Details

Autor(en) / Beteiligte

• Tian, Shuai
• Ma, Huili
• Wang, Xuan
• Lv, Anqi
• Shi, Huifang
• Geng, Yun
• Li, Jie
• Liang, Fushun
• Su, Zhong‐Min
• An, Zhongfu
• Huang, Wei

Titel

Utilizing d–pπ Bonds for Ultralong Organic Phosphorescence

Ist Teil von

• Angewandte Chemie International Edition, 2019-05, Vol.58 (20), p.6645-6649

Auflage

International ed. in English

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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. Glowing longer: The introduction of d–pπ bonds was utilized to prolong organic phosphorescence lifetimes. The luminogen N‐acetyl phenothiazine‐S,S‐dioxide (DOPEO) shows an ultralong lifetime of 876 ms with a phosphorescence quantum yield of 8.2 %, which are the highest values among phenothiazine‐based organic phosphorescent substances.