ORGANIC ELECTROLUMINESCENT DEVICE AND METHOD FOR MANUFACTURING THE SAME

• US 20100258797A1
• Filed: 04/13/2010
• Published: 10/14/2010
• Est. Priority Date: 04/13/2009
• Status: Abandoned Application

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: YAMAMOTO, Shinya, MATSUO, Naoto
• Application Number:
  US12/759,017
• Publication Number:
  US 20100258797A1
• Time in Patent Office: Days
• US Class Current: 257/43
• CPC Class Codes: H10K 50/171 Electron injection layers
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/40 Thermal treatment, e.g. annealing in the presence of a solvent vapour

Abstract

An organic electroluminescent device is provided, including at least one light emitting layer 5 composed of an organic material between a transparent electrode and a counter electrode, wherein the organic electroluminescent device includes an electron injection layer 6 previously provided on the organic layer side of the counter electrode which is contact disposed in a solid plate form on the organic layer and heat and pressure formed, and the electron injection layer 6 is constituted of a metal oxide. According to this configuration, it is possible to heat soften the counter electrode in a fixed plate form and join it, and it is possible to inexpensively manufacture the organic electroluminescent device 1 with ease.

Claims

1. An organic electroluminescent device, comprising:

a transparent electrode;

a counter electrode that is opposed to the transparent electrode; and

a light emitting layer made of an organic material;

wherein the light emitting layer is provided between the transparent electrode and the counter electrode;

the light emitting layer includes an electron injection layer provided between the light emitting layer and the counter electrode; and

the electron injection layer is constituted of a metal oxide.

2. The organic electroluminescent device according to claim 1, wherein the metal oxide is zinc oxide (ZnO) and titanium oxide (TiO₂).

3. The organic electroluminescent device according to claim 1, wherein the counter electrode in a solid plate form has a thickness of 5 μ

m or more.

4. The organic electroluminescent device according to claim 1, wherein the electron injection layer has a film thickness of from 10 angstroms to 200 angstroms.

5. The organic electroluminescent device according to claim 4, wherein the electron injection layer has a film thickness of from 60 angstroms to 100 angstroms.

6. The organic electroluminescent device according to claim 1, wherein the electron injection layer has a transmittance of 80% or more relative to light emitted from the organic layer and light passing through the organic layer.

7. The organic electroluminescent device according to claim 1, wherein the electron injection layer has a specific resistance of not more than 10,000 Ω

m.

8. The organic electroluminescent device according to claim 1, wherein the electron injection layer has a work function of from 4.0 eV to 6.0 eV.

9. The organic electroluminescent device according to claim 1, wherein an average surface roughness Ra of the surface of the counter electrode on which the electron injection layer is provided is thicker than a film thickness of the electron injection layer.

10. The organic electroluminescent device according to claim 1, wherein an average surface roughness Ra of the surface of the counter electrode on which the electron injection is provided is smaller than the total sum of a film thickness of the organic layer existing between the two electrodes counterpart to each other.

11. The organic electroluminescent device according to claim 1, wherein an average surface roughness Ra of the surface of the counter electrode on which the electron injection layer is provided is from 20 nm to 300 nm.

12. The organic electroluminescent device according to claim 1, wherein the at least one organic layer includes a layer made of a conductive polymer material.

13. The organic electroluminescent device according to claim 1, wherein the at least one organic layer is deposited by a coating method.

14. A manufacturing method for the organic electroluminescent device according to claim 1, comprising steps of:

forming the light emitting layer at a side of the transparent electrode;

forming the electron injection layer at a side of the counter electrode;

disposing the counter electrode so that the electron injection layer is provided at a side of the light emitting layer; and

heating and applying a load between the transparent electrode and the counter electrode.

15. The manufacturing method according to claim 14, wherein the electron

injection layer is deposited on the counter electrode by a plating method.

16. A light emitting device wherein a current and a voltage are fed to the transparent electrode and the counter electrode according to claim 1 through a conductive material connected to an external control circuit, thereby controlling light emission.

17. A display device comprising the light emitting device and the display device according to claim 14 as a light source and using for a backlight.

18. An electronic appliance comprising a display part using, as a light source, the light emitting device and the display device according to claim 14.

19. An organic electroluminescent device, comprising:

at least one light emitting layer made of an organic material between a transparent electrode and a counter electrode opposing to the transparent electrode and an electron injection layer made of a metal oxide between the light emitting layer and the counter electrode, wherein the electron injection layer is previously deposited on the counter electrode;

the counter electrode is contact disposed in a solid plate form such that the electron injection layer is disposed on the side of the light emitting layer and heat and pressure formed; and

the electron injection layer is deposited on the counter electrode by a plating method.

20. The organic electroluminescent device according to claim 19, wherein the electron injection layer deposited by the plating method has a particle size of not more than 100 nm.