Charge Separation-Induced Multicolor Circularly Polarized Long-Persistent Luminescence in Chiral Liquid Crystal...

Circularly polarized organic long-persistent luminescence (CP-OLPL) materials constitute a distinct class of afterglow systems that synergistically combine long-lived emission with intrinsic chiral optical activity, enabling sustained luminescence without continuous excitation. These materials have attracted considerable attention for applications in temporal resolution, information encoding, and multifunctional photonic platforms. Despite recent progress, most reported CP-OLPL materials suffer from limited emission color tunability, moderate luminescence dissymmetry (g_lum), and restricted control over chiro-optical performance, which greatly constrains their practical utility. Herein, we report a versatile strategy that combines charge-separated states with the helical self-assembly of chiral liquid crystals. Chiral polymer matrices are prepared via copolymerization of cholesterol and cyanobiphenyl mesogens containing electron-withdrawing cyano groups. Fluorescent electron-donor molecules are incorporated to generate charge-separated states via long-range charge transfer. By tuning the type and concentration of these fluorescent dopants, emission colors spanning from green to red are achieved, with a maximum lifetime of 499.8 ms and an afterglow lasting up to 6.0 s. Furthermore, matching the selective reflection of the chiral matrix with the emission band significantly enhances CPL performance. The PBiCN-60@RhB 1.0%) sample exhibits the strongest CPL signal, with a maximum g_lum of -1.01. In addition, their potential applications in cryptography and data security are explored.