Patent ID: 7740956
Filing Date: 2010-06-22
Classification: C09K,H01L,H05B,Y10S

Abstract:
1. An organic electroluminescent device comprising: a pair of electrodes; and at least one organic layer between the pair of electrodes, the at least one organic layer including a luminescent layer, wherein the luminescent layer contains at least one electron injection/transport compound, at least one hole injection/transport compound, and at least one green or blue phosphorescent compound; and the electron injection/transport compound and the hole injection/transport compound each has a minimum triplet exciton energy value which is equal to or more than that of the green or blue phosphorescent compound; wherein the hole injection/transport compound has an ionization potential of from 5.6 eV to 6.1 eV and the electron injection/transport compound has an electron affinity of from 2.0 eV to 3.5 eV; and wherein the electron injection/transport compound, the hole injection/transport compound and the green or blue phosphorescent compound each has a T