Patent ID: 8377575
Filing Date: 2013-02-19
Classification: H01L,Y10S

Abstract:
1. 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 (2); the phosphorescent compound has a lowest triplet energy level of 2.5 eV or more; wherein: each of R A represents a substituted or unsubstituted six to eight-membered aliphatic ring or aromatic ring which may contain a nitrogen atom; provided that adjacent substituents may form a ring; the compound forming the third layer is a compound of the following formula (3) or (4), wherein each of R 1 to R 5 or R 8 to R 11 each represent a hydrogen atom or a substituent, provided that adjacent substituents may form a ring.