Patent ID: 7981522
Filing Date: 2011-07-19
Classification: C08G,C09K,H01L,H05B,Y02E,Y02P,Y10S

Abstract:
1. Organic electroluminescent device comprising anode, cathode and at least one emission layer comprising at least one matrix material A which is doped with at least one phosphorescent emitter, and at least one hole-blocking layer comprising at least one hole-blocking material B, with the proviso that the matrix material A is not identical with the hole-blocking material B, wherein the hole blocking material B conforms to the formulae (1) to (4) according to scheme 1 wherein Y is, identically or differently on each occurrence, C or S in the formula (2) and P in the formulae (1) and (3) and S in the formulae (4); X is on each occurrence, identically or differently, O or S and in formula (3) is S; R R R R Z is a straight-chain, branched or cyclic, preferably conjugated radical having 1 to 40 C atoms, which is preferably conjugated with the two other substituents, where the number of atoms of Z which link the group of the formula (1) and the aromatic radical is preferably an even number, where one or more non-adjacent C atoms may be replaced by —O—, —S— or —NR and with the proviso that the molecular weight of the hole-blocking material B is greater than 150 g/mol.