磷光
系统间交叉
咔唑
取代基
单重态
量子产额
荧光粉
位阻效应
材料科学
光化学
三重态
化学
光电子学
有机化学
分子
原子物理学
光学
荧光
物理
激发态
作者
Yu Xiong,Zheng Zhao,Weijun Zhao,Huili Ma,Qian Peng,Zikai He,Xuepeng Zhang,Yuncong Chen,Xuewen He,Jacky W. Y. Lam,Ben Zhong Tang
标识
DOI:10.1002/anie.201800834
摘要
Abstract Pure organic materials with ultralong room‐temperature phosphorescence (RTP) are attractive alternatives to inorganic phosphors. However, they generally show inefficient intersystem crossing (ISC) owing to weak spin–orbit coupling (SOC). A design principle based on the realization of small energy gap between the lowest singlet and triplet states (ΔE ST ) and pure ππ* configuration of the lowest triplet state (T 1 ) via structural isomerism was used to obtain efficient and ultralong RTP materials. The meta isomer of carbazole‐substituted methyl benzoate exhibits an ultralong lifetime of 795.0 ms with a quantum yield of 2.1 %. Study of the structure–property relationship shows that the varied steric and conjugation effects imposed by ester substituent at different positions are responsible for the small ΔE ST and pure ππ* configuration of T 1 .
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