Polymer and organic light emitting device

Patent metadata

Field	Value
Publication number	US-2016218291-A1
Application number	US-201415024986-A
Country	US
Kind code	A1
Filing date	Sep 23, 2014
Priority date	Sep 25, 2013
Publication date	Jul 28, 2016
Grant date	—

Abstract

Polymer and Organic Light Emitting Device A polymer comprising a repeat unit of formula (I a), (I b) or (Ic): (Formulae (Ia), (Ib), (Ic)) wherein M is a metal; R is a backbone repeat group; n is 1 or 2; Sp is a spacer group; w is 0 or 1; L 1 and L 2 are mono- or bidentate co-coordinating groups; ---- represents a second metal to ligand bond in the case where L 1 or L 2 is a bidentate ligand and at least one of L 1 and L 2 is substituted with group of formula (II) (Formula (II)) wherein m is 0 or 1; each Ar 1 , Ar 2 and Ar 3 is aryl or heteroaryl. The polymer may be used as an emissive material in an organic light-emitting device.

First claim

1 . A polymer comprising a repeat unit of formula (Ia), (Ib) or (Ic):

wherein:
M is a metal;
R is a backbone repeat group;
n is 1 or 2;
Sp is a spacer group;
w is 0 or 1;
L 1 is a mono- or bidentate co-coordinating group;
L 2 is a mono- or bidentate coordinating group and is the same or different in each occurrence;
---- represents a second metal to ligand bond in the case where L 1 or L 2 is a bidentate ligand; and
at least one of L 1 and L 2 is substituted with a group of formula (II):

wherein:
m is 0 or 1;
each Ar 1 , Ar 2 , and Ar 3 is independently in each occurrence selected from an aryl or heteroaryl that is unsubstituted or substituted with one or more substituents; and
any two of Ar 1 , Ar 2 and Ar 3 linked to the same N atom are optionally linked by a direct bond or a divalent linking group.

2 . (canceled)

3 . The polymer according to claim 1 , wherein M is Iridium.

4 . The polymer according to claim 1 , wherein:
R is —(Ar 6 ) p —; p is 1, 2, or 3; and each Ar 6 is independently selected from aryl or heteroaryl.

5 . (canceled)

6 . The polymer according to claim 4 , wherein Ar 6 is phenyl that is unsubstituted or substituted with one or more substituents.

7 . The polymer according to claim 6 , wherein R is an unsubstituted or substituted repeat unit of formula:

8 . The polymer according to claim 1 , wherein each L 1 and L 2 are independently selected from ligands comprising a bidentate group of formula (III):

wherein Ar 4 and Ar 5 are the same or different; are optionally fused together; and are independently selected from an aryl or heteroaryl that is unsubstituted or substituted with one or more substituents; and wherein X 1 and Y 1 are the same or different and are independently selected from carbon or nitrogen.

9 . (canceled)

10 . The polymer according to claim 8 , wherein said bidentate group is a 2-phenylpyridine group.

11 . The polymer according to claim 1 , wherein m is 1.

12 . The polymer according to claim 1 , wherein one of Ar 1 , Ar 2 , and Ar 3 is bound directly to L 1 or L 2 .

13 - 17 . (canceled)

18 . The polymer according to claim 1 , wherein w is 0.

19 . (canceled)

20 . The polymer according to claim 1 , wherein Sp is selected from the group consisting of C 1-20 alkyl and phenyl-C 1-20 alkyl, and wherein one or more non adjacent C atoms of C 1-20 alkyl are optionally replaced with O, S, or COO.

21 . The polymer according to claim 1 , comprising a repeat unit of formula (IV) or (V), which is unsubstituted or substituted with one or more substituents:

22 . (canceled)

23 . The polymer according to claim 1 , wherein the polymer contains 0.5-40 mol % of the repeat units of formula (Ia), (Ib), (IV), or (V).

24 . The polymer according to claim 1 , wherein a photoluminescent spectrum of the polymer has a peak at a wavelength in the range 540-620 nm.

25 . (canceled)

26 . The polymer according to claim 1 , comprising one or more co-repeat units.

27 . The polymer according to claim 26 , comprising an arylene co-repeat unit that is unsubstituted or substituted with one or more substituents.

28 - 31 . (canceled)

32 . A formulation comprising:
a polymer according to claim 1 ; and at least one solvent.

33 . 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 .

34 - 35 . (canceled)

36 . The organic light-emitting device according to claim 33 , wherein the device is a white light emitting device.

37 . A method of forming an organic light-emitting device comprising an anode, a cathode, and a light-emitting layer between the anode and the cathode, the method comprising the step of forming the light-emitting layer over one of the anode or cathode, and forming the other of the anode or cathode over the light-emitting layer, wherein the light-emitting layer is formed by depositing the formulation according to claim 32 and evaporating the at least one solvent.

38 - 42 . (canceled)

Assignees

• Cambridge Display Tech Ltd
• Sumitomo Chemical Co
• Sumitomo Chemical Co

Inventors

• Humphries Martin
• Foxon Simon

Classifications

• C08G2261/374

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

• C08G2261/12

  Copolymers · CPC title

• C08G2261/3142

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

• C08G2261/312

  Non-condensed aromatic systems, e.g. benzene · CPC title

• C09K2211/1044

  containing two nitrogen atoms as heteroatoms · CPC title