Bright red light-emitting organic electroluminescent devices based on a novel thiophene-containing europium complex as an emitting layer

Abstract

A novel europium complex, Eu(DTP)3(dipphen) (DTP=1,3-di(2- thienyl)propane-1,3-dione, dipphen=4,7- diphenyl-1,10-phenanthroline), has been synthesized and applied to organic electroluminescent (EL) devices as an emitting and electron-transporting material. The EL device structure can be described as indium tin oxide (ITO)/hole-transporting layer (triphenyldiamine derivative (TPD))/emitting layer (Eu(DTP)3(dipphen))/electron transport layer (Alq3)/AlLi (99:1). The emitting layers were formed by a codeposition technique. The deposited EL devices were observed to emit a bright red light originating from Eu(DTP)3(dipphen) with a maximum luminance of 450 cd m-2 at 15 V and 200 mA cm-2.