利用联苯扭曲骨架实现电子解耦的蓝光双极主体材料

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中图分类号：0482.31 DOI：10.37188/CJL.20250241

文献标识码：A

BlueBipolar HostMaterials Achieved Through Electronic Decoupling via A TwistedBiphenyl Skeleton

LIU Tengxiaol*，ZHU Lianwang² （1.ChangjiangInstituteofTechnology，Wuhan430212，China; 2.LushuiTrialMultipurposeProjectAdministrationofChangjiang WaterResourcesCommission，Chibi4373oo，China） * Corresponding Author，E-mail：20221028@cjit.edu.cn

Abstract：Addressing the persistent challenge in blue phosphorescentdevices of balancing high triplet energy levels withbalanced chargecarier transport inhostmaterials，thisstudyproposes anovel“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 multipletwistedconformationsvia the 2，2′ -position of abiphenylskeleton，asynergisticcombinationofahightripletenergylevel（2.66eV）andbipolar charge transport properties was successullyachieved.Theoretical calculations and experimental characterizations confirm that spatial hindrance effectively suppresses electronic coupling between the donor and acceptor units，maintaining a high-energy structure dominatedby localized excited states.Deviceperformancevalidated theadvantages of this strategy inexcitonconfinementandchargecarierbalance，whilealsorevealinglimitationsineficiencyduetomolecularconformational dynamic instability.This study identifiesthedynamicconformational stabilityof molecules as a critical constraint ondeviceeficiencyinsteric-hindrance-based blue host materials，thusproviding a clear design principle forperformance breakthrough through enhanced structural rigidity.

Keywords：biphenyl skeleton；hostmaterial;sterichindrance

1引言

随着客体材料发光机理研究的不断深人，有机电致发光器件尤其蓝光器件近年来取得了极大的进展1-5。（剩余11411字）