Organic electroluminescence element

Patent metadata

Field	Value
Publication number	US-9368739-B2
Application number	US-201414566755-A
Country	US
Kind code	B2
Filing date	Dec 11, 2014
Priority date	Jun 20, 2012
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

A light emitting device including an organic electroluminescence element is provided. The light emitting device may be a display device or a lighting device. The organic electroluminescence element includes an anode, a light emitting layer, and a cathode that are arranged in this order. An electron injection layer is arranged between the light emitting layer and the cathode. The electron injection layer is made of an amorphous C12A7 electride.

First claim

What is claimed is:

1. A light emitting device comprising an organic electroluminescence element, wherein
the light emitting device is a display device or a lighting device;
the organic electroluminescence element comprises an anode, a light emitting layer, and a cathode that are arranged in this order;
an electron injection layer is arranged between the light emitting layer and the cathode; and
the electron injection layer is made of an amorphous C12A7 electride, wherein the amorphous C12A7 electride comprises a cage containing an electron.

2. The light emitting device of claim 1 , wherein
an electron transport layer is arranged between the light emitting layer and the electron injection layer; and
the electron transport layer is made of a metal oxide material.

3. The light emitting device of claim 2 , wherein the electron transport layer is in an amorphous phase, a crystalline phase, or an amorphous-crystalline mixed phase.

4. The light emitting device of claim 2 , wherein the electron transport layer is made of ZnO—SiO 2 , In 2 O 3 —SiO 2 , SnO 2 —SiO 2 , ZnO, In—Ga—Zn—O, In—Zn—O, or SnO 2 .

5. The light emitting device of claim 1 , wherein an electron density of the amorphous C12A7 electride is within a range of 1×10 19 cm −3 to 2.3×10 21 cm −3 .

6. The light emitting device of claim 1 , wherein an electron density of the amorphous C12A7 electride is within a range of 1×10 20 cm −3 to 2.3×10 21 cm −3 .

7. The light emitting device of claim 1 , wherein an electron density of the amorphous C12A7 electride is less than or equal to 2.3×10 21 cm −3 .

8. The light emitting device of claim 1 , wherein an electron density of the amorphous C12A7 electride is within a range of 2.0×10 18 cm −3 to 2.3×10 21 cm −3 .

9. The light emitting device of claim 1 , wherein a direct current conductivity at room temperature of the amorphous C12A7 electride is within a range of 10 −9 S·cm −1 to 10 −1 S·cm −1 .

10. The light emitting device of claim 1 , wherein a direct current conductivity at room temperature of the amorphous C12A7 electride is within a range of 10 −7 S·cm −1 to 10 −3 S·cm −1 .

11. A light emitting device comprising an organic electroluminescence element, wherein
the light emitting device is a display device or a lighting device;
the organic electroluminescence element comprises an anode, a light emitting layer, and a cathode that are arranged in this order;
an electron injection layer is arranged between the light emitting layer and the cathode; and
the electron injection layer is made of an electride of an amorphous solid material comprising calcium, aluminum, and oxygen, wherein the electride comprises a cage containing an electron.

Assignees

• Tokyo Inst Tech
• Asahi Glass Co Ltd

Inventors

• Hosono Hideo
• Toda Yoshitake
• Ito Setsuro
• Watanabe Satoru
• Miyakawa Naomichi
• Ito Kazuhiro
• Watanabe Toshinari

Classifications

• H01B1/08

  oxides · CPC title

• H10K71/40

  Thermal treatment, e.g. annealing in the presence of a solvent vapour · CPC title

• H10K50/11

  characterised by the electroluminescent [EL] layers · CPC title

• H10K50/16 Primary

  Electron transporting layers · CPC title

• H01L51/5092

  Electricity · mapped topic