Circularly Polarized Room-Temperature Phosphorescence from Dye-Doped Cholesteric Liquid Crystalline Polymer Networks

Circularly polarized luminescence (CPL) materials have drawn increasing attention for their potential applications in optical displays and chemo/biosensing. Nevertheless, the construction of circularly polarized room-temperature phosphorescence (CPRTP) materials is still a significant challenge. In this work, four liquid crystalline polymer network films with RTP properties have been fabricated via photopolymerization of cholesteric liquid–crystalline mixtures containing different amounts of commercially available dyes. The films show a yellow–green structural color, enhanced RTP, blue CPL, and green CPRTP with phosphorescence dissymmetry factors up to −0.90, quantum yields up to 14.8%, and emission lifetimes up to 607 ms. Furthermore, the prepared film pattern presents different colors in reflective, fluorescent, and phosphorescent modes. This work not only provides a deep understanding of RTP and CPRTP, but also presents a facile strategy to fabricate film patterns for decoration and anticounterfeiting applications.