Polymer-bridging energy transfer enables full-color erasable room-temperature phosphorescence with high stability in...

Achieving full-color, erasable, and stable photoactivated room-temperature phosphorescence (RTP) is often hindered by inefficient intersystem crossing, rapid triplet quenching and a low driving force for oxygen consumption, especially for deep-blue and red emissions. Herein, full-color photoactivated RTP materials, with ultralong emission lifetimes up to 4.18 s and reversibility over multiple write-erase cycles, are fabricated by doping organic phosphors into a polyvinyl butyral (PVB) polymer matrix. Unlike conventional inert hosts, PVB acts as an active energy transfer bridge that enhances host-guest energy transfer, promotes intersystem crossing and facilitates efficient oxygen consumption across a broad spectral range of 430-670 nm. The resulting films exhibit excellent stability in humid, acidic, alkaline, and saline environments, as well as full recyclability. Leveraging these properties, erasable photopatterning across multiple colors and scales, including large-area (20 × 20 cm) and fine-feature (2 mm) patterns, is demonstrated. Our results provide a general strategy to overcome key limitations in light-responsive RTP materials for dynamic anti-counterfeiting and rewritable data storage.