Patent ID: 9444064
Filing Date: 2016-09-13
CPC Classification: H01L

Claim Text:
1. An organic electroluminescent device comprising an anode, a cathode and at least one emitting layer which comprises at least one phosphorescent compound which is doped into a mixture of two materials A and B, where materials A and B are defined low-molecular-weight compounds having a molecular weight of 2000 g/mol or less, wherein material A is a charge-transporting material and is an electron-conducting compound which is selected from the group consisting of aromatic ketones, aromatic phosphine oxides, aromatic sulfoxides, aromatic sulfones, triazine derivatives, zinc complexes and aluminum complexes, and in that material B which is not involved in charge transport, has a HOMO of −5.4 eV or less and a LUMO of −2.4 eV or more and which has an energy gap of at least 3.5 eV and wherein the material B is a compound of the formula (23), (24) or (25): wherein Ar is on each occurrence, identically or differently, an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which optionally in each case be substituted by one or more groups R R Ar R n is, identically or differently on each occurrence, 0 or 1, R R