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US 2007/0164273 A1Published application
Organic electronic devices
AssigneeMerck Patent GmbH
InventorsAnja Gerhard, Horst Vestweber, Philipp Stossel
Life of this patent
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Abstract
The present invention relates to the improvement of organic electronic devices, in particular fluorescent electroluminescent devices, by using electron-transport materials of the formula (I).
Claims14
Electronic device comprising a cathode, anode and at least one organic layer, wherein the organic layer comprises at least one compound of the formula (1)
- where the following applies to the symbols used:
- X is on each occurrence, identically or differently, O, S, Se, Te or NR;
- R is on each occurrence, identically or differently, an organic radical having 1 to 22 carbon atoms, which may also be bonded to X via an O or N atom, or OH or NH2;
- R1, R2 is on each occurrence, identically or differently, an aromatic or heteroaromatic ring system having 1 to 40 aromatic C atoms, which may be substituted by one or more radicals R3, where the substituents R1 and Rmay form a mono- or polycyclic ring system with one another;
- R3 is on each occurrence, identically or differently, H, OH, N(R4)2, CN, B(R4)2, Si(R4)3, a straight-chain, branched or cyclic alkyl or alkoxy chain having 1 to 22 C atoms, in which, in addition, one or more non-adjacent C atoms may be replaced by —R4C═CR4—, —C≡C—, Si(R4)2, Ge(R4)2, Sn(R4)2, —NR4—, —O—, —S—, —CO—, —CO—O— or —O—CO—O— and where one or more H atoms may be replaced by fluorine, or an aryl, heteroaryl or aryloxy group having 1 to 40 C atoms, which may also be substituted by one or more radicals R4, or a combination of 2, 3 or 4 of these systems;
- two or more substituents R3 here may also form a ring system with one another;
- R4 is on each occurrence, identically or differently, H or an aliphatic or aromatic hydrocarbon radical having 1 to 20 C atoms;
- n is on each occurrence 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10;
- wherein the compound of the formula (1) has a molecular weight of ≧150 g/mol and ≦10,000 g/mol and that the device does not comprise a phosphorescent emitter;
- and
- furthermore wherein neither R1 nor R2 represents a substituted or unsubstituted spirobifluorene,
- characterized in that the absorption edge of the compound of the formula (1) is <400 nm.
9 more elements
Dependencies are inferred from the claim text.