Patent ID: 8211553

Claim:
An organic electroluminescent device, comprising a pair of electrodes and at least one organic layer including a luminescent layer between the pair of electrodes, wherein at least one layer between the pair of electrodes comprises at least one metal complex having a tetradentate-chain structure ligand; wherein the metal complex is a compound represented by formula (9): wherein, M A1 represents a platinum ion; Q A1 and Q A2 each represent an atomic group necessary to form a nitrogen-containing heterocycle selected from the group consisting of a pyridine ring, a pyrazine ring, a pyrimidine ring, a pyridazine ring, a triazine ring, a pyrazole ring, an imidazole ring, an oxazole ring, a pyrrole ring, a benzazole ring, a condensed ring containing any of these rings, and tautomers thereof; R A1 and R A2 represent groups that together form a benzene ring or a pyridine ring; R A3 and R A4 represent groups that together form a benzene ring or a pyridine ring; Y A2 and Y A3 each represent a single bond; Y A1 represents a linking group that connects Q A1 and Q A2 with one carbon atom or one nitrogen atom; L A5 represents a ligand to coordinate to M A1 ; n A1 represents an integer of 0.