磷光
系统间交叉
分子内力
激子
光化学
三重态
分子
有机发光二极管
化学
材料科学
化学工程
荧光
单重态
原子物理学
立体化学
物理
激发态
有机化学
量子力学
图层(电子)
作者
Junru Chen,Xiaojie Chen,Lei Cao,Huangjun Deng,Zhenguo Chi,Bin Liu
标识
DOI:10.1002/ange.202200343
摘要
Abstract The traditional method to achieve ultralong organic phosphorescence (UOP) is to hybrid nπ* and ππ* configurations in appropriate proportion, which are contradictory to each other for improving efficiency and lifetime of phosphorescence. In this work, through replacing the electron‐donating aromatic group with a methoxy group and combining intramolecular halogen bond to promote intersystem crossing and suppress non‐radiative transition, an efficient UOP molecule (2Br‐OSPh) has been synthesized with the longest lifetime and brightest UOP among its isomers. As compared to CzS2Br, which has a similar substituted position of bromine atom and a larger k isc (the rate of intersystem crossing), the smaller Δ E TT* (the energy gap between monomeric phosphorescence and aggregated state phosphorescence) in 2Br‐OSPh could accelerate the transition from T 1 to T 1 *. This research indicates that both generation and accumulation of triplet excitons play an important role in realizing efficient UOP materials.
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