Patent ID: 7279233

Claim:
A light-emitting device comprising a light-emitting layer containing a light-emitting material between a pair of electrodes, said light-emitting material comprising a metal coordination compound having a partial structure represented by a following general formula (1): (wherein: Cu represents a copper ion; a ligand A is represented by a following structural formula: (wherein: R and R′ each represent one of a straight-chain, branched, or cyclic alkyl group and an aromatic cyclic group that may have a substituent, and R and R′ may be identical to or different from each other; a CH 2 group in the alkyl group may be substituted by one of —O— and —NH—; an H atom may be substituted by one of an aromatic cyclic group and a halogen atom; and one of R and R′ may be a hydrogen atom); an atom P that coordinates with Cu is a phosphorus atom of a phosphine compound represented by PR 1 R 2 R 3 (R 1, R 2, and R 3 in PR 1 R 2 R 3 each represent one of a straight-chain, branched, or cyclic alkyl group and an aromatic cyclic group that may have a substituent, and R 1, R 2, and R 3 may be identical to or different from one another, a CH 2 group in the alkyl group may be substituted by one of —O— and —NH—, a H atom may be substituted by one of an aromatic cyclic group and a halogen atom; an atom of X 1 that coordinates with Cu is selected from the group consisting of a halogen atom, an oxygen atom, a sulfur atom, and a nitrogen atom; and one of R 1, R 2, and R 3 in PR 1 R 2 R 3 may contain X 1 to form a bidentate ligand).