Polymer Blend Films with High-Temperature Phosphorescence and Circularly Polarized Luminescence

Circularly polarized room-temperature phosphorescence (CP-RTP) materials emit persistent polarized light due to long triplet excited-state lifetimes and operate without cryogenic conditions, expanding their applications in 3D displays and chiral optical devices. Current polymer-based CP-RTP materials, which often relying on doped small molecules, face challenges with phosphorescent unit leaching and migration. This leads to environmental concerns and compromised chiroptical performance. To address these limitations, we introduce a polymer blend strategy. This strategic blend ensures stable and efficient CP-RTP emission, fundamentally preventing phosphorescent unit leaching and improving environmental friendliness. In this study, we synthesized four chiral phosphorescent polymers via copolymerization with acrylamide, which were then blended with poly(vinyl alcohol). The resulting films exhibited excellent transparency (65–80% transmittance in the visible region) and strong CP-RTP at approximately 505 nm, with phosphorescence lifetimes up to 658.6 ms and a dissymmetric factor of ( g lum ) 8.0 × 10 –3 . Notably, the phosphorescence lifetimes of the blend films increased by 8–84% compared to their nonblended counterparts. Furthermore, these polymer blend films exhibited significant phosphorescence emission, with lifetimes reaching up to 568 ms even at an elevated temperature of 410 K. These materials hold considerable potential for anticounterfeiting technologies and offer opportunities to diversify applications by modulating afterglow color through Förster resonance energy transfer. This approach contributes to the development of high-performance, durable, and sustainable CP-RTP materials.