Photosensitization-Controlled Dynamic Organic Room-Temperature Phosphorescence

Dynamic organic room temperature phosphorescence (RTP) materials have enabled potential applications in intelligent optoelectronics owing to their reversibly dynamic luminescence features. However, in most reported dynamic RTP materials, chromophores serve dual roles as phosphorescent emitters and oxygen sensitizers. This leads to uncontrollable dynamic processes and a reduction in phosphorescence performance. Herein, we present a strategy for achieving controllable dynamic RTP and maintaining the phosphorescent performance by integrating triplet photosensitizers into the RTP polymer. Specifically, by adjusting the concentration of the photosensitizer, the photoactivation time of the copolymers can be accurately controlled within the range of 3-30 s. Notably, after photoactivation, the phosphorescence lifetime of the polymer was prolonged from 558 to 1017 ms, which is longer than that of the polymer lacking a photosensitizer. The versatility of the design strategy was further validated by synthesizing a diverse range of RTP polymers through copolymerization and physical doping, as well as by employing alternative photosensitizers. Given the dynamic RTP feature, we demonstrated potential applications in dynamic intelligent afterglow displays and multilevel information encryption. This work advances the development of controllable dynamic RTP polymers and expands the application scope of stimuli-responsive materials in intelligent optoelectronics.