Progress in Polymer‐Based Pure Organic Room Temperature Phosphorescent Materials

To date, organic room-temperature phosphorescent (RTP) materials have received much attention due to their long lifetime and large Stokes shift, and have been widely used in anti-counterfeiting encryption, bio-imaging, and sensing and monitoring. Researchers have used a variety of approaches to construct ultra-long, efficient RTP materials, with the confinement of chromophores in polymers being widely favored to improve RTP performance. The polymer entanglement structure restricts the vibration and rotation of the chromophore, which successfully suppresses the non-radiative excitation of the triplet exciton and protects the triplet exciton from the external environment (oxygen, water), which is conducive to the realization of the ultra-long and bright RTP emission, and makes the RTP material easy to process, which broadens the application range of the RTP material. This review summarizes recent advances in the study of polymeric RTP materials, the underlying mechanisms and design strategies, discusses the RTP properties of chromophores in amorphous and crystalline polymers respectively, as well as the latest applications of RTP polymers, and finally discusses the challenges for the development of RTP polymers and the outlook for the future.