Method for manufacturing a light emitting element including a quantum dot composition

Patent metadata

Field	Value
Publication number	US-12258504-B2
Application number	US-202418407326-A
Country	US
Kind code	B2
Filing date	Jan 8, 2024
Priority date	Jun 2, 2020
Publication date	Mar 25, 2025
Grant date	Mar 25, 2025

Abstract

A quantum dot composition includes a quantum dot, and a ligand bonded to a surface of the quantum dot, wherein the ligand includes a head portion bonded to the surface of the quantum dot and containing a polar solvent dissociative functional group, and a tail portion connected to the head portion. A quantum dot composition according to an embodiment is used to form an emission layer of a light emitting element to enhance luminous efficiency of the light emitting element including an emission layer formed through the quantum dot composition.

First claim

What is claimed is:

1. A method of manufacturing a light emitting element, the method comprising:
forming a first electrode;
forming a hole transport region on the first electrode;
providing, on the hole transport region, a quantum dot composition containing a quantum dot composite having a quantum dot and a ligand bonded to a surface of the quantum dot to form a preliminary emission layer;
providing a polar solvent on the preliminary emission layer to form an emission layer, wherein in the providing of the polar solvent on the preliminary emission layer, the ligand is dissociated from the quantum dot in the polar solvent;
forming an electron transport region on the emission layer; and
forming a second electrode on the electron transport region.

2. A method of manufacturing a light emitting element, the method comprising:
forming a first electrode;
forming a hole transport region on the first electrode;
providing, on the hole transport region, a quantum dot composition containing a quantum dot composite having a quantum dot and a ligand bonded to a surface of the quantum dot to form a preliminary emission layer:
providing a polar solvent on the preliminary emission layer to form an emission layer;
forming an electron transport region on the emission layer; and
forming a second electrode on the electron transport region,
wherein the ligand comprises a head portion bonded to the surface of the quantum dot and containing a polar solvent dissociative functional group, and a tail portion connected to the head portion.

3. A method of manufacturing a light emitting element, the method comprising:
forming a first electrode;
forming a hole transport region on the first electrode;
providing, on the hole transport region, a quantum dot composition containing a quantum dot composite having a quantum dot and a ligand bonded to a surface of the quantum dot to form a preliminary emission layer;
providing a polar solvent on the preliminary emission layer to form an emission layer;
forming an electron transport region on the emission layer; and
forming a second electrode on the electron transport region,
wherein the providing of the polar solvent on the preliminary emission layer and the forming of the electron transport region on the emission layer are performed in a single process.

4. The method of claim 3 , wherein the providing of the polar solvent on the preliminary emission layer and the forming of the electron transport region on the emission layer comprise applying, on the light emitting layer, a solution in which an electron transport material is dispersed in the polar solvent.

5. The method of claim 3 , wherein in the providing of the polar solvent on the preliminary emission layer, the ligand is dissociated from the quantum dot in the polar solvent.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Changhee
• Kim Dukki
• Ko Hyojin
• Kim Sehun
• Kim Jaehoon
• Doh Hyunmi
• Jung Yunku
• Ha Jaekook

Classifications

• H10K71/441

  in the presence of solvent vapors, e.g. solvent vapour annealing · CPC title

• H10K71/15

  characterised by the solvent used · CPC title

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H10K50/115

  comprising active inorganic nanostructures, e.g. luminescent quantum dots · CPC title

• H10K85/60

  Organic compounds having low molecular weight (H10K85/10 - H10K85/50 take precedence) · CPC title