Highly Emissive Chiral Indium-Based Perovskite Single Crystals for Efficient Optoelectronic Applications

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)3In1-xSbxCl6 (x = 0-1) is successfully developed. By optimizing the Sb3+ doping concentration to 0.55%, the resultant (R-/S-MBA)3In99.45%Sb0.55%Cl6 not only shows a near-unity quantum yield but also emanates potent CPL, boasting a dissymmetry factor (glum) of 6.3 x 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)3In99.45%Sb0.55%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. 0D perovskites are expected to show excellent luminescent properties due to their strong quantum confinement, a pair of high emissive chiral 0D indium-based perovskites with near-unity PLQY and high glum of 6.3 x 10-3 is achieved. Additionally, high-efficiency and stable photovoltaic devices are developed, paving the way for the developments of future green and high-efficiency circularly polarized optical devices. image