A dibenzo[a,c]phenazine-11,12-dicarbonitrile (DBPzDCN) acceptor based thermally activated delayed fluorescent compound for efficient near-infrared electroluminescent devices

Abstract

In this paper, a near-infrared (NIR) TADF molecule with dibenzo[a,c]phenazine-11,12-dicarbonitrile (DBPzDCN) as the acceptor has been designed, synthesized and characterized. Connecting the DBPzDCN core with a diphenylamine (DPA) donor, NIR emission is successfully achieved. The relationship between the molecular structure and optoelectronic properties is discussed experimentally and theoretically. A high external quantum efficiency (EQE) of 7.68% with an emission peak at 698 nm and Commission Internationale de L’ Eclairage (CIE) coordinates of (0.68, 0.30) was achieved in a NIR organic light-emitting diode.