Organic light-emitting compositions having multiple triplet-accepting materials, and devices and methods thereof

Patent metadata

Field	Value
Publication number	US-10205114-B2
Application number	US-201515507470-A
Country	US
Kind code	B2
Filing date	Aug 28, 2015
Priority date	Aug 28, 2014
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

A composition suitable for use in an organic light-emitting layer (103) of an organic light-emitting device having an anode (101) and a cathode (105), the composition comprising a fluorescent light-emitting material, a first triplet-accepting material and a second triplet-accepting material that is different from the first triplet-accepting material. The fluorescent light-emitting material may be a repeat unit of a light-emitting polymer, and the first and second triplet-accepting materials may independently be repeat units of the light-emitting polymer or may be mixed with the fluorescent light-emitting material.

First claim

The invention claimed is:

1. A composition comprising a light-emitting polymer having a backbone, a first triplet-accepting material covalently bound to the light-emitting polymer, and a second triplet-accepting material that is different from the first triplet-accepting material and that is mixed with the light-emitting polymer.

2. A composition according to claim 1 , wherein light-emitting material is provided as a repeat unit in the backbone; as a side-group pendant from the backbone; or as an end-group of the polymer.

3. A composition according to claim 2 wherein the light-emitting material is provided as a repeat unit of formula (IX) in the polymer backbone:

wherein Ar 8 and Ar 9 in each occurrence are independently substituted or unsubstituted aryl or heteroaryl, g is greater than or equal to 1, R 13 is H or a substituent, and c and d are each independently 1, 2 or 3; and any two of Ar 8 , Ar 9 and R 13 directly bound to the same N atom may be linked by a direct bond or a divalent linking group to form a ring.

4. A composition according to claim 1 , wherein the first triplet accepting material is a repeat unit in the backbone; a side-group pendant from the backbone; or an end-group of the polymer.

5. A composition according to claim 4 wherein the first triplet-accepting material is provided as a repeat unit of formula (I) in the polymer backbone:

wherein Ar is an aryl or heteroaryl group that may be unsubstituted or substituted with one or more substituents; R 1 is H or a substituent; R in each occurrence is independently a substituent; and n in each occurrence is independently 0 or a positive integer.

6. A composition according to claim 5 wherein Ar is phenyl that may be unsubstituted or substituted with one or more substituents.

7. A composition according to claim 5 wherein R 1 is H.

8. A composition according to claim 1 , wherein the second triplet-accepting material is provided as a backbone repeat unit, side group or end group of a triplet-accepting polymer.

9. A composition according to claim 8 wherein the second triplet-accepting material is a polycyclic aromatic repeat unit of the triplet-accepting polymer.

10. A composition according to claim 9 wherein the polycyclic aromatic co-repeat unit is selected from anthracene and pyrene, each of which may be unsubstituted or substituted with one or more substituents.

11. A composition according to claim 10 wherein the second triplet-accepting material is provided as a repeat unit of formula (II) or (III):

wherein R 4 in each occurrence is independently a substituent; each a is independently 0, 1 or 2; each b is independently 0, 1 or 2; and each c is 0, 1, 2, 3 or 4.

12. 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 composition comprising a light-emitting polymer having a backbone, a first triplet-accepting material covalently bound to the light-emitting polymer, and a second triplet-accepting material that is different from the first triplet-accepting material and that is mixed with the light-emitting polymer.

13. A method of forming an organic light-emitting device according to claim 12 , the method comprising the steps of forming the light-emitting layer over one of the anode and cathode, and forming the other of the anode and cathode over the light-emitting layer.

14. A method according to claim 13 wherein the light-emitting layer is formed by depositing formulation comprising a composition comprising a light-emitting material, a first triplet-accepting material, a second triplet-accepting material that is different from the first triplet-accepting material and at least one solvent over the one of the anode and cathode and evaporating the at least one solvent.

Assignees

• Cambridge Display Tech Ltd
• Sumitomo Chemical Co

Inventors

• Pintani Martina
• Johnson Ian
• Di Stasio Francesco
• Humphries Martin
• Pillow Jonathan
• Pegington Ruth
• Morey James

Classifications

• C08G2261/122

  statistical · CPC title

• C08G2261/411

  Suzuki reactions · CPC title

• C08G2261/5242

  electrophosphorescent · CPC title

• C08G2261/3162

  Arylamines · CPC title

• C08G61/12 Primary

  Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule · CPC title