Light emitting polymers and devices

Patent metadata

Field	Value
Publication number	US-9728732-B2
Application number	US-201214237150-A
Country	US
Kind code	B2
Filing date	Aug 3, 2012
Priority date	Aug 5, 2011
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

A polymer comprising units α, β, γ and δ wherein: unit α is present at 30 mole % to 60 mole % and is an optionally substituted arylene; unit β is present at 1 mole % to 30 mole % and is a unit comprising an optionally substituted fluorene; unit γ is present at 1 mole % to 40 mole % and comprises aryl substituted nitrogen, or an optionally substituted triazine; unit δ is present at 0.5 mole % to 15 mole % and comprises an iridium complex; and optionally up to 20 mole % of other units if the total of α, β, γ and δ is less than 100 mole %.

First claim

The invention claimed is:

1. A polymer comprising units α, β, γ and δ wherein:
unit α is present at 30 mole % to 60 mole % and is an optionally substituted arylene;
unit β is present at 1 mole % to 30 mole % and is a unit comprising an optionally substituted fluorene;
unit γ is present at 1 mole % to 40 mole % and comprises aryl substituted nitrogen, or an optionally substituted triazine;
unit δ is present at 0.5 mole % to 15 mole % and comprises an iridium complex;

and optionally up to 20 mole % of other units if the total of α, β, γ and δ is less than 100 mole %.

2. A polymer as claimed in claim 1 wherein the optionally substituted arylene group is an optionally substituted 1,4-phenylene group.

3. A polymer as claimed in claim 1 wherein the unit β is of the formula:

where R 1 and R 2 are independently alkyl, alkenyl, alkaryl, aralkyl, aryl, optionally aryl of up to 20 carbon atoms, or substituted aralkyl where the substituent on the aralkyl or aryl group is one lower alkyl group or two lower alkyl groups optionally linked to form a ring of 4 to 6 carbon atoms;
and where q is 0 or 1 and Q is attached to the fluorene through the nitrogen atom of a group of the formula:

wherein Ar 1 is a phenylene group optionally substituted by one or two lower alkyl or lower alkoxy groups and Ar 2 is a phenyl group optionally substituted by one or two lower alkyl or lower alkoxy groups.

4. A polymer as claimed in claim 1 which comprises more than one type of β unit.

5. A polymer as claimed in claim 1 which comprises at least one type of β unit wherein q is 0 and at least one type of β unit wherein q is 1.

6. A polymer as claimed in claim 1 wherein unit γ is linked into the polymer via each of two arylene groups.

7. A polymer as claimed in claim 1 wherein unit γ comprises triazine substituted with a phenyl group, and wherein the phenyl group is optionally substituted by an alkyl group of 1 to 20 carbon atoms.

8. A polymer as claimed in claim 1 wherein unit δ comprises three phenylpyridyl ligands.

9. A polymer as claimed in claim 1 wherein the iridium complex is a dendrimer comprising at least one dendron.

10. A polymer as claimed in claim 1 wherein unit δ is an arylene repeat unit that the iridium complex is bound to.

11. A polymer as claimed in claim 10 wherein the iridium complex is bound directly to the arylene repeat unit or linked thereto by a chain.

12. A polymer according to claim 1 wherein the polymer comprises up to 10 mole % of other units if the total of α, β, γ and δ is less than 100 mole %.

13. A process for the preparation of a polymer as claimed in claim 1 which comprises the reaction of unit monomers together by Suzuki polymerization.

14. A white light emitting device which comprises a polymer as claimed in claim 1 and a blue electroluminescent material and a red electroluminescent material.

15. A device as claimed in claim 14 in which the polymer, the blue electroluminescent material and the red electroluminescent material are in three different electroluminescent layers.

Assignees

• Humphries Martin
• Bünnagel Torsten
• Cambridge Display Tech Ltd
• Sumitomo Chemical Co

Inventors

• Humphries Martin
• Bünnagel Torsten

Classifications

• H05B33/14

  characterised by the chemical or physical composition or the arrangement of the electroluminescent material {, or by the simultaneous addition of the electroluminescent material in or onto the light source} · CPC title

• H01L51/0038

  Electricity · mapped topic

• H01L51/0085 Primary

  Electricity · mapped topic

• H01L51/0043

  Electricity · mapped topic

• C08G2261/3221

  containing one or more nitrogen atoms as the only heteroatom, e.g. pyrrole, pyridine or triazole · CPC title