Light-emitting device and display device

Patent metadata

Field	Value
Publication number	US-2025221157-A1
Application number	US-202418982667-A
Country	US
Kind code	A1
Filing date	Dec 16, 2024
Priority date	Dec 28, 2023
Publication date	Jul 3, 2025
Grant date	—

Abstract

A light-emitting device having favorable characteristics is provided. The light-emitting device includes a first electrode, a second electrode, an intermediate layer positioned between the first and second electrodes, a first light-emitting layer, a second light-emitting layer, a first electron-transport layer, and a second electron-transport layer. The first light-emitting layer is positioned between the first electrode and the intermediate layer, the second light-emitting layer is positioned between the intermediate layer and the second electrode, the first electron-transport layer is positioned between the first light-emitting layer and the intermediate layer, the second electron-transport layer is positioned between the second light-emitting layer and the second electrode, the second electron-transport layer includes a first organic compound having a triazine skeleton, the intermediate layer includes a second organic compound having a phenanthroline skeleton, the first light-emitting layer and the second light-emitting layer include the same emission center substance, and the first light-emitting layer and the second light-emitting layer are separated from a light-emitting layer included in at least one of a plurality of light-emitting devices adjacent to the light-emitting device.

First claim

What is claimed is:

1 . A light-emitting device comprising:
a first electrode; a second electrode; an intermediate layer; a first light-emitting layer; a second light-emitting layer; a first electron-transport layer; and a second electron-transport layer, wherein the intermediate layer is positioned between the first electrode and the second electrode, wherein the first light-emitting layer is positioned between the first electrode and the intermediate layer, wherein the second light-emitting layer is positioned between the intermediate layer and the second electrode, wherein the first electron-transport layer is positioned between the first light-emitting layer and the intermediate layer, wherein the second electron-transport layer is positioned between the second light-emitting layer and the second electrode, wherein the second electron-transport layer comprises a first organic compound having a triazine skeleton, wherein the intermediate layer comprises a mixed layer of a second organic compound having a phenanthroline skeleton and one of lithium and a lithium compound, wherein the first light-emitting layer comprises a first emission center substance, wherein the second light-emitting layer comprises a second emission center substance, wherein a difference between a maximum peak wavelength in an emission spectrum of the first emission center substance and a maximum peak wavelength in an emission spectrum of the second emission center substance is less than or equal to 30 nm, and wherein the first light-emitting layer and the second light-emitting layer are each different from a light-emitting layer included in at least one of a plurality of light-emitting devices adjacent to the light-emitting device.

2 . The light-emitting device according to claim 1 , wherein the first electron-transport layer comprises a third organic compound having a triazine skeleton.

3 . The light-emitting device according to claim 2 , wherein the first organic compound and the third organic compound are the same organic compound.

4 . The light-emitting device according to claim 1 , wherein the first electron-transport layer comprises a fourth organic compound having no triazine skeleton.

5 . The light-emitting device according to claim 1 , wherein the first electron-transport layer comprises a fourth organic compound having at least one of a pyrimidine skeleton, an imidazole skeleton, and an anthracene skeleton.

6 . A light-emitting device comprising:
a first electrode; a second electrode; an intermediate layer; a first light-emitting layer; a second light-emitting layer; a first electron-transport layer; and a second electron-transport layer, wherein the intermediate layer is positioned between the first electrode and the second electrode, wherein the first light-emitting layer is positioned between the first electrode and the intermediate layer, wherein the second light-emitting layer is positioned between the intermediate layer and the second electrode, wherein the first electron-transport layer is positioned between the first light-emitting layer and the intermediate layer, wherein the second electron-transport layer is positioned between the second light-emitting layer and the second electrode, wherein the second electron-transport layer comprises a first organic compound having a triazine skeleton, wherein the intermediate layer comprises a second organic compound having a phenanthroline skeleton, wherein the first electron-transport layer comprises a third organic compound having a triazine skeleton, wherein the first light-emitting layer comprises a first emission center substance, wherein the second light-emitting layer comprises a second emission center substance, wherein a difference between a maximum peak wavelength in an emission spectrum of the first emission center substance and a maximum peak wavelength in an emission spectrum of the second emission center substance is less than or equal to 30 nm, and wherein the first light-emitting layer and the second light-emitting layer are each different from a light-emitting layer included in at least one of a plurality of light-emitting devices adjacent to the light-emitting device.

7 . The light-emitting device according to claim 6 , wherein the first organic compound and the third organic compound are the same organic compound.

8 . The light-emitting device according to claim 6 , wherein the intermediate layer comprises one of lithium and a lithium compound.

9 . The light-emitting device according to claim 8 , wherein the intermediate layer comprises a mixed layer of the second organic compound and one of the lithium and the lithium compound.

10 . A display device comprising:
a first light-emitting device; and a second light-emitting device, wherein the first light-emitting device and the second light-emitting device are adjacent to each other, wherein the first light-emitting device comprises:
a first electrode;
a second electrode;
a first intermediate layer;
a first light-emitting layer;
a second light-emitting layer;
a first electron-transport layer; and
a second electron-transport layer,
wherein the first intermediate layer is positioned between the first electrode and the second electrode, wherein the first light-emitting layer is positioned between the first electrode and the first intermediate layer, wherein the second light-emitting layer is positioned between the first intermediate layer and the second electrode, wherein the first electron-transport layer is positioned between the first light-emitting layer and the first intermediate layer, wherein the second electron-transport layer is positioned between the second light-emitting layer and the second electrode, wherein the second light-emitting device comprises:
a third electrode;
a fourth electrode;
a second intermediate layer;
a third light-emitting layer;
a fourth light-emitting layer;
a third electron-transport layer; and
a fourth electron-transport layer,
wherein the second intermediate layer is positioned between the third electrode and the fourth electrode, wherein the third light-emitting layer is positioned between the third electrode and the second intermediate layer, wherein the fourth light-emitting layer is positioned between the second intermediate layer and the fourth electrode, wherein the third electron-transport layer is positioned between the third light-emitting layer and the second intermediate layer, wherein the fourth electron-transport layer is positioned between the fourth light-emitting layer and the fourth electrode, wherein the second electron-transport layer and the fourth electron-transport layer each comprise a first organic compound having a triazine skeleton, wherein the second electron-transport layer and the fourth electron-transport layer are made of the same material, wherein the first intermediate layer and the second intermediate layer each comprise a second organic compound having a phenanthroline skeleton and one of lithium and a lithium compound, wherein the first light-emitting layer comprises a first emission center substance, wherein the second light-emitting layer comprises a second emission center substance, wherein the third light-emitting layer comprises a third emission center substance, wherein the fourth light-emitting layer comprises a fourth emission center substance, wherein a difference between a maximum peak wavelength in an emission spectrum of the first emission center substance and a maximum peak wavelength in an emission spectrum of the second emission center substance is less than or equal to 30 nm, wherein a difference bet

Assignees

• Semiconductor Energy Lab

Inventors

• Seo Satoshi
• Ohsawa Nobuharu
• Seo Hiromi
• Kido Hiromitsu
• Matsubaba Tomoe
• Hayashi Yuki

Classifications

• H10K59/10

  OLED displays · CPC title

• H10K85/654

  comprising only nitrogen as heteroatom (H10K85/652 takes precedence) · CPC title

• H10K50/16

  Electron transporting layers · CPC title

• H10K50/13 Primary

  comprising stacked EL layers within one EL unit · CPC title

• H10K50/11

  characterised by the electroluminescent [EL] layers · CPC title