Patent ID: 7862904
Filing Date: 2011-01-04
Classification: C07C,H01L,Y02E,Y10S

Abstract:
1. An organic electroluminescent device comprising an anode, a cathode and at least one emission layer comprising at least one matrix material which is doped with at least one phosphorescent emitter, wherein at least one hole blocking layer is incorporated between the emission layer and the cathode and comprises at least one compound of the formula wherein Aryl is the same or different at each instance and is composed of phenyl groups, contains from 5 to 18 carbon atoms and may be substituted with one or more radicals R; R is the same or different at each instance and is H, F, CN, N(R R n is the same or different at each instance and is 1, 2, 3 or 4; m is the same or different at each instance and is 0, 1, 2, 3 or 4; o is the same or different at each instance and is 0, 1, 2 or 3; p is the same or different at each instance and is 0, 1, 2, 3 or 4; with the proviso that the sum of n+o=4 and the sum of m+p=4, and with the further proviso that the hole blocking material is not identical to the matrix material, and with the further proviso that aryl does not contain any diazine, triazine or tetrazine group.