Iridium complex and organic electroluminescence device using the same

An iridium complex represented by the following formula (1) having a naphthalene ring:

• wherein B-C represents a bidentate ligand;
• Ar represent a substituted or unsubstituted fused ring hydrocarbon unit fused onto the naphthalene ring, A ring represents an imidazole, a pyridine, a quinolone and an isoquinoline;
• X is O or S;
• m represents an integer of 1 to 3;
• n represents an integer of 0 to 4;
• and R1 is independently a hydrogen atom, a halogen, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, or a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms.