Light-Emitting Device

Patent metadata

Field	Value
Publication number	US-2025268013-A1
Application number	US-202519051731-A
Country	US
Kind code	A1
Filing date	Feb 12, 2025
Priority date	Feb 16, 2024
Publication date	Aug 21, 2025
Grant date	—

Abstract

A light-emitting device includes a first electrode, a second electrode, and an organic compound layer over a first insulating layer. The organic compound layer is between the first electrode and the second electrode. The second electrode and the organic compound layer are separated from a second electrode and an organic compound layer of at least one of a plurality of light-emitting devices adjacent to the light-emitting device. An outline of the second electrode and an outline of the organic compound layer are substantially aligned with each other when seen from a direction substantially perpendicular to a surface of the first insulating layer on which the first electrode is formed. The organic compound layer includes a light-emitting layer and an electron-injection layer. The electron-injection layer includes metal or a metal compound, a first organic compound, and a second organic compound. The first organic compound includes a π-electron deficient heteroaromatic ring. The second organic compound includes two or more heteroaromatic rings. The two or more heteroaromatic rings are bonded or condensed to each other and include three or more heteroatoms in total. The second organic compound interacts with the metal or the metal compound by two or more of the three or more heteroatoms as a multidentate ligand.

First claim

What is claimed is:

1 . A light-emitting device comprising:
a first electrode over a first insulating layer; a second electrode over the first insulating layer; and an organic compound layer over the first insulating layer, wherein the first electrode is in contact with the first insulating layer, wherein the organic compound layer is between the first electrode and the second electrode, wherein the second electrode and the organic compound layer are separated from a second electrode and an organic compound layer of at least one of a plurality of light-emitting devices adjacent to the light-emitting device, wherein an outline of the second electrode and an outline of the organic compound layer are aligned or substantially aligned with each other when seen from a direction perpendicular to the first insulating layer on which the first electrode is formed, wherein the organic compound layer comprises a light-emitting layer and an electron-injection layer, wherein the electron-injection layer comprises metal or a metal compound, a first organic compound, and a second organic compound, wherein the first organic compound comprises a π-electron deficient heteroaromatic ring, wherein the second organic compound comprises two or more heteroaromatic rings, wherein the two or more heteroaromatic rings are bonded or condensed to each other and comprise three or more heteroatoms in total, and wherein the second organic compound interacts with the metal or the metal compound by two or more of the three or more heteroatoms as a multidentate ligand.

2 . The light-emitting device according to claim 1 ,
wherein the organic compound layer comprises a p-type layer between the electron-injection layer and the second electrode, and wherein the p-type layer comprises a third organic compound having a hole-transport property and a metal oxide or a fourth organic compound comprising at least one of a halogen group and a cyano group.

3 . A light-emitting device,
wherein the light-emitting device is one of a plurality of light-emitting devices included in a group of light-emitting devices, the group of light-emitting devices comprising: a group of first electrodes over the same insulating surface; a group of second electrodes facing the group of first electrodes; and a group of first layers between the group of first electrodes and the group of second electrodes, wherein the light-emitting device comprises a first electrode, a second electrode, and a first layer, wherein the first electrode is one of the group of first electrodes, wherein the first electrode is independent of first electrodes of the plurality of light-emitting devices, wherein the first layer is one of the group of first layers, wherein the first layer is independent of first layers of the plurality of light-emitting devices, wherein the second electrode is one of the group of second electrodes, wherein the second electrode is independent of second electrodes of the plurality of light-emitting devices, wherein the second electrode and the first layer overlap with the first electrode, wherein the first layer comprises a light-emitting layer and an electron-injection layer, wherein the electron-injection layer comprises metal or a metal compound, a first organic compound, and a second organic compound, wherein the first organic compound comprises π-electron deficient heteroaromatic ring, wherein the second organic compound comprises two or more heteroaromatic rings, wherein the two or more heteroaromatic rings are bonded or condensed to each other and comprise three or more heteroatoms in total, wherein the second organic compound interacts with the metal or the metal compound by two or more of the three or more heteroatoms as a multidentate ligand, and wherein a distance between the first layer included in the light-emitting device and a first layer included in another light-emitting device adjacent to the light-emitting device is greater than or equal to 0.5 μm and less than or equal to 5 μm.

4 . The light-emitting device according to claim 3 ,
wherein the first layer comprises a p-type layer between the electron-injection layer and the second electrode, and wherein the p-type layer comprises a third organic compound having a hole-transport property and a metal oxide or a fourth organic compound comprising at least one of a halogen group and a cyano group.

5 . The light-emitting device according to claim 3 , wherein an outline of the second electrode and an outline of the first layer are aligned or substantially aligned with each other when seen from a direction perpendicular to the insulating surface.

6 . The light-emitting device according to claim 3 ,
wherein in a cross-sectional view, an end portion of the second electrode and an end portion of the first layer are aligned with each other in a direction perpendicular or substantially perpendicular to the insulating surface.

7 . The light-emitting device according to claim 1 ,
wherein the second organic compound is represented by General Formula (G1-1):

 , and
wherein in General Formula (G1-1), each of A 1 , A 2 , and A 3 independently represents a substituted or unsubstituted heteroaromatic ring having 1 to 30 carbon atoms.

8 . The light-emitting device according to claim 1 ,
wherein the second organic compound is represented by General Formula (G1-2):

 , and
wherein in General Formula (G1-2), each of A 1 and A 2 independently represents a substituted or unsubstituted heteroaromatic ring having 1 to 30 carbon atoms and A 1 comprises two or more nitrogen atoms.

9 . The light-emitting device according to claim 1 ,
wherein the heteroaromatic rings each are a π-electron deficient heteroaromatic ring.

10 . The light-emitting device according to claim 1 ,
wherein the heteroaromatic rings comprise at least one of a pyridine ring, a pyrazine ring, a pyrimidine ring, a pyridazine ring, a triazine ring, an imidazole ring, a pyrazole ring, an oxazole ring, a thiazole ring, and a triazole ring.

11 . The light-emitting device according to claim 1 ,
wherein at least one of the heteroaromatic rings included in the second organic compound comprises a diazine ring or a triazine ring, and wherein the diazine ring is one of a pyrazine ring, a pyrimidine ring, and a pyridazine ring.

12 . The light-emitting device according to claim 1 ,
wherein the heteroaromatic rings included in the second organic compound comprise three or more pyridine rings in total.

13 . The light-emitting device according to claim 1 ,
wherein the first organic compound comprises an electron-donating group.

14 . The light-emitting device according to claim 13 ,
wherein the electron-donating group is at least one of an alkyl group, an alkoxy group, an aryloxy group, an alkylamino group, an arylamino group, and a heterocyclic amino group.

15 . The light-emitting device according to claim 1 ,
wherein the first organic compound has an acid dissociation constant pK a of 8 or more.

16 . The light-emitting device according to claim 1 ,
wherein the first organic compound comprises a phenanthroline ring.

17 . The light-emitting device according to claim 1 ,
wherein the second organic compound has a glass transition temperature T g of 100° C. or higher.

Assignees

• Semiconductor Energy Lab

Inventors

• Ohsawa Nobuharu
• Sasaki Toshiki
• Seo Hiromi
• Fukuzaki Shinya

Classifications

• H10K85/657

  Polycyclic condensed heteroaromatic hydrocarbons · CPC title

• H10K85/615

  Polycyclic condensed aromatic hydrocarbons, e.g. anthracene · CPC title

• H10K50/171

  Electron injection layers · CPC title

• H10K50/11 Primary

  characterised by the electroluminescent [EL] layers · CPC title

• H10K2101/40

  Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers · CPC title