Polyimides with Excited‐State Intramolecular Proton Transfer and Room‐Temperature Phosphorescence Properties by End‐capping. - Ding, Qiuyue; Yang, Fuyu; Tian, Quanchi; Xu, Chao; Qu, Lunjun; Wang, Kaiti; Yang, Chaolong (Chemistry - A European Journal, 2025)