Organic metal complex and its use in organic electroluminescent device

An organic electroluminescent device containing an organic layer comprising an organic metal complex represented by the following general formula (I) for use in an organic EL device:

• in general formula (I), Ar1 denotes a divalent aromatic hydrocarbon group or a divalent heteroaromatic group and may have substituents;
• Ar2 and Ar3 respectively denote an aromatic hydrocarbon group or a heteroaromatic group and may have substituents and Ar2 and Ar3 never link together to form a ring;
• M denotes a trivalent metal;
• and L is a ligand represented by the following general formula (III):
• in general formula (III), the groups R1 to R8 respectively denote a hydrogen atom or an arbitrary substituent, substituents located adjacently may link together to form a ring, and X denotes an oxygen or sulfur atom,
• wherein the organic layer comprising the organic metal complex is a light emitting layer, wherein the organic metal complex is a host material and wherein the host material is doped with a phosphorescent dopant,
• wherein the aromatic hydrocarbon group of Ar2 and Ar3 is each independently at least one selected from the group consisting of phenyl, naphthyl, acenaphthyl, and anthryl groups, and wherein the heteroaromatic group of Ar2 and Ar3 is each independently at least one selected from the group consisting of pyridyl, quinolyl, thienyl, carbozolyl, indolyl, and furyl groups, wherein the aromatic hydrocarbon group and the heteroaromatic group may be substituted with at least one unsubstituted substituent selected from the group consisting of lower alkyl group of 1 to 6 carbon atoms, lower alkoxy group of 1 to 6 carbon atoms, phenoxy group, methylphenyloxy group, benzyloxy group, phenyl group, naphthyl group, and dimethylamino group.