Polymer and organic light emitting device

Patent metadata

Field	Value
Publication number	US-10032984-B2
Application number	US-201515520937-A
Country	US
Kind code	B2
Filing date	Oct 20, 2015
Priority date	Oct 23, 2014
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

A polymer comprising a repeat unit of formula (I): wherein R 1 in each occurrence is independently H or a substituent; R 2 in each occurrence is independently a substituent; and x is 0, 1, 2 or 3. The polymer may be used as a light-emitting polymer in an organic light-emitting device.

First claim

The invention claimed is:

1. A polymer comprising a repeat unit of formula (I):

wherein R 1 in each occurrence is independently H or a substituent; R 2 in each occurrence is independently a substituent; and x is 0, 1, 2 or 3;
wherein the repeat unit of formula (I) is bound directly to aromatic carbon atoms of adjacent repeat units by carbon-carbon bonds between aromatic carbon atoms of the repeat unit of formula (I) and the aromatic carbon atoms of the adjacent repeat units.

2. A polymer according to claim 1 wherein each R 1 is independently a C 1-40 hydrocarbyl group.

3. A polymer according to claim 1 wherein each x is 0.

4. A polymer according to claim 1 wherein at least one x is at least 1.

5. A polymer according to claim 1 wherein each R 2 is independently a C 1-40 hydrocarbyl group.

6. A polymer according to claim 1 wherein the polymer is a copolymer comprising one or more co-repeat units.

7. A formulation comprising a polymer according to claim 1 and at least one solvent.

8. An organic light-emitting device comprising an anode, a cathode and a semiconducting region between the anode and the cathode wherein the semiconducting region comprises a polymer comprising a repeat unit of formula (I):

wherein R 1 in each occurrence is independently H or a substituent; R 2 in each occurrence is independently a substituent; and x is 0, 1, 2 or 3;
wherein the repeat unit of formula (I) is bound directly to aromatic carbon atoms of adjacent repeat units by carbon-carbon bonds between aromatic carbon atoms of the repeat unit of formula (I) and the aromatic carbon atoms of the adjacent repeat units.

9. An organic light-emitting device according to claim 8 wherein the semiconducting region comprises a light-emitting layer comprising the polymer.

10. An organic light-emitting device according to claim 8 wherein the semiconducting region comprises a light-emitting layer and a charge-transporting layer, the charge-transporting layer comprising the polymer.

11. An organic light-emitting device according to claim 8 wherein the device emits white light.

12. A method of forming a device according to claim 8 , the method comprising the steps of depositing a formulation comprising a polymer comprising a repeat unit of formula (I):

wherein R 1 in each occurrence is independently H or a substituent; R 2 in each occurrence is independently a substituent; x is 0, 1, 2 or 3; and at least one solvent and evaporating the at least one solvent.

13. A method for a use of a repeat unit of formula (I) to enhance the solubility of a polymer:

wherein R 1 in each occurrence is independently H or a substituent; R 2 in each occurrence is independently a substituent; and x is 0, 1, 2 or 3;
wherein the repeat unit of formula (I) is bound directly to aromatic carbon atoms of adjacent repeat units by carbon-carbon bonds between aromatic carbon atoms of the repeat unit of formula (I) and the aromatic carbon atoms of the adjacent repeat units.

Assignees

• Cambridge Display Tech Ltd
• Sumitomo Chemical Co

Inventors

• Pillow Jonathan
• Humphries Martin

Classifications

• C08G2261/124

  alternating · CPC title

• C08G2261/95

  Use in organic luminescent diodes · CPC title

• C08G2261/5222

  electrofluorescent · CPC title

• C08G61/10 Primary

  only aromatic carbon atoms, e.g. polyphenylenes · CPC title

• C08G2261/3142

  fluorene-based, e.g. fluorene, indenofluorene, or spirobifluorene · CPC title