Circularly Polarized Luminescence from Chiral Photonic Crystals of Caesium Lead Halide Perovskites

The generation and detection of circularly polarized light (CPL) are of importance in many modern technologies such as digital communications, machine vision, bio-imaging, and 3D displays. In this study, inspired by the fact that various species of plants and animals can efficiently produce and/or perceive CPL with chiral photonic crystal structures, efforts are made to fabricate luminescent chiral photonic crystals with caesium lead halide perovskites, a class of solution-processable semiconductors that have excellent luminescence properties and readily tunable electronic band gaps. Coupling between the emission frequency of the perovskite and the cavity resonance frequency of the photonic crystal structure can be established at any desired point in the visible region, giving rise to CPL output with a dissymmetry factor up to -0.34. These results suggest a new approach to chiral light-emitting materials and may contribute to the development of semiconductors with ordered microstructures. Semiconducting chiral photonic crystals possessing tunable electronic and photonic band gaps are fabricated with caesium lead halide perovskites, where the coupling between emission and cavity resonance frequencies can be easily established at a specific wavelength in the visible region, thus enabling circularly polarized luminescence with a red, green, or blue color.image

Automated summary

Luminescent chiral photonic crystals with tunable electronic and photonic band gaps have been fabricated using caesium lead halide perovskites. The coupling between the emission frequency and cavity resonance frequency allows for the generation of circularly polarized luminescence in the visible region.