Patent ID: 7935962

Claim:
An organic electroluminescent device comprising: an anode; a cathode; and an organic layer held between them which includes a light-emitting layer, a naphthacene compound layer containing a naphthacene compound, and an electron transport layer; said light-emitting layer being composed of a light-emitting guest material and an aromatic hydrocarbon compound having the skeleton of anthracene, and said naphthacene compound layer containing no less than 80 wt % of naphthacene compound represented by the formula (1) below and having a thickness of 0.5 to 10 nm and being in contact with that side of said electron transport layer which faces said light-emitting layer where, R 1 to R 8 independently denote a hydrogen atom, halogen atom, hydroxyl group, cyano group, nitro group, any of carbonyl group, carbonyl ester group, alkyl group, alkenyl group, and alkoxyl group, which may be substituted with a group having no more than 20 carbon atoms, and any of silyl group, aryl group, and heterocyclic group, which may be substituted with a group having no more than 30 carbon atoms.