Polymers for electroluminescent devices
OwnerAndrew B. Holmes, Richard H. Friend +6inventors
InventorsAndrew B. Holmes, Richard H. Friend, Stephen C. Moratti, Derek R. Baigent, Donald C. Bradley, Raoul Cervini, Neil C. Greenham, Peter J. Hamer
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Abstract
This invention provides semiconductive conjugated polymers incorporating electron-withdrawing groups for use in electroluminescent devices, methods for their manufacture, and electroluminescent devices incorporating the polymers. The electron-withdrawing group is conjugatively linked to the polymer chain and is selected so that the polymer exhibits electroluminesence upon application of an electric field to a layer thereof.
Claims39
A semiconductive conjugated polymer comprising arylene vinylene units forming at least part of the polymer main chain in which a solubilising group is present on at least some of the arylene moieties so as to render the polymer solution processible, and an electron-withdrawing group is conjugatively linked to the polymer main chain, wherein the solubilising group and the electron-withdrawing group are selected so that the polymer exhibits electroluminescence upon application of an electric field to a layer thereof.
A semiconductive conjugated polymer, having the general formula:
- Ar--CX.dbd.CH--Ar'--CH.dbd.CX!.sub.n
- wherein Ar and Ar' are the same or different and represent arylene groups, each vinylene is substituted with an electron withdrawing group X, n represents the degree of polymerisation and a solubilising group is present on at least some of the arylene groups so as to render the polymer solution processible;
- and wherein the polymer exhibits electroluminscence upon application of an electric field to a layer thereof.
A semiconductive conjugated polymer comprising:
- (i) conjugated regions incorporating arylene vinylene units forming part of the polymer main chain in which a solubilising group is present on at least some of the arylene moieties so as to render the polymer solution processible, and an electron-withdrawing group is conjugatively linked to the polymer main chain;
- and
- (ii) unconjugated regions, wherein the solubilising group and the electron-withdrawing group are selected so that the polymer exhibits electroluminescence upon application of an electric field to a layer thereof.
An electroluminescent device comprising a semiconductive layer which comprises an emissive layer of semiconductive conjugated polymer, a first contact layer in contact with a first surface of the semiconductive layer, and a second contact layer in contact with a second surface of the semiconductor layer, wherein the polymer comprises arylene vinylene units forming at least part of the polymer main chain, on which is present a solubilising group so as to render the polymer solution processible, and an electron-withdrawing group is conJugatively linked to the polymer main chain, wherein the solubilising group and the electron-withdrawing group are selected so that the polymer emits radiation upon application of an electric field between the first and second contact layers.
Dependencies are inferred from the claim text.