发光学报2026，Vol.47Issue(2)：299-306,8.DOI:10.37188/CJL.20250241
利用联苯扭曲骨架实现电子解耦的蓝光双极主体材料
Blue Bipolar Host Materials Achieved Through Electronic Decoupling via A Twisted Biphenyl Skeleton
摘要
Abstract
Addressing the persistent challenge in blue phosphorescent devices of balancing high triplet energy lev-els with balanced charge carrier transport in host materials,this study proposes a novel"spatial hindrance-induced electronic decoupling"strategy.By constructing D-A-type host materials(N,N-diphenyl-2′-tosyl-[1,1′-biphenyl]-2-amine/N,N-di-p-tolyl-2′-tosyl-[1,1′-biphenyl]-2-amine)with multiple twisted conformations via the 2,2′-position of a biphenyl skeleton,a synergistic combination of a high triplet energy level(2.66 eV)and bipolar charge trans-port properties was successfully achieved.Theoretical calculations and experimental characterizations confirm that spatial hindrance effectively suppresses electronic coupling between the donor and acceptor units,maintaining a high-energy structure dominated by localized excited states.Device performance validated the advantages of this strategy in exciton confinement and charge carrier balance,while also revealing limitations in efficiency due to molec-ular conformational dynamic instability.This study identifies the dynamic conformational stability of molecules as a critical constraint on device efficiency in steric-hindrance-based blue host materials,thus providing a clear design principle for performance breakthrough through enhanced structural rigidity.关键词
联苯骨架/主体材料/空间位阻Key words
biphenyl skeleton/host material/steric hindrance分类
数理科学引用本文复制引用
刘腾霄,朱联旺..利用联苯扭曲骨架实现电子解耦的蓝光双极主体材料[J].发光学报,2026,47(2):299-306,8.基金项目
浙江省自然科学基金(LQ19E030015)Supported by Natural Science Foundation of Zhejiang Provincial(LQ19E030015) （LQ19E030015）
