Organic electroluminescent element

摘要

Disclosed is an organic electroluminescent element which can be produced by a wet process, has improved laminated structure, and also has improved external quantum efficiency and an improved service life. The organic electroluminescent element comprises at least an anode; a cathode and a laminated structure intercalated between the anode and the cathode, all of which are arranged on a substrate, wherein the laminated structure has at least four layers formed by a wet process, and wherein the layers produced by the wet process include at least a hole injection layer, a hole transport layer and a light-emitting layer. The organic electroluminescent element is characterized in that the hole injection layer comprises an electrically conductive polymer, the hole transport layer comprises a polymeric compound having a repeating unit represented by general formula (1), and the polymeric compound has a weight average molecular weight of 50,000 to 200,000 in terms of polystyrene content.

主权项

1. An organic electroluminescence element comprising a substrate having thereon at least an anode, a cathode and a laminated layer structure sandwiched between the anode and the cathode, wherein the laminated layer structure comprises at least four layers produced by a wet process, and a hole injection layer, a hole transport layer and a light emitting layer are contained in the at least four layers produced by the wet process,
wherein the hole injection layer contains a conductive polymer, the hole transport layer contains a polymer having a repeating unit represented by Formula (1), and the polymer has a weight average molecular weight of 55,000 to 80,000 as a polystyrene conversion value, wherein Ar1 and Ar3 each independently represent an unsubstituted or substituted arylene group which is selected from the group consisting of a phenylene group, a biphenylene group and two phenylene groups conneted by a spacer group, the spacer group is selected from the group consisting of Ar2 and Ar4 each independently represent an aryl group or an aromatic heterocyclic group which is unsubstituded or substituted with a substituent selected from the group consisting of an aryl group and an alkoxy group; n1 and n2 are integer of 0 to 2, provided that n1 and n2 are not simultaneously 0.