Circularly Polarized Luminescent Behavior of Delayed Fluorescence Liquid Crystals Based on Carbonized Polymer Dots

Abstract Circularly polarized luminescence (CPL) as modern photonic technology is essential for optical apparatuses, anti‐counterfeiting, and information encryption. However, it still faces the formidable challenge of integrating delayed fluorescence into CPL through harvesting the triplet excitons. Herein, a carbonized polymer dot liquid crystal (CPDs‐Chol) is reported that shows both circularly polarized fluorescence (CPF) and circularly polarized delayed fluorescence (CP‐DF). In order to realize the CP‐DF, a kind of CPDs‐Chol is successfully designed and synthesized through grafting cholesterol molecules on the surface of novel carbonized polymer dots (CPDs) possessing long afterglow of 13 s. Then, the resultant CPDs‐Chol is doped with 4‐cyano‐4‐pentylbiphenyl (5CB) in different ratios to fabricate CPL material, which shows the highest g_lum of −0.5 and −0.042 for CPF and CP‐DF, respectively. The combination of the CPL feature and the long afterglow of CPDs‐Chol@5CB and CPDs offer an attractive photonic technology with advanced applications in anti‐counterfeiting and information encryption.