Abstract

We report organic electroluminescence (EL) devices based on a novel emissive molecule, 2-[4′-(N,N-dimethylaminophenyl)]-2,3-dihydroquinazolin-4(1H)-one (MAPQ). A three-layer structure consisting of MAPQ as emissive layer sandwiched between a hole transporting layer, N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1-biphenyl-4,4′-diamine (TPD), and an electron transporting layer, tris(8-hydroxyquinolinato)aluminium (Alq₃), ITO/TPD/MAPQ/Alq₃/Al gave rise to a greenish-yellow peak located at around 538 nm, with coordinates (x = 0.447 and y = 0.510) in accordance with the Commission Internationale de L'Eclairage. An EL external quantum efficiency (η_ext) of 0.07% at 125 A m² and a brightness of 992 cd m⁻² were observed, and the η_ext is nearly constant or stable over a wide range of current densities (3–300 A m⁻²).