Spiral-fluorene-integrated sterically shielded multi-resonance TADF emitter: simultaneously achieving narrowband emission and restraining Dexter energy transfer - Jiasen Zhang; Hao Liu; Lin Wu; Kaibo Fang; Deli Li; Denghui Liu; Xuewei Nie; Letian Xu; Zujin Zhao; Wei Li; Ziyi Ge (Science Bulletin, 2026)