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US 8,044,217 B2Granted
White-emitting copolymers, representation, and use thereof
AssigneeMerck Patent GmbH
InventorsAurelie Falcou, Arne Büsing, Susanne Heun, Jürgen Steiger, Anja Gerhard, Niels Schulte, Heinrich Becker
Life of this patent
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Abstract
The present invention relates to white-emitting copolymers which are obtained by a combination of blue-, green- and red-emitting repeating units. The copolymers of the invention display better film formation and an improved efficiency when used in polymeric organic light-emitting diodes compared to materials according to the prior art.
Claims10
A monomer of the formula (XI)
- wherein Y is identical or different on each occurrence and is in each case S or O;
- Ar is identical or different on each occurrence and is in each case phenylene and may be unsubstituted or substituted by fluorine or by one or more radicals R, OR or NR2;
- R is identical or different on each occurrence and is in each case H, a linear, branched or cyclic alkyl chain which has from 1 to 22 carbon atoms and in which one or more nonadjacent carbon atoms is optionally replaced by O, S, —CO—O— or —O—CO—O—, where one or more H atoms may also be replaced by fluorine, or a substituted or unsubstituted aryl group which has from 5 to 40 carbon atoms and in which one or more carbon atoms is optionally replaced by O, S or N, and
- the broken-line bonds indicate the linkage in the polymer.
1 more element
A monomer of the formula (XI)
- wherein Y is identical or different on each occurrence and is in each case S or O;
- Ar is identical or different on each occurrence and is in each case an aromatic-ring system which has from 3 to 30 carbon atoms—and may be unsubstituted or substituted by fluorine or by one or more radicals R, OR or NR2;
- R is identical or different on each occurrence and is in each case H, a linear, branched or cyclic alkyl chain which has from 1 to 22 carbon atoms and in which one or more nonadjacent carbon atoms is optionally replaced by O, S, —CO—O— or —O—CO—O—, where one or more H atoms may also be replaced by fluorine, or a substituted or unsubstituted aryl group which has from 5 to 40 carbon atoms and in which one or more carbon atoms is optionally replaced by O, S or N, and
- the broken-line bonds indicate the linkage in the polymer.
1 more element
Dependencies are inferred from the claim text.