(651c) Tunable Light-Matter Interactions in Complex Perovskite-Coated Particles with Multiscale Chirality

Chiral nanostructures display chirality at multiple scales – from angstroms to microns and display high chiroptical activity. They encompass a wide range of materials including polymers, nanocarbons, metals, ceramics, and semiconductors. However, the synthesis of nanomaterials of specific chemical nature with a specific set of chiral geometry at specific scale remains a difficult Edissonian process. Among them are perovskites - a large class of highly photoactive materials. The synthesis of perovskite particles with tunable chirality at higher scales is limited by their crystallization patterns and molecular precursors. Here we show that generic achiral perovskites can be deposited on pre-made chiral ‘hedgehog’ particles (CHIPs) producing optically hybrid materials with spectroscopic bands specific of perovskites and chirality specific of the templates. Left- and right-handed circularly polarized light emission was observed from the hybrid particles and is determined by the geometry of the template CHIPs. The spectral position of chiroptical bands and the analysis of the dissymmetry factors indicate that the circular polarization of perovskite luminescence is dominated by the post-emission scattering by the chiral surfaces in CHIPs. The template pathway is convenient for crafting a wide range of nanostructured chiroptical materials and tunable single-particle emitters.