Organic electroluminescent device

1. An organic electroluminescent device comprising:

a pair of electrodes; and

at least one organic compound layer including a light emitting layer between the pair of electrodes,

wherein the light emitting layer contains a host material and a light emitting material, and

wherein the host material contains a metal complex having a quadridentate ligand, which is a compound represented by Formula (2):

wherein M 21 represents a metal ion;

Q 23 and Q 24 each independently represents an atom group coordinating with M 21 ;

L 22 represents a connection group selected from a dialkyl methylene group, a diaryl methylene group or a diheteroaryl methylene group,

R 21 and R 22 each independently represents a substituent group;

m 21 and m 22 each independently represents an integer from 0 to 3;

M 21 -N bond (dotted line) represents a coordinate bond; and

M 21 -Q 23 bond and M 21 -Q 24 bond each may be a covalent bond, a coordinate bond or an ion bond.

2. The organic electroluminescent device according to claim 1 , wherein M 21 represents a metal ion selected from a rhodium ion, a palladium ion, a rhenium ion, an iridium ion and a platinum ion.

3. The organic electroluminescent device according to claim 1 ,

wherein the light emitting material is a phosphorescent material.

4. The organic electroluminescent device according to claim 1 ,

wherein a concentration of the host material in the light emitting layer is in a range of from 50 mass % to 99.9 mass %.

5. The organic electroluminescent device according to claim 1 ,

wherein a concentration of the metal complex having a quadridentate ligand in the light emitting layer is in a range of from 50 mass % to 99.9 mass %.

6. The organic electroluminescent device according to claim 1 , wherein the metal ion represented by M 21 in Formula (2) is one of a platinum ion and a palladium ion.

7. The organic electroluminescent device according to claim 1 , wherein a T 1 level (an energy level of the least triplet excited state) of the light emitting material is in a range of 65 Kcal/mol (272.35 KJ/mol) to 80 Kcal/mol (335.2 KJ/mol).

8. The organic electroluminescent device according to claim 1 , wherein Q 23 and Q 24 are selected from the group consisting of an atom group coordinating with a carbon atom, an atom group coordinating with a nitrogen atom, and an atom group coordinating with an oxygen atom.

9. The organic electroluminescent device according to claim 1 , wherein Q 23 and Q 24 are selected from the group consisting of an aryl group coordinating with a carbon atom, a heteroaryl group coordinating with a carbon atom, a heteroaryl group coordinating with a nitrogen atom, and a carboxyl group coordinating with an oxygen atom.