Light emitting element and display device including the same

Patent metadata

Field	Value
Publication number	US-2025212600-A1
Application number	US-202418810378-A
Country	US
Kind code	A1
Filing date	Aug 20, 2024
Priority date	Dec 22, 2023
Publication date	Jun 26, 2025
Grant date	—

Abstract

A light emitting element according to an embodiment includes a first electrode, two or more light emitting units on the first electrode, and a second electrode on the two or more light emitting units, wherein the second electrode includes silver-lithium (Ag—Li), and the light emitting unit at the top of the two or more light emitting units includes ytterbium, and it includes any one selected from an electron injection layer including ytterbium, and an electron injection layer doped with a metal in a compound represented by the following Formula 1.

First claim

What is claimed is:

1 . A light emitting element, comprising:
a first electrode; two or more light emitting units on the first electrode; and a second electrode on the two or more light emitting units, wherein the second electrode comprises silver-lithium (Ag—Li), and a light emitting unit at the top among the two or more light emitting units comprises: any one selected from an electron injection layer comprising ytterbium and an electron injection layer doped with a metal in a compound represented by the following Formula 1:

2 . The light emitting element of claim 1 , wherein:
the metal doped in the compound represented by Formula 1 comprises Li.

3 . The light emitting element of claim 1 , wherein:
the lithium contained in the second electrode is contained in an amount of 50 vol % or less based on 100 vol % of the second electrode.

4 . The light emitting element of claim 1 , wherein:
the second electrode has a thickness of 80 angstroms to 140 angstroms.

5 . The light emitting element of claim 1 , wherein:
the second electrode is a single layer.

6 . The light emitting element of claim 1 , wherein:
the two or more light emitting units comprise a first light emitting unit, a second light emitting unit, a third light emitting unit, and a fourth light emitting unit sequentially stacked.

7 . The light emitting element of claim 6 , wherein:
the two or more light emitting units emit different lights.

8 . The light emitting element of claim 6 , wherein:
the first to third light emitting units emit blue light, and the fourth light emitting unit emits green light.

9 . A display device, comprising:
the light emitting element of claim 1 .

10 . A light emitting element, comprising:
a first electrode; two or more light emitting units on the first electrode; and a second electrode on the two or more light emitting units, wherein the second electrode comprises: a first sub-electrode comprising silver-magnesium (Ag—Mg), and a second sub-electrode comprising silver-lithium (Ag—Li).

11 . The light emitting element of claim 10 , wherein:
the light emitting unit at the top among the two or more light emitting units comprises: any one selected from an electron injection layer comprising ytterbium and an electron injection layer doped with a metal in a compound represented by the following Formula 1:

12 . The light emitting element of claim 11 , wherein:
the metal doped in the compound represented by Formula 1 comprises Li.

13 . The light emitting element of claim 11 , wherein:
the first sub-electrode comprises silver and magnesium in a volume ratio of 99:1 to 50:50.

14 . The light emitting element of claim 11 , wherein:
the second sub-electrode comprises silver and lithium in a volume ratio of 99:1 to 50:50.

15 . The light emitting element of claim 10 , wherein:
the second electrode has a thickness of 200 angstroms or less.

16 . The light emitting element of claim 15 , wherein:
a thickness ratio of the first sub-electrode and the second sub-electrode is 1:9 to 9:1.

17 . The light emitting element of claim 11 , wherein:
the two or more light emitting units comprise a first light emitting unit, a second light emitting unit, a third light emitting unit, and a fourth light emitting unit sequentially stacked.

18 . The light emitting element of claim 17 , wherein:
the two or more light emitting units emit different lights.

19 . The light emitting element of claim 18 , wherein:
the first to third light emitting units emit blue light, and the fourth light emitting unit emits green light.

20 . A display device, comprising:
the light emitting element of claim 10 .

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Hakchoong
• Kang Pilgu
• Kim Dong Chan
• Moon Ji Young
• Lee Jongwon
• Lee Chang-Min
• Choi Jung Ho
• Hwang Jae Hoon

Classifications

• H10K2102/351

  Thickness · CPC title

• H10K85/6572 Primary

  comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole · CPC title

• H10K50/13

  comprising stacked EL layers within one EL unit · CPC title

• H10K50/826

  Multilayers, e.g. opaque multilayers · CPC title

• H10K50/81

  Anodes · CPC title