(73c) Perovskite-Coated Biomimetic Chiral Microparticles with Circularly Polarized Light Emission

A range of single-particle emitters spanning the visible spectrum and exhibiting circular polarization are formed by the coating of hybrid organic-inorganic perovskite (HOIP) onto chiral microparticles. The tunable nature of the particles allows for emissions that span the visible spectrum, while also maintaining a modest degree of circular polarization. We investigate the influence of the nanoscale and sub-microscale substrate chirality on circularly polarized light emission. This is accomplished through integrating tunable perovskite light emitters onto a substrate of hierarchically assembled biomimetic chiral microparticles of various sizes. Through a novel coating technique, we show single-particle emitters with a dissymmetry factor (g_lum) up to 10^-3. The color and dissymmetry of the emission can be controlled by the composition of the perovskite and the size/helicity of the chiral substrate, pointing to the system's potential application as tunable single-particle CPL emitters. Furthermore, the CPL intensity is not heavily influenced by the concentration of CPL emitters, showing that the CPL mechanism is dominated by scattering events at the substrate rather than through bulk or colligative properties of a collection of particles.