Organic light-emitting device

Patent metadata

Field	Value
Publication number	US-12133402-B2
Application number	US-202318340664-A
Country	US
Kind code	B2
Filing date	Jun 23, 2023
Priority date	Oct 28, 2015
Publication date	Oct 29, 2024
Grant date	Oct 29, 2024

Abstract

An organic light-emitting device including: a first electrode; a second electrode facing the first electrode; a first emission unit and a second emission unit between the first electrode and the second electrode; and a first charge generation layer between the first emission unit and the second emission unit; wherein the first emission unit includes a first emission layer and a first inorganic buffer layer, and the second emission unit includes a second emission layer and a second inorganic buffer layer.

First claim

What is claimed is:

1. An organic light-emitting device comprising:
a first electrode;
a second electrode facing the first electrode;
a first emission unit and a second emission unit, a first emission unit and a second emission units being between the first electrode and the second electrode; a first charge generation layer between the first emission unit and the second emission unit;
wherein the first emission unit comprises a first emission layer, a first hole transport layer and a first inorganic buffer layer, and the first hole transport layer is between the first emission layer and the first electrode, and
the second emission unit comprises a second emission layer, a second hole transport layer and a second inorganic buffer layer, and the second hole transport layer is between the second emission layer and the first charge generation layer, and wherein,
i) the first inorganic buffer layer is between the first emission layer and the first hole transport layer, or
ii) the second inorganic buffer layer is between the second emission layer and the second hole transport layer.

2. The organic light-emitting device of claim 1 , wherein:
the first emission unit further comprises a first hole injection layer between the first hole transport layer and the first electrode, and
the second emission unit further comprises a second hole injection layer between the second hole transport layer and the first charge generation layer.

3. The organic light-emitting device of claim 1 , wherein:
the first inorganic buffer layer is directly in contact with the first emission layer, and
the second inorganic buffer layer is directly in contact with the second emission layer.

4. The organic light-emitting device of claim 1 , wherein the first inorganic buffer layer and the second inorganic buffer layer each comprises a metal halide.

5. The organic light-emitting device of claim 1 , wherein the first inorganic buffer layer and the second inorganic buffer layer each comprises at least one halide compound selected from among an alkali metal halide, an alkaline earth metal halide, a transition metal halide, a post-transition metal halide, and a lanthanum-based metal halide.

6. The organic light-emitting device of claim 1 , wherein the first inorganic buffer layer and the second inorganic buffer layer each comprises at least one iodide compound selected from the group consisting of an alkali metal iodide, an alkaline earth metal iodide, a transition metal iodide, a post-transition metal iodide, and a lanthanum-based metal iodide.

7. The organic light-emitting device of claim 1 , wherein the first inorganic buffer layer and the second inorganic buffer layer each comprises at least one iodide compound selected from the group consisting of a lithium (Li) iodide, a sodium (Na) iodide, a potassium (K) iodide, a rubidium (Rb) iodide, a cesium (Cs) iodide, a beryllium (Be) iodide, a magnesium (Mg) iodide, a calcium (Ca) iodide, a strontium (Sr) iodide, a barium (Ba) iodide, a ytterbium (Yb) iodide, a samarium (Sm) iodide, a copper (Cu) iodide, a thallium (TI) iodide, a silver (Ag) iodide, a cadmium (Cd) iodide, a mercury (Hg) iodide, a tin (Sn) iodide, a lead (Pb) iodide, a bismuth (Bi) iodide, a zinc (Zn) iodide, a manganese (Mn) iodide, an iron (Fe) iodide, a cobalt (Co) iodide, a nickel (Ni) iodide, an aluminum (Al) iodide, an indium (In) iodide, a gallium (Ga) iodide, a thorium (Th) iodide, and a uranium (U) iodide.

8. The organic light-emitting device of claim 1 , wherein the first inorganic buffer layer and the second inorganic buffer layer each comprises at least one iodide compound selected from the group consisting of LiI, NaI, KI, RbI, CsI, BeI 2 , MgI 2 , CaI 2 , SrI 2 , BaI 2 , YbI, YbI 2 , YbI 3 , SmI 3 , CuI, TII, AgI, CdI 2 , HgI 2 , SnI 2 , PbI 2 , BiI 3 , ZnI 2 , MnI 2 , FeI 2 , COI 2 , NiI 2 , AII 3 , InI 3 , GaI 3 , ThI 4 , and UI 3 .

9. The organic light-emitting device of claim 1 , wherein the first inorganic buffer layer and the second inorganic buffer layer each comprises a metal halide.

10. The organic light-emitting device of claim 4 , wherein the first inorganic buffer layer and the second inorganic buffer layer each further comprises at least one metal.

11. The organic light-emitting device of claim 4 , wherein the first inorganic buffer layer and the second inorganic buffer layer each further comprises at least one metal selected from among an alkali metal, an alkaline earth metal, a transition metal, a post-transition metal, and a lanthanum-based metal.

12. The organic light-emitting device of claim 4 , wherein the first inorganic buffer layer and the second inorganic buffer layer each further comprises at least one metal selected from the group consisting of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Yb, Sm, Cu, Tl, Ag, Cd, Hg, Sn, Pb, Bi, Zn, Mn, Fe, Co, Ni, Al, In, Ga, Th, and U.

13. The organic light-emitting device of claim 1 , wherein the first inorganic buffer layer and the second inorganic buffer layer each comprises a metal halide and a metal.

14. The organic light-emitting device of claim 1 , wherein the first inorganic buffer layer and the second inorganic buffer layer each comprises a halide compound of a first metal in addition to a second metal, and wherein the first metal is identical to the second metal.

15. The organic light-emitting device of claim 1 , wherein the first inorganic buffer layer and the second inorganic buffer layer each comprises a halide compound of a first metal in addition to a second metal, and wherein the first metal is different from the second metal.

16. The organic light-emitting device of claim 1 , wherein the first inorganic buffer layer and the second inorganic buffer layer each has a thickness of about 1 nm to about 20 nm.

17. The organic light-emitting device of claim 1 , wherein the first charge generation layer comprises an n-charge generation layer and a p-charge generation layer,
wherein the n-charge generation layer comprises an n-type dopant and the p-charge generation layer comprises a p-type dopant.

18. The organic light-emitting device of claim 1 , further comprising:
a third emission unit between the first electrode and the second electrode, and
a second charge generation layer between the second emission unit and the third emission unit,
wherein the third emission unit comprises a third emission layer and a third inorganic buffer layer, and the third inorganic buffer layer comprises at least one iodide compound selected from the group consisting of an alkali metal iodide, an alkaline earth metal iodide, a transition metal iodide, a post-transition metal iodide, and a lanthanum-based metal iodide.

19. The organic light-emitting device of claim 1 , wherein the first emission unit further comprises a first electron transport region between the first emission layer and the first charge generation layer, and the second emission unit further comprises a second electron transport region between the second emission layer and the second electrode.

Assignees

• Samsung Display Co Ltd

Inventors

• Seo Dongkyu
• Kim Dongchan
• Kim Wonjong
• Kim Eungdo
• Lee Jihye
• Im Dahea
• Yim Sanghoon
• Cho Yoonhyeung
• Han Wonsuk

Classifications

• H10K50/181

  Electron blocking layers · CPC title

• H10K2102/00

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

• H10K2101/10

  Triplet emission · CPC title

• H10K85/6576

  comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene · CPC title

• H10K85/6574

  comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes · CPC title