Efficient green emission of circularly polarized luminescence from chiral Ruddlesden–Popper perovskites stabilized in mesoporous silica with alloyed spacer cations

The combination of the rigid structure of mesoporous silicon with potential chiral quasi-two-dimensional (quasi-2D) perovskite properties has opened up a promising avenue for chiral metal halide perovskite materials in the field of circularly polarized luminescence (CPL). However, achieving a delicate balance among multiple key parameters such as a high figure-of-merit (FM = luminescence dissymmetry factor (<i>g</i>_lum) × photoluminescence quantum yield (PLQY)) factor and stability has been proven to be a challenging task. Here, we report a simple encapsulation strategy for crafting stable and bright organic-inorganic hybrid CPL-active nanocomposites. The materials utilize an ordered SBA15 template to provide a physically confined environment for the <i>in situ</i> growth of chiral quasi-2D perovskite nanocrystals, effectively suppressing bromine defects. Meanwhile, the combination of the chiral ligand <i>R</i>/<i>S</i>-cyclohexylethylamine and the achiral ligand 4-fluorophenethylamine regulates the multi-<i>n</i> phase distribution, which reduces non-radiative recombination to improve PLQY. Moreover, the protection of the SBA15 matrix enhances the stability of composite powders against harsh conditions such as light, heat, and environment stress. The resulting composites can be readily employed in circularly polarized light-emitting diode devices. This research is poised to provide a novel and feasible pathway for the large-scale production of chiral perovskite nanomaterials and their applications in circularly polarized light-emitting technologies.