Research progress of organic circularly polarized room temperature phosphorescent materials based on cholesteric liquid crystals
Circularly polarized room temperature phosphorescence(CP-RTP)materials are widely used in biological imaging,information encryption and anti-counterfeiting due to their unique photophysical properties.In recent years,researchers have discovered that highly ordered supramolecular assemblies contribute to improving the phosphorescent dissymmetry factor gPh.Cholesteric liquid crystals(CLCs)with helical superstructures exhibit a chirality amplification effect.Moreover,these periodic helical-stacking superstructures possess selective reflection of CP light,enabling the generation of strong CPL with high gPh values.The CLCs selectively reflect CPL with the same helical handedness,while transmitting CPL with the opposite helical handedness as that of the CLCs.This review analyzes the effect of helical superstructures on photophysical properties,and provides a clear summary of recent cholesteric CP-RTP materials and their applications in information encryption and anti-counterfeiting.
circularly polarized organic room temperature phosphorescencecholesteric liquid crystalphosphorescent dissymmetry factor