Patent ID: 8003227

Claim:
Organic electroluminescent device comprising an anode, a cathode and an emission layer, consisting of at least one matrix material which is doped with at least one phosphorescent emitter, characterised in that a hole-blocking layer which comprises a compound of the formula (1) where the following applies to the symbols and indices used: Q is on each occurrence, identically or differently, N or CR, with the proviso that at least two and a maximum of four Q stand for nitrogen; R is on each occurrence, identically or differently, H, NO 2 , CN, N(R 1 ) 2 , a straight-chain, branched or cyclic alkyl or alkoxy group having 1 to 40 C atoms, in which one or more non-adjacent CH 2 groups may be replaced by —R 1 C═CR 1 —, —C≡C—, Si(R 1 ) 2 , Ge(R 1 ) 2 , Sn(R 1 ) 2 , —O—, —S— or —NR 1 — and in which one or more H atoms may be replaced by F or an aromatic group R 1 , or an aromatic or heteroaromatic ring system or an aryloxy or heteroaryloxy group, each having 1 to 40 aromatic C atoms, in which one or more H atoms may be replaced by F, Cl, Br or I or which may be substituted by one or more non-aromatic radicals R; a plurality of substituents R here may define a further mono- or polycyclic, aliphatic or aromatic ring system, or an aromatic or heteroaromatic ring system bonded via a divalent group —Z— or an aryloxy or heteroaryloxy group, each having 1 to 40 aromatic C atoms, in which one or more H atoms may be replaced by F, Cl, Br or I or which may be substituted by one or more non-aromatic radicals R; a plurality of substituents R here may define a further mono- or polycyclic, aliphatic or aromatic ring system; R 1 is on each occurrence, identically or differently, H or an aliphatic, aromatic or heteroaromatic hydrocarbon radical having 1 to 20 C atoms, in which a plurality of substituents R 1 or R 1 with R may also define a further mono- or polycyclic, aliphatic or aromatic ring system; Z is on each occurrence, identically or differently, a straight-chain, branched or cyclic, conjugated radical having 1 to 40 C atoms, which is optionally in conjugation with the two other substituents, where the number of atoms in Z which link the group of the formula (1) and the aromatic radical is an even number, where one or more non-adjacent C atoms may be replaced by —O—, —S— or —NR 1 — or one or more C atoms may be substituted by a radical R 1 or halogen; wherein in compounds of the formula (1), a 9,9′-spirobifluorene derivative, a 6,6- and/or 12,12-di- or tetrasubstituted indenofluorene derivative, a tetraarylmethane derivative or a triptycene derivative is present in at least one of the radicals R, wherein the structure of the formula (1) is pyridazine, pyrazine, or 1,3,5-triazine, with the proviso that R does not contain substituted or unsubstituted phenylpyridine, is incorporated between the emission layer and the cathode.