Patent ID: 8758904

Claim:
An organic electroluminescent device comprising at least a light-emitting layer and an electron-transporting layer between an anode and a cathode facing each other wherein the electron-transporting layer consists of a first electron-transporting layer and a second electron-transporting layer, the first electron-transporting layer and the second electron-transporting layer are arranged sequentially in this order from the side of the light-emitting layer to the side of the cathode, and the first electron-transporting layer contains a compound represented by the following general formula (1): wherein ring a is an aromatic or heterocyclic ring fused to two adjacent rings and represented by formula (a1) or (a2), ring a′ is an aromatic or heterocyclic ring fused to three adjacent rings and represented by formula (a1), X 1 is CH or N, and ring b is a heterocyclic ring fused to two adjacent rings and represented by formula (b1); Ar 1 to Ar 4 each is independently a substituted or unsubstituted aromatic hydrocarbon group or a substituted or unsubstituted aromatic heterocyclic group, wherein the unsubstituted aromatic hydrocarbon groups are aromatic hydrocarbon groups of 6-10 carbon atoms, and the unsubstituted aromatic heterocyclic groups are aromatic heterocyclic groups of 2-5 carbon atoms, in the case where the aromatic hydrocarbon groups or aromatic heterocyclic groups contain substituents, said substituents are selected from the group consisting of an alkyl group of 1-10 carbon atoms, an aralkyl group of 4-15 carbon atoms, an alkoxyl group of 1-15 carbon atoms, an amino group, an aromatic hydrocarbon group of 6-18 carbon atoms, and an aromatic heterocyclic group of 3-17 carbon atoms; R 1 to R 3 each is independently a hydrogen atom, an alkyl group, an aralkyl group, an alkenyl group, an alkynyl group, a cyano group, a dialkylamino group, a diarylamino group, a diaralkylamino group, an amino group, a nitro group, an acyl group, an alkoxycarbonyl group, a carboxyl group, an alkoxyl group, an alkylsulfonyl group, a haloalkyl group, a hydroxyl group, an amide group, a substituted or unsubstituted aromatic hydrocarbon group, or a substituted or unsubstituted aromatic heterocyclic group; X 2 , X 3 , and X 4 each is independently CH or N and at least one of them is N.