Patent ID: 7291405

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, wherein the luminescent material is a phosphorescent material that is an iridium complex, a platinum complex, a rhenium complex, a ruthenium complex, a palladium complex or a rhodium complex and the host material is a metal complex containing a metal in groups 4 to 11 of a Periodic Table and the host material is present in the light emitting layer in an amount of 50 to 99.9% by weight; wherein the host material is a compound selected from the group consisting of a compound represented by the formula (II), a compound represented by the formula (III), a compound represented by the formula (IV), a compound represented by the formula (V), and a compound represented by the formula (VI): wherein Q 21 , Q 41 , and Q 61 each independently represent an atomic group necessary to form a nitrogen-containing heterocyclic ring; Z 21 , Z 31 , z 41 , Z 51 , and Z 61 each independently represent a linking group; M 21 , M 31 , M 41 , M 51 , and M 61 each independently represent an ion of a metal in groups 4 to 11 of a Periodic Table; L 21 , L 31 , L 41 , L 51 , and L 61 each independently represent a ligand; R 21 , R 32 , and R 52 each independently represent a hydrogen atom or a substituent; X 41 , X 51 , and X 61 each independently represent a substituted carbon atom or a substituted nitrogen atom; n 21 , n 31 , n 41 , n 51 , and n 61 each independently represent an integer of 0 to 2; m 21 , mm 31 , m 41 , m 51 , and m 61 each independently represent an integer of 1 to 4; and m 22 , m 32 , m 42 , m 52 , and m 62 each independently represent integer of 0 to 6.