Patent ID: 8178874

Claim:
A metal complex compound comprising a structure which comprises a metal atom selected from the group consisting of iridium (Ir) atom, rhodium (Rh) atom, and platinum (Pt) atom, a first ring structure and a second ring structure which bonds to the first ring structure via a carbon to carbon single bond, wherein the first ring structure comprises a five-membered or six-membered ring structure constituted by carbon atoms and two nitrogen atoms, one of two nitrogen atoms coordinating to the metal atom, and the other nitrogen atom which does not coordinate to the metal atom is substituted by a group selected from the group consisting of a cyano group, a nitro group, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkylsilyl group having 1 to 20 carbon atoms, a substituted or unsubstituted acyl group having 1 to 20 carbon atoms, and a substituted or unsubstituted aromatic group having 1 to 30 carbon atoms; the carbon atoms constituting the first ring structure other than the carbon atom which bonds to the second ring structure are each optionally substituted by a group selected from the group consisting of a cyano group, a nitro group, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkylsilyl group having 1 to 20 carbon atoms, a substituted or unsubstituted acyl group having 1 to 20 carbon atoms, and a substituted or unsubstituted aromatic group having 1 to 30 carbon atoms; a pair of substituents optionally bond to each other to form a ring structure; and the second ring structure comprises an aromatic ring constituted by only carbon atoms or a combination of carbon atoms and one heteroatom selected from the group consisting of nitrogen, oxygen and sulfur; and when the first ring structure is a five-membered ring which bonds to the second ring structure via the carbon atom between two nitrogen atoms, substituents on two carbon atoms do not bond to each other to form a ring structure, and when the first ring structure is a five-membered ring which bonds to the second ring structure via the carbon atom between two nitrogen atoms, the second ring structure is not substituted with phenyl.