Authors: Minyi Wu, Yan Guan, Pu Wang, Tian‐Tian Hao, Jie Li, Wei Yuan, Jiang Huang, Pengfei Duan, Ping Wang, He‐Lou Xie
Published: 2025-05-06
Source: Full article
AbstractOrganic phosphorescence holds significant potential for its important applications in sensors, optoelectronics, and security technologies. However, achieving long‐lived blue phosphorescence, particularly at high temperatures, remains a significant challenge. In this work, an unusual thermally enhanced blue phosphorescence is investigated and observed in a readily synthesized polymer (P1), which is created by copolymerizing acrylamide with a phenyl terpyridine‐containing monomer (M1). Remarkably, P1 exhibits ultra‐long cyan phosphorescence at 493 nm with a lifetime of 1.04 s at room temperature and an enhanced blue phosphorescence at 450 nm when exposed to a high temperature of 150 °C. Experimental and simulation results suggest that the high‐temperature blue phosphorescence originates from thermally activated rotation of the phenyl terpyridine group, triggering a conformational transition from the low‐energy Iso2 to the high‐energy Iso3 state. Furthermore, this heat‐resistant phosphorescent polymer can be easily fabricated into a high‐temperature optical waveguide with a low optical loss coefficient, making it suitable for high‐performance optical switches. This work provides a novel strategy for designing high‐temperature‐resistant phosphorescent materials, with promising applications in advanced photonic and optoelectronic devices.