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Utilizing d–pπ Bonds for Ultralong Organic Phosphorescence
Author(s) -
Tian Shuai,
Ma Huili,
Wang Xuan,
Lv Anqi,
Shi Huifang,
Geng Yun,
Li Jie,
Liang Fushun,
Su ZhongMin,
An Zhongfu,
Huang Wei
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201901546
Subject(s) - phosphorescence , phosphorescent organic light emitting diode , photochemistry , intermolecular force , materials science , phenothiazine , chemistry , fluorescence , molecule , organic chemistry , physics , optics , medicine , pharmacology
Developing pure organic materials with ultralong lifetimes is attractive but challenging. Here we report a concise chemical approach to regulate the electronic configuration for phosphorescence enhancement. After the introduction of d–pπ bonds into a phenothiazine model system, a phosphorescence lifetime enhancement of up to 19 times was observed for DOPPMO, compared to the reference PPMO. A record phosphorescence lifetime of up to 876 ms was obtained in phosphorescent phenothiazine. Theoretical calculations and single‐crystal analysis reveal that the d–pπ bond not only reduces the (n, π*) proportion of the T 1 state, but also endows the rigid molecular environment with multiple intermolecular interactions, thus enabling long‐lived phosphorescence. This finding makes a valuable contribution to the prolongation of phosphorescence lifetimes and the extension of the scope of phosphorescent materials.