Organic Long‐Persistent Luminescence from a Thermally Activated Delayed Fluorescence Electron Donor‐Acceptor Binary System

Organic long-persistent luminescence (OLPL) based on long-lived charge-separated (CS) states shows considerable emission persistence time owing to the ability store absorbed photon energy. Herein, a novel electron donor-acceptor (D–A) binary system consisting of donor 4,4,4-tris[3methylphenyl(phenyl)amino]triphenylamine and acceptor tris-[3-(3-pyridyl)mesityl]borane is designed investigated for outstanding OLPL performance. It found that proposed exhibits effective lasted more than 100 s after 1 min ultraviolet light irradiation at room temperature (292 K). Moreover, this D–A also thermally activated delayed fluorescence prior emission. Both types are be temperature-sensitive, which believed result from occurrence reverse intersystem crossing formation CS state, respectively. The findings enrich materials clarify rich excited-state transitions during systems.