Light emitting device, method for manufacturing the same, and electronic device including the same

Patent metadata

Field	Value
Publication number	US-12433089-B2
Application number	US-202117515784-A
Country	US
Kind code	B2
Filing date	Nov 1, 2021
Priority date	Nov 9, 2020
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

A method of manufacturing a light emitting device that includes providing a first electrode, forming a light emitting layer including quantum dots on the first electrode, forming an electron auxiliary layer on the light emitting layer, and forming a second electrode on the electronic auxiliary layer. The forming of the electron auxiliary layer includes forming an electron auxiliary layer including a plurality of metal oxide nanoparticles, and contacting the plurality of metal oxide nanoparticles with a base including a hydroxyl group (OH).

First claim

What is claimed is:

1. A method of manufacturing a light emitting device, comprising
providing a first electrode,
forming a light emitting layer comprising quantum dots on the first electrode,
forming an electron auxiliary layer on the light emitting layer, wherein the electron auxiliary layer comprises a plurality of metal oxide nanoparticles, and
contacting the electron auxiliary layer, which includes the plurality of metal oxide nanoparticles, with a base comprising a hydroxyl group to provide a plurality of base-treated metal oxide nanoparticles, and
forming a second electrode on the base contacted electron auxiliary layer,
wherein the base comprising the hydroxyl group comprises cesium hydroxide, an alkylammonium hydroxide, or a combination thereof.

2. The method of claim 1 , wherein the alkylammonium hydroxide comprises tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetra propylammonium hydroxide, tetrabutylammonium hydroxide, or a combination thereof.

3. The method of claim 1 , wherein the contacting of the electron auxiliary layer including the plurality of metal oxide nanoparticles with the base comprises
preparing a solution by dissolving the base in a solvent, and
applying the solution to the electron auxiliary layer to coat the electron auxiliary layer with the solution, or by immersing the electron auxiliary layer in the solution.

4. The method of claim 3 , wherein the solvent comprises water, acetone, alcohol, ether, ethyl acetate, dimethylsulfoxide (DMSO), or a combination thereof.

5. The method of claim 3 , wherein a concentration of the base in the solution is less than or equal to about 0.1 moles per liter.

6. The method of claim 1 , wherein the base has a molecular weight of less than or equal to about 200 grams per mole, and a pKb of less than or equal to about 10.

7. The method of claim 1 , further comprises drying the electron auxiliary layer, which includes the plurality of base-treated metal oxide nanoparticles, at about 0° C. to about 50° C.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Seo Hongkyu
• Kim Tae Hyung
• Jang Eun Joo
• Yoon Won Sik
• Jang Hyo Sook
• Cho Oul

Classifications

• H10K71/40

  Thermal treatment, e.g. annealing in the presence of a solvent vapour · CPC title

• H10K2102/331

  Nanoparticles used in non-emissive layers, e.g. in packaging layer · CPC title

• H10K2102/00

  Constructional details relating to the organic devices covered by this subclass · CPC title

• H10K85/60

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

• H10K71/00

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