CROSSLINKED EMISSIVE LAYER CONTAINING QUANTUM DOTS FOR LIGHT-EMITTING DEVICE AND METHOD FOR MAKING SAME

• US 20200136076A1
• Filed: 12/23/2019
• Published: 04/30/2020
• Est. Priority Date: 03/27/2018
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Angioni, Enrico, Palles-Dimmock, James Andrew Robert, Boardman, Edward Andrew, Smeeton, Tim Michael
• Granted Patent: US 10,991,900 B2
• Time in Patent Office: Days
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: H01L 33/06 within the light emitting region, e.g. quantum confinement structure or tunnel barrier
• CPC Class Codes: H10K 50/115 comprising active inorganic nanostructures, e.g. luminescent quantum dots
• CPC Class Codes: H10K 50/15 Hole transporting layers
• CPC Class Codes: H10K 50/16 Electron transporting layers
• CPC Class Codes: H10K 50/171 Electron injection layers
• CPC Class Codes: H10K 50/18 Carrier blocking layers
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 50/828 Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 85/111 comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene

Abstract

A light-emitting device includes an anode; a cathode; and an emissive layer disposed between the anode and the cathode, the emissive layer including quantum dots dispersed in a crosslinked matrix formed from one or more crosslinkable charge transport materials. A method of forming the emissive layer of a light-emitting device includes depositing a mixture including quantum dots and one or more crosslinkable charge transport materials on a layer; and subjecting at least a portion of the mixture to UV activation to form an emissive layer including quantum dots dispersed in a crosslinked matrix.

Claims

1. A method of forming an emissive layer of a light-emitting device, comprising:

depositing a mixture comprising quantum dots and one or more crosslinkable materials on a layer; and

subjecting at least a portion of the mixture to UV activation to form an emissive layer comprising quantum dots and a crosslinked matrix.

2. The method of claim 1, wherein the quantum dots are dispersed in the crosslinked matrix.

3. The method of claim 1, wherein the quantum dots form part of the crosslinked matrix.

4. The method of claim 1, wherein the quantum dots comprise ligands at their outer surface.

5. The method of claim 1, wherein the mixture further comprises a photo initiator.

6. The method of claim 1, wherein at least one of the one or more crosslinkable materials is a hole transporting materials.

7. The method of claim 1, wherein at least one of the one or more crosslinkable materials is an electron transporting materials.

8. The method of claim 1, wherein the layer is an electrode.

9. The method of claim 1, wherein the layer is a hole transport layer.

10. The method of claim 9, wherein the hole transport layer comprises a crosslinkable hole transport material, and the UV activation crosslinks the hole transport layer with the matrix of emissive layer.

11. The method of claim 1, wherein the layer is an electron transport layer.

12. The method of claim 11, wherein the electron transport layer comprises a crosslinkable electron transport material, and the UV activation crosslinks the electron transport layer with the matrix of emissive layer.