Patent ID: 8119257

Claim:
An organic electroluminescent device comprising an anode, organic layers containing a hole-transporting layer, a light-emitting layer, and an electron-transporting layer, and a cathode piled one upon another on a substrate with the hole-transporting layer disposed between the light-emitting layer and the anode and the electron-transporting layer disposed between the light-emitting layer and the cathode wherein the light-emitting layer comprises an organic metal complex represented by the following general formula (I) as a host material and an organic metal complex represented by general formula (II) as a guest material: in general formula (I), each of R 1 to R 6 is independently a hydrogen atom, an C1-C6 alkyl group, an C1-C6 alkoxy group and L is a monovalent group represented by the following general formula (1) or (4) wherein each of Ar 1 is a substituted or unsubstituted phenyl group or a substituted or unsubstituted naphthyl group, wherein when Ar 1 is substituted, the substituent is independently a C1-C6 alkyl group, a phenyl group, a naphthyl group, or a phenyl group substituted at the 3- and 5-positions with methyl groups, and R 1 to R 6 are as defined above; in general formula (II), wherein, each of R 7 to R 14 is independently a hydrogen atom, an C1-C6 alkyl group, an aralkyl group, an C1-C6 alkoxy group, or phenyl group.