| abstract |
The invention belongs to the technical field of OLED and provides a boron heterocyclic compound having a structure represented by formula (I); wherein, L is a single bond, substituted or unsubstituted phenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted Any one of the substituted anthracene groups; D is mainly selected from carbazolyl and its derivative groups, acridine and its derivative groups, and diarylamine and its derivative groups. The boron heterocyclic compound of the present invention connects the acceptor group through the sp3 hybridized connecting part of the boron heterocyclic ring, which can not only shorten the conjugation length, increase the energy level, but also improve the thermodynamic stability of the molecule. At the same time, the short-axis conjugation weakens the intramolecular charge transfer and narrows the luminescence spectrum to a certain extent. The compound of the present invention can be used as a TADF material. Since the TADF material itself has bipolarity, as a light-emitting layer, the injection and transport of two carriers will be greatly improved, thereby reducing the device voltage. The light-emitting layer of the light-emitting device comprising the compound of the present invention does not contain precious metals, which can greatly reduce the cost. |