Organic light emitting composition, device and method

Patent metadata

Field	Value
Publication number	US-9493613-B2
Application number	US-201214130922-A
Country	US
Kind code	B2
Filing date	Jul 3, 2012
Priority date	Jul 4, 2011
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

Disclosed is a crosslinkable light-emitting composition comprising at least one host material, at least one phosphorescent light-emitting dopant, a first crosslinker comprising an unsaturated carbon-carbon bond group and a second crosslinker comprising a ring system capable of undergoing ring-opening crosslinking.

First claim

The invention claimed is:

1. A crosslinkable light-emitting composition comprising at least one host material, at least one phosphorescent light-emitting dopant, a first crosslinker comprising an unsaturated carbon-carbon bond group and a second crosslinker comprising a ring system capable of undergoing ring-opening crosslinking, wherein the first crosslinker and the second crosslinker are repeat units of a crosslinkable polymer and wherein the crosslinkable polymer is the only crosslinkable polymer of the composition.

2. A crosslinkable light-emitting composition according to claim 1 wherein the at least one phosphorescent light-emitting dopant is blended with the at least one host material.

3. A crosslinkable light-emitting composition according to claim 1 wherein the at least one phosphorescent light-emitting dopant is bound to the at least one host material.

4. A crosslinkable light-emitting composition according to claim 1 wherein the first crosslinker comprises a carbon-carbon double bond.

5. A crosslinkable light-emitting composition according to claim 1 wherein the ring system comprises cyclobutane.

6. A crosslinkable light-emitting composition according to claim 1 wherein the ring system comprises an optionally substituted polycyclic ring system.

7. A crosslinkable light-emitting composition according to claim 6 wherein the polycyclic ring system comprises an optionally substituted benzocyclobutane group.

8. A crosslinkable light-emitting composition according to claim 1 wherein the at least one host material is a polymer.

9. A crosslinkable light-emitting composition according to claim 8 wherein the phosphorescent light-emitting dopant is a repeat unit in the host material polymer main chain, a side group of the host material polymer or an end-group of the host material polymer.

10. A crosslinkable light-emitting composition according to claim 1 wherein the second crosslinker is capable of forming a diene, the diene being capable of reacting with the unsaturated carbon-carbon bond group of the first crosslinker.

11. A formulation comprising a crosslinkable light-emitting composition according to claim 1 and at least one solvent.

12. A method of forming an organic light-emitting device comprising the steps of:
forming a first organic light-emitting layer by depositing a crosslinkable light-emitting composition according to claim 1 over a first electrode for injection of charge carriers of a first type and crosslinking the crosslinkable groups; and
forming a second electrode for injection of charge carriers of a second type over the first organic light-emitting layer.

13. A method according to claim 12 wherein the crosslinkable light-emitting composition further comprises at least one solvent.

14. A method according to claim 12 wherein an organic layer is deposited onto the first organic light-emitting layer from a solution in a solvent.

15. A method according to claim 14 wherein the organic layer is selected from a second light-emitting layer; a charge transporting layer; a charge blocking layer; and an exciton blocking layer.

16. An organic light-emitting device comprising a crosslinked light-emitting layer formed from a crosslinkable light-emitting composition according to claim 1 .

17. An organic light-emitting device according to claim 16 which is a white organic light-emitting device.

18. An organic light-emitting device according to claim 16 comprising at least one further light-emitting layer in addition to the crosslinked light-emitting layer.

19. A crosslinkable light-emitting composition according to claim 4 wherein the carbon-carbon double bond is a terminal double bond.

Assignees

• Humphries Martin
• Wilson Richard J
• Cambridge Display Tech Ltd
• Sumitomo Chemical Co

Inventors

• Humphries Martin
• Wilson Richard J

Classifications

• H10K85/151

  Copolymers · CPC title

• C08G61/12 Primary

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

• H01L51/5044

  Electricity · mapped topic

• H01L51/0085

  Electricity · mapped topic

• H01L51/5004

  Electricity · mapped topic