Utilizing d‐pπ Bond for Ultralong Organic Phosphorescence

Developing pure organic materials with ultralong lifetimes is attractive but challenging. Here we report a concise chemical approach to regulate the electronic configuration for phosphorescent enhancement. After introduction of d‐pπ bonds in phenothiazine model, up to 19 times phosphorescence lifetime enhancement was observed for DOPPMO, compared with the reference PPMO. A record phosphorescence lifetime of up to 876 ms was obtained in phenothiazine phosphors. Theoretical calculations and single crystal analysis reveal that the d‐pπ bond not only reduces the (n, π*) proportion of T1, but also frames rigid molecular environment with multiple intermolecular interactions, thus enabling long‐lived phosphorescence. This finding will take a giant step forward in prolonging phosphorescence lifetime and extending the scope of phosphorescent materials.

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