1220-99-1Relevant academic research and scientific papers
Utilizing d–pπ Bonds for Ultralong Organic Phosphorescence
Tian, Shuai,Ma, Huili,Wang, Xuan,Lv, Anqi,Shi, Huifang,Geng, Yun,Li, Jie,Liang, Fushun,Su, Zhong-Min,An, Zhongfu,Huang, Wei
, p. 6645 - 6649 (2019)
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 T1 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.
