Organometallic Iridium Complex, Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device

摘要

To provide a long-lifetime organometallic iridium complex exhibiting yellow light emission with high emission efficiency as a novel substance. The organometallic iridium complex includes a ligand in which an unsubstituted phenyl group is bonded to each of the 2-position and the 5-position of pyrimidine. The organometallic iridium complex has a structure represented by General Formula (G1).;

主权项

1. A compound comprising:
a pyrimidine ring; and a first phenyl group and a second phenyl group each bonded to the pyrimidine ring, wherein the first phenyl group is bonded to an iridium atom, wherein the pyrimidine ring is bonded to the iridium atom by a coordinate bond, wherein a dihedral angle between the pyrimidine ring and the second phenyl group is from −20° to −60° in a stable structure of the compound when the compound is in a singlet ground state, and wherein the dihedral angle is from −10° to −50° in a stable structure of the compound when the compound is in a lowest triplet excited state.