Color-Tunable Circularly Polarized Room-Temperature Phosphorescence by Intermolecular Phosphorescence Resonance Energy Transfer in a Chiral Co-assembled Liquid Crystal Polymer Network.

Circularly polarized room-temperature phosphorescent (CP-RTP) materials have been attracting great attention due to their potential applications in anticounterfeiting. In this study, we designed and synthesized a host-guest copolymer () with strong phosphorescence emission and a long emission lifetime using a self-doping strategy. The co-assembled liquid crystal polymer networks / doped with demonstrated a stronger RTP emission and longer lifetime (τ = 148 ms). Among them, showed strong CP-RTP signals (|| = 0.071) through chiral supramolecular co-assembly. By dropping Nile Red () into /, the resulting / emitted intense red circularly polarized luminescence (CPL) of dye (λ = 636 nm and || = 0.073) with a long lifetime (τ = 26 ms) under the regulation of an intermolecular phosphorescence resonance energy transfer (PRET) mechanism. Additionally, / has been explored for applications in time-varying information encryption and quadruplex anticounterfeiting information encryption through the PRET progress.