ORGANOMETALLIC COMPLEX, LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, ELECTRONIC DEVICE, AND LIGHTING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a novel organometallic complex which can emit phosphorescence in the green to red wavelength region and has high emission efficiency and a high yield of synthesis as a novel substance having a novel skeleton.SOLUTION: The organometallic complex includes a structure represented by general formula (G1) in which a diketone having a 5-membered or 6-membered alicyclic structure composed of carbon and hydrogen is a ligand. (In the formula, L represents a bidentate aromatic ligand and has at least a bond between carbon of an aromatic ring in the aromatic ligand and Ir, X represents a 5-membered or 6-membered alicycle composed of carbon and hydrogen, and Rrepresents 1-4C substituted or unsubstituted alkyl).