Organic electroluminescent devices and metal complex compounds

1. 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.

2. The organic electroluminescent device as claimed in claim 1 , wherein said metal complex is incorporated in the luminescent layer.

3. The organic electroluminescent device as claimed in claim 1 , wherein the organic layer comprises at least one luminescent layer and a hole transporting layer, and the organic layer further comprises at least one layer selected from the group consisting of an exciton-blocking layer, a hole injection layer, a hole-blocking layer and an electron-transporting layer.

4. The organic electroluminescent device as claimed in claim 1 , wherein the organic layer comprises at least one luminescent layer, and a host material of the luminescent layer is selected from the group consisting of an amine compound, a metal chelate oxynoid compound in which the metal is aluminum, zinc or transition metals, a polyarylene compound, a condensed aromatic carbocyclic compound, and a non-complex aromatic heterocyclic compound.

5. The organic electroluminescent device as claimed in claim 1 , wherein the organic layer comprises at least one electron-transporting layer in which an electron-transporting material is selected from the group consisting of a metal chelate oxynoid compound, a polyarylene compound, a condensed aromatic carbocyclic compound and a non-complex aromatic heterocyclic compound.

6. The organic electroluminescent device as claimed in claim 1 , wherein the organic layer comprises at least one luminescent layer, and a host material of the luminescent layer is composed of at least two compounds.