Patent ID: 7211336

Claim:
An organic electroluminescent device comprising: a pair of electrodes; and at least one organic compound layer between the pair of electrodes, the at least one organic compound layer including a light emitting layer, wherein the light emitting layer contains at least one host material and at least one luminescent material that is a phosphorescent compound that emits light via a triplet excited state, and at least one host material is a compound represented by formula (V): wherein X 51 represents a substituted nitrogen atom; X 52 represents a carbon atom that is present in a carbonylene group, an alkylene group or a group connected to X 51 to form a nitrogen containing-heterocyclic group; M 51 represents a metal ion; L 51 represents a ligand; m 51 represents an integer of 1 to 4; m 52 represents an integer of 0 to 6; and Q 51 represents a group necessary to form a nitrogen-containing heterocyclic ring.