (R-/S-MBA)₃In_1-xSb_xCl₆ (x = 0–1) is successfully developed. By optimizing the Sb³⁺ doping concentration to 0.55%, the resultant (R-/S-MBA)₃In_99.45%Sb_0.55%Cl₆ not only shows a near-unity quantum yield but also emanates potent CPL, boasting a dissymmetry factor (g_lum) of 6.3 × 10^–3. These efficient CPL activities are intricately tied to the presence of a twisted luminescent cluster [SbCl₆]^3– induced by structural chirality. The comprehensive results reveal that the emission of the chiral perovskite originated from self-trapped excitons (STEs) of 5s² Sb³⁺ ions. Moreover, (MBA)₃In_99.45%Sb_0.55%Cl₆ single crystals also exhibit bright orange emission and UV detector signals. These findings will pave the way for the further investigation in efficient CPL and detectors based on lead-free chiral optoelectronic materials.