Patent ID: 7651786

Claim:
An electroluminescence device comprising a pair of electrodes and a layer of an organic light emitting medium disposed between the pair of electrodes, wherein the layer of an organic light emitting medium comprises: (A) at least one arylamine compound represented by the following formula (V): wherein X 3 represents a substituted or unsubstituted condensed aromatic ring group, the condensed aromatic ring group being derived from naphthalene, phenanthrene, fluoranthene, anthracene, pyrene, perylene, coronene, chrysene, picene, diphenylanthracene, fluorene, triphenylene, rubicene, benzoanthracene, phenylanthracene, bisanthracene, dianthracenylbenzene or dibenzoanthracene, Ar 5 and Ar 6 each independently represent a substituted or unsubstituted monovalent aromatic group having 6 to 40 carbon atoms, and p represents an integer of 1 to 4, provided that X 3 does not represent a fluorene group that is di-substituted at the 9-position, and said arylamine contains no styryl group and no styrylene group; and (B) a compound having condensed rings represented by the following formula (IV-a): wherein A 9 to A 11 each independently represent a substituted or unsubstituted arylene group having 6 to 40 carbon atoms, A 12 to A 14 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, an alkoxyl group having 1 to 6 carbon atoms, an aryloxyl group having 5 to 18 carbon atoms, an aralkyloxyl group having 7 to 18 carbon atoms, an arylamino group having 5 to 16 carbon atoms, a nitro group, a cyano group, an ester group having 1 to 6 carbon atoms or a halogen atom, and at least one of A 9 to A 14 represents a group having condensed aromatic rings, R 21 to R 23 each independently represent hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, an alkoxyl group having 1 to 6 carbon atoms, an aryloxyl group having 5 to 18 carbon atoms, an aralkyloxyl group having 7 to 18 carbon atoms, an arylamino group having 5 to 16 carbon atoms, nitro group, cyano group, an ester group having 1 to 6 carbon atoms or a halogen atom, and at least one of A 9 to A 14 represents a group having condensed aromatic rings having at least 3 rings.