Organic light emitting polymer comprising light-emitting repeat unit in backbone of polymer and device therewith

Patent metadata

Field	Value
Publication number	US-10870796-B2
Application number	US-201615551423-A
Country	US
Kind code	B2
Filing date	Feb 18, 2016
Priority date	Feb 18, 2015
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

A light-emitting polymer comprising a light-emitting repeat unit in a backbone of the polymer, wherein the polymer has an anisotropy of no more than 0.8 and wherein a transition dipole moment of the light-emitting repeat unit is aligned with the polymer backbone.

First claim

The invention claimed is:

1. A light-emitting polymer comprising a light-emitting repeat unit in a backbone of the polymer, wherein the polymer has an anisotropy factor a of no more than 0.8, a transition dipole moment of the light-emitting repeat unit is aligned with the polymer backbone, and the light-emitting repeat unit is a phosphorescent repeat unit comprising a phosphorescent metal complex;
wherein the light-emitting repeat unit has formula (Va) or (Vb):

wherein M is a metal; Ar 5 is an aromatic group; each X is independently N or CR 14 wherein R 14 independently in each occurrence is H or a substituent and two groups R 14 bound to the same ring may be linked to form a ring; each Y is independently N or CR 15 wherein each R 15 independently is H or a substituent; L 2 is a ligand which is different from

of formula (Va) or

of formula (Vb); and n is 1.

2. The light-emitting polymer according to claim 1 , wherein the polymer has an anisotropy factor a of no more than 0.5.

3. The light-emitting polymer according to claim 1 , wherein the phosphorescent metal complex is an iridium complex.

4. The light-emitting polymer according to claim 1 , wherein the metal of the phosphorescent metal complex is in the polymer backbone.

5. The light-emitting polymer according to claim 1 , wherein the light-emitting repeat unit comprises at least one C,N-cyclometalated ligand.

6. The light-emitting polymer according to claim 1 , wherein a first binding position of the light-emitting repeat unit has a first bond vector and a second binding position of the light-emitting repeat unit has a second bond vector, and wherein the first and second bond vectors are in the same direction along the polymer backbone.

7. The light-emitting polymer according to claim 1 , wherein the polymer comprises one or more co-repeat units of formula (VI):

wherein Ar is an aryl or heteroaryl group that may be unsubstituted or substituted with one or more substituents, and angle θ is 180°±40°.

8. An organic light-emitting device comprising an anode, a cathode and a light-emitting layer between the anode and the cathode wherein the light-emitting layer comprises a polymer according to claim 1 .

9. A method of forming an organic light-emitting device according to claim 8 , the method comprising the step of forming the light-emitting layer by depositing the polymer by a solution deposition method.

10. A light-emitting polymer comprising a phosphorescent light-emitting repeat unit of formula (Va) or (Vb):

wherein M is a metal; Ar 5 is an aromatic group; each X is independently N or CR 14 wherein R 14 independently in each occurrence is H or a substituent and two groups R 14 bound to the same ring may be linked to form a ring; each Y is independently N or CR 15 wherein each R 15 independently is H or a substituent; L 2 is a ligand which is different from

of formula (Va) or

of formula (Vb); and n is 1.

11. The light-emitting polymer according to claim 1 , wherein L 2 is selected from the group consisting of N,N- N,O-, O,O- and N,O-chelating ligands.

12. The light-emitting polymer according to claim 10 , wherein L 2 is selected from the group consisting of N,N- N,O-, O,O- and N,O-chelating ligands.

Assignees

• Cambridge Display Tech Ltd
• Sumitomo Chemical Co

Inventors

• Pegington Ruth
• Cass Michael
• Mohamad David
• Roberts Matthew
• Tarran William
• Humphries Martin

Classifications

• C09K2211/185

  of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd · CPC title

• C09K11/06 Primary

  containing organic luminescent materials · CPC title

• C08G2261/374

  of Os, Ir, Pt, Ru, Rh, Pd · CPC title

• C08G2261/3422

  conjugated, e.g. PPV-type · CPC title

• C08G2261/95

  Use in organic luminescent diodes · CPC title