Light-Emitting Device, Light-Emitting Apparatus, Electronic Device, and Lighting Device

Patent metadata

Field	Value
Publication number	US-2023276700-A1
Application number	US-202118020490-A
Country	US
Kind code	A1
Filing date	Jul 29, 2021
Priority date	Aug 12, 2020
Publication date	Aug 31, 2023
Grant date	—

Abstract

An inexpensive light-emitting device with high emission efficiency is provided. A light-emitting device including an anode, a cathode, and an EL layer positioned between the anode and the cathode is provided. The EL layer includes a hole-transport region, a light-emitting layer, and an electron-transport region. The hole-transport region is positioned between the anode and the light-emitting layer. The electron-transport region is positioned between the cathode and the light-emitting layer. The hole-transport region contains a heteropoly acid and an organic compound having a π-electron rich aromatic ring or contains a heteropoly acid and an organic compound having a π-electron rich heteroaromatic ring. The electron-transport region contains an organic compound with an electron-transport property. The ordinary refractive index of the organic compound with an electron-transport property is higher than or equal to 1.50 and lower than or equal to 1.75 for light with a wavelength of greater than or equal to 455 nm and less than or equal to 465 nm.

First claim

1 - 4 . (canceled)

5 . A light-emitting device comprising:
an anode; a cathode; and an EL layer between the anode and the cathode, wherein the EL layer comprises a hole-transport region, a light-emitting layer, and an electron-transport region, wherein the hole-transport region is between the anode and the light-emitting layer, wherein the electron-transport region is between the cathode and the light-emitting layer, wherein the hole-transport region comprises a heteropoly acid, wherein the electron-transport region comprises an organic compound with an electron-transport property, and wherein an ordinary refractive index of the organic compound with the electron-transport property is higher than or equal to 1.50 and lower than or equal to 1.75 for light with a wavelength of greater than or equal to 455 nm and less than or equal to 465 nm.

6 . A light-emitting device comprising:
an anode; a cathode; and an EL layer between the anode and the cathode, wherein the EL layer comprises a hole-transport region, a light-emitting layer, and an electron-transport region, wherein the hole-transport region is between the anode and the light-emitting layer, wherein the electron-transport region is between the cathode and the light-emitting layer, wherein the hole-transport region comprises a heteropoly acid, wherein the electron-transport region comprises an organic compound with an electron-transport property, and wherein an ordinary refractive index of the organic compound with the electron-transport property is higher than or equal to 1.45 and lower than or equal to 1.70 for light with a wavelength of 633 nm.

7 . The light-emitting device according to claim 5 ,
wherein the hole-transport region comprises the heteropoly acid and an organic compound comprising a π-electron rich aromatic ring or comprises the heteropoly acid and an organic compound comprising a π-electron rich heteroaromatic ring.

8 . The light-emitting device according to claim 7 ,
wherein the organic compound comprising the π-electron rich aromatic ring and the organic compound comprising the π-electron rich heteroaromatic ring are each an aryl amine.

9 . The light-emitting device according to claim 5 ,
wherein the hole-transport region comprises the heteropoly acid and a tertiary amine.

10 . The light-emitting device according to claim 5 ,
wherein the heteropoly acid is phosphotungstic acid.

11 . The light-emitting device according to claim 5 ,
wherein the hole-transport region comprises an arylsulfonic acid.

12 . The light-emitting device according to claim 5 ,
wherein the hole-transport region comprises a hole-transport layer and a hole-injection layer, wherein the hole-injection layer is in contact with the anode, and wherein the hole-injection layer comprises the heteropoly acid and a secondary amine.

13 - 14 . (canceled)

15 . The light-emitting device according to claim 5 ,
wherein the light-emitting layer comprises an iridium complex.

16 - 17 . (canceled)

18 . The light-emitting device according to claim 15 ,
wherein the iridium complex is an iridium complex represented by Structural Formula (301).

19 . The light-emitting device according to claim 5 ,
wherein the organic compound with the electron-transport property comprises at least one nitrogen-containing six-membered heteroaromatic ring, two benzene rings, one or more aromatic hydrocarbon rings each having 6 to 14 carbon atoms, and a plurality of hydrocarbon groups forming a bond by sp 3 hybrid orbitals, and wherein the total number of carbon atoms forming the bond by the sp 3 hybrid orbitals accounts for higher than or equal to 10% and lower than or equal to 60% of the total number of carbon atoms in a molecule of the organic compound with the electron-transport property.

20 . The light-emitting device according to claim 5 ,
wherein the electron-transport region comprises an electron-transport layer and an electron-injection layer, wherein the electron-injection layer is in contact with the cathode, and wherein the electron-transport layer comprises the organic compound with the electron-transport property.

21 . The light-emitting device according to claim 20 ,
wherein the electron-transport layer comprises a metal complex of an alkali metal or an alkaline earth metal.

22 . The light-emitting device according to claim 21 ,
wherein the metal complex comprises a ligand comprising an 8-quinolinolato structure.

23 . The light-emitting device according to claim 21 ,
wherein the metal complex is a metal complex of lithium.

24 . (canceled)

25 . The light-emitting device according to claim 20 ,
wherein the electron-injection layer comprises a heteroaromatic compound.

26 . The light-emitting device according to claim 25 ,
wherein the heteroaromatic compound is 2-phenyl-9-[3-(9-phenyl-1,10-phenanthrolin-2-yl)phenyl]-1,10-phenanthroline.

27 . The light-emitting device according to claim 20 ,
wherein the electron-injection layer comprises fluorine and sodium.

28 . The light-emitting device according to claim 20 ,
wherein the electron-injection layer comprises barium.

29 - 33 . (canceled)

34 . The light-emitting device according to claim 5 ,
wherein the hole-transport region comprises a layer formed by applying and baking varnish comprising the heteropoly acid.

35 . The light-emitting device according to claim 6 ,
wherein the hole-transport region comprises the heteropoly acid and an organic compound comprising a π-electron rich aromatic ring or comprises the heteropoly acid and an organic compound comprising a π-electron rich heteroaromatic ring.

36 . The light-emitting device according to claim 35 ,
wherein the organic compound comprising the π-electron rich aromatic ring and the organic compound comprising the π-electron rich heteroaromatic ring are each an aryl amine.

37 . The light-emitting device according to claim 6 ,
wherein the hole-transport region comprises a layer formed by applying and baking varnish comprising the heteropoly acid.

Assignees

• Semiconductor Energy Lab

Inventors

• Kawano Yuta
• Ueda Airi
• Watabe Takeyoshi
• Ohsawa Nobuharu
• Tosu Keito
• Osaka Harue
• Seo Satoshi

Classifications

• H10K59/879

  comprising refractive means, e.g. lenses · CPC title

• H10K59/80524

  Transparent cathodes, e.g. comprising thin metal layers · CPC title

• H10K85/654 Primary

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

• C09K11/06 Primary

  containing organic luminescent materials · CPC title

• C09K2211/1018

  Heterocyclic compounds · CPC title