Efficient Green Emission of Circularly Polarized Luminescence from Chiral Ruddlesden-Popper Perovskites Stabilized in Mesoporous Silica with Alloyed Spacer Cations

Abstract

The combination of the rigid structure of mesoporous silicon with the 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 between multiple key parameters such as high figure of merit (FM = luminescence dissymmetry factors (glum) × 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 the ordered SBA15 template to provide a physical constraint environment for the in-situ growth of chiral quasi-2D perovskite nanocrystals, effectively addressing bromine defects. Meanwhile, the combination of chiral ligand R/S-cyclohexylethylamine and achiral ligand 4-fluorophenethylamine regulates the multi-n phase distribution, which reduces non-radiative recombination to improve PLQY. Moreover, the protection of SBA15 matrix enhances the stability of composite powders against harsh conditions such as light, heat, and environment. 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.