Light emitting element and display device including the same and method for manufacturing display device

Patent metadata

Field	Value
Publication number	US-11955468-B2
Application number	US-202016932591-A
Country	US
Kind code	B2
Filing date	Jul 17, 2020
Priority date	Aug 2, 2019
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

Provided is a light emitting element according to embodiments which includes a body including a semiconductor layer and an active layer, and a ligand including a head portion bonded to a surface of the body, an end portion spaced apart from the body, and having a positive or a negative charge, and a chain portion connecting the head portion and the end portion.

First claim

What is claimed is:

1. A light emitting element comprising:
a body comprising:
a semiconductor layer;
an active layer; and
an insulating film covering a side surface of the semiconductor layer and the active layer, and comprising a metal oxide;

a ligand comprising:
a head portion bonded to the insulating film at an exterior surface of the body, the head portion being a hydroxyl group, a thiol group, a catechol group, or a carboxyl group, wherein the exterior surface of the body is a surface that defines an outermost surface of the body;
an end portion spaced apart from the body, and having a positive or a negative charge; and
a chain portion connecting the head portion and the end portion.

2. The light emitting element of claim 1 , wherein the semiconductor layer comprises a first semiconductor layer, and a second semiconductor layer spaced apart from the first semiconductor layer with the active layer therebetween.

3. The light emitting element of claim 2 , wherein the body further comprises:
a first contact electrode adjacent to the first semiconductor layer; and
a second contact electrode adjacent to the second semiconductor layer.

4. The light emitting element of claim 1 , wherein the ligand comprises a first ligand comprising a first end portion having a positive charge, and
wherein the light emitting element further comprises a second ligand comprising a second end portion having a negative charge.

5. The light emitting element of claim 4 , wherein the body comprises:
a first side surface to which the first ligand is bonded; and
a second side surface facing the first side surface, and to which the second ligand is bonded.

6. The light emitting element of claim 1 , wherein the chain portion comprises a substituted or an unsubstituted alkyl group, a substituted or an unsubstituted amine group, a substituted or an unsubstituted oxy group, a substituted or an unsubstituted thiol group, a substituted or an unsubstituted ester group, or a substituted or an unsubstituted amide group.

7. The light emitting element of claim 1 , wherein a length of the body is in a range from about 1 μm to about 100 μm.

8. A display device comprising:
a pixel circuit;
an insulating layer covering the pixel circuit;
a first electrode on the insulating layer, and electrically connected to the pixel circuit;
a second electrode on the insulating layer, and spaced apart from the first electrode; and
a plurality of light emitting elements electrically connected to the first electrode and the second electrode, the plurality of light emitting elements comprising:
a body comprising an insulating film covering a side surface of a semiconductor layer and an active layer, and comprising a metal oxide; and
a ligand comprising:
a head portion bonded to the insulating film at an exterior surface of the body, the head portion being a hydroxyl group, a thiol group, a catechol group, or a carboxyl group, wherein the exterior surface of the body is a surface that defines an outermost surface of the body;
an end portion spaced apart from the body, and having a positive or a negative charge; and
a chain portion connecting the head portion and the end portion.

9. The display device of claim 8 , wherein the body comprises:
a first contact electrode electrically connected to the first electrode;
a first semiconductor layer on the first contact electrode;
an active layer on the first semiconductor layer;
a second semiconductor layer spaced apart from the first semiconductor layer with the active layer therebetween; and
a second contact electrode on the second semiconductor layer, and electrically connected to the second electrode.

10. The display device of claim 9 , wherein the light emitting elements comprise a first light emitting element comprising a first ligand having a positive charge, and a second light emitting element adjacent to the first light emitting element and comprising a second ligand having a negative charge.

11. The display device of claim 10 , wherein:
the first ligand comprises a first end portion having a positive charge;
the second ligand comprises a second end portion having a negative charge; and
the first end portion and the second end portion are electrostatically bonded to each other.

Assignees

• Samsung Display Co Ltd

Inventors

• Jung Yunku
• Kim Sungwoon
• Lee Changhee
• Ha Jaekook
• Ko Yunhyuk
• Kim Jaehoon
• Nam Minki
• Doh Hyunmi
• Park Myoungjin
• Park Jae Hong
• Park Junwoo

Classifications

• H10W90/733

  between laterally-adjacent chips · CPC title

• H10W80/165

  using passive alignment, e.g. using self-alignment · CPC title

• H10W72/07341

  Controlling the bonding environment, e.g. atmosphere composition or temperature · CPC title

• H10W72/07331

  Connecting techniques · CPC title

• H10W72/0198

  batch processes · CPC title