Patent ID: 8039121

Claim:
An organic electroluminescent device, comprising: an anode; a cathode; a first layer; a second layer; and a third layer; wherein the first layer, the second layer and the third layer are arranged between the anode and the cathode in order from the anode to the cathode; at least one of the first to third layers comprises a phosphorescent compound; at least one of the first to third layers is an emitting layer; at least three compounds respectively forming the first layer, the second layer, and the third layer other than the phosphorescent compound are compounds of the following formula (3); the compound forming the first layer is a compound of the formula (3) in which at least one of R 1 to R 5 and R 8 to R 11 comprises an aromatic group-substituted amino skeleton; the compound forming the second layer is a compound of the formula (3) in which at least one of R 1 to R 5 and R 8 to R 11 is a substituent having an aromatic skeleton; the compound forming the third layer is a compound of the formula (3) in which at least one of R 1 to R 5 and R 8 to R 11 comprises a nitrogen-containing aromatic five-membered ring, a nitrogen-containing aromatic six-membered ring, or a condensed ring of these rings; wherein: each of R 1 to R 5 and R 8 to R 11 independently represents a hydrogen atom or a substituent; provided that adjacent substituents may form a ring.