Organic light-emitting polymer and device

Patent metadata

Field	Value
Publication number	US-10347840-B2
Application number	US-201615045327-A
Country	US
Kind code	B2
Filing date	Feb 17, 2016
Priority date	Feb 18, 2015
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

A polymer comprising a fluorescent light-emitting repeating unit comprising a group of formula ED-EA wherein ED is an electron-donating unit; EA is an electron-accepting unit; and a band gap EgCT of a charge-transfer state formed from the electron-donating unit and the electron-accepting unit is smaller than the bandgap of either the electron-accepting unit EgEA or that of the electron-donating unit EgED.

First claim

The invention claimed is:

1. A polymer comprising a fluorescent light-emitting repeating unit comprising a group of formula ED-EA; and repeat units of formula EA that are not adjacent to units of formula ED, or repeat units of formula ED that are not adjacent to units of formula EA; wherein ED is an electron-donating unit; EA is an electron-accepting unit; and a band gap Eg CT of a charge-transfer state formed from the electron-donating unit and the electron-accepting unit is smaller than the bandgap of either the electron-accepting unit Eg EA or that of the electron-donating unit Eg ED .

2. A polymer according to claim 1 wherein the light-emitting repeating unit has formula EA-ED-EA.

3. A polymer according to claim 1 wherein ED has a HOMO value of no more than 6 eV from vacuum level.

4. A polymer according to claim 1 wherein ED has formula (V):

wherein Ar 7 , Ar 8 and Ar 9 in each occurrence are independently substituted or unsubstituted aryl or heteroaryl; g is 0 or a positive integer; and each R 13 independently is a substituent.

5. A polymer according to claim 4 wherein R 13 is Ar 10 wherein Ar 10 is a substituted or unsubstituted aryl or heteroaryl group.

6. A polymer according to claim 4 wherein any of Ar 7 , Ar 8 , Ar 9 and Ar 10 bound directly to a N atom in the repeat unit of formula (V) may be linked by a direct bond or a divalent linking atom or group to another of Ar 7 , Ar 8 , Ar 9 and Ar 10 bound directly to the same N atom.

7. A polymer according to claim 1 wherein EA has a LUMO value of at least 2.2 eV from vacuum level.

8. A polymer according to claim 1 wherein EA has formula (I):
—(Ar 1 —Het-Ar 1 )—  (I)

wherein Ar 1 in each occurrence is independently an aryl group, Het is a heteroaryl group containing at least one nitrogen atom and Ar 1 and Het may each independently be unsubstituted or substituted with one or more substituents.

9. A polymer according to claim 1 wherein the light-emitting repeat unit is in the polymer backbone.

10. A polymer according to claim 1 wherein the polymer comprises one or more repeat units for limiting or breaking conjugation along the polymer backbone.

11. A polymer according to claim 1 wherein the polymer further comprises one or more arylene repeat units.

12. A method of forming a polymer according to claim 1 comprising the steps of polymerising a first monomer comprising the electron-donating unit ED and a second monomer comprising the electron-accepting unit EA.

13. A method according to claim 12 wherein one of the first and second monomers is substituted with two leaving groups selected from halogen, sulfonic acid and sulfonic acid esters, and the other of the first and second monomers is substituted with two leaving groups selected from boronic acid and esters thereof.

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

15. A polymer according to claim 1 , wherein a position adjacent to the bond between ED and EA is substituted with a C 1-30 hydrocarbyl group.

16. A polymer according to claim 1 , wherein one of ED and EA comprises a meta-linked phenylene group which is directly bound to the other of ED and EA.

Assignees

• Cambridge Display Tech Ltd
• Sumitomo Chemical Co

Inventors

• Cass Michael
• Roberts Matthew
• Bourcet Florence
• Nikolaenko Andrey

Classifications

• C08G61/12 Primary

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

• C08G2261/3142

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

• C08G2261/522

  fluorescent · CPC title

• H01L51/0043

  Electricity · mapped topic

• H01L51/5016

  Electricity · mapped topic