Organic electroluminescence device including a micro-cavity light extraction structure

Patent metadata

Field	Value
Publication number	US-10219349-B2
Application number	US-201515506976-A
Country	US
Kind code	B2
Filing date	Aug 24, 2015
Priority date	Aug 29, 2014
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

An organic electroluminescence device according to one aspect of the present invention includes: a base material in which a recess is provided at an upper surface of the base material; a reflective layer that is provided at least along a surface of the recess; a filling layer that is filled into an inside of the recess via the reflective layer, the filling layer having light transmissivity; a first electrode that is provided at least on a layer above the filling layer, the first electrode having light transmissivity and light reflectivity; an organic layer that is provided on a layer above the first electrode, the organic layer including at least a light-emitting layer; and a second electrode that is provided on a layer above the organic layer, the second electrode having light transmissivity and light reflectivity. A part of the reflective layer contacts a part of the first electrode.

First claim

The invention claimed is:

1. An organic electroluminescence device comprising:
a base material in which a recess is provided at a first upper surface of the base material;
a reflective layer that is provided at least along a surface of the recess;
a filling layer that is filled into an inside of the recess via the reflective layer, the filling layer having light transmissivity;
a first electrode that is provided at least on a layer above the filling layer, the first electrode having light transmissivity;
an organic layer that is provided on a layer above the first electrode, the organic layer comprising at least a light-emitting layer; and
a second electrode that is provided on a layer above the organic layer, the second electrode having light transmissivity and light reflectivity, wherein
a portion of the reflective layer contacts a portion of the first electrode,
the first electrode includes a step that extends along an edge portion of the recess, and
the first electrode contacts the reflective layer at the edge portion.

2. The organic electroluminescence device according to claim 1 , the organic electroluminescence device further comprising:
a semi-transmissive/reflective film that is provided between the first electrode and the reflective layer, the semi-transmissive/reflective film having light transmissivity and light reflectivity.

3. The organic electroluminescence device according to claim 2 , wherein
the filling layer comprises a first filling layer and second filling layer, and
the semi-transmissive/reflective film is provided between the first filling layer and the second filling layer.

4. The organic electroluminescence device according to claim 1 , wherein a lower surface of the first electrode at a position in the recess is positioned below a plane that includes the first upper surface.

5. The organic electroluminescence device according to claim 4 , wherein the lower surface of the light-emitting layer at a position in the recess is positioned lower than a plane that includes the first upper surface.

6. The organic electroluminescence device according to claim 1 , wherein the second electrode is constituted by a metal film.

7. The organic electroluminescence device according to claim 1 , wherein a cross-section shape of the recess cut by an arbitrary plane that is perpendicular to the first upper surface is an arc.

8. An illumination device comprising:
the organic electroluminescence device according to claim 1 .

9. An illumination device comprising:
the organic electroluminescence device according to claim 2 .

10. A display device comprising:
the organic electroluminescence device according to claim 1 .

11. A display device comprising:
the organic electroluminescence device according to claim 2 .

12. The organic electroluminescence device according to claim 1 , wherein the first electrode has light reflectivity in addition to the light transmissivity.

13. The illumination device according to claim 8 , wherein the first electrode has light reflectivity in addition to the light transmissivity.

14. The display device according to claim 10 , wherein the first electrode has light reflectivity in addition to the light transmissivity.

15. The organic electroluminescence device according to claim 1 , wherein a second upper surface of the filling layer at a position in the recess is positioned below a plane that includes a third upper surface of the reflective layer.

16. The organic electroluminescence device according to claim 1 , wherein a lower surface of the first electrode at a position in the recess is positioned below a plane that includes a second upper surface of the reflective layer.

Assignees

• Sharp Kk

Inventors

• Matsunaga Kazuki
• Kikuchi Katsuhiro
• Uchida Hideki
• Inoue Satoshi
• Ohara Masanori
• Koike Eiji
• Tsukamoto Yuto
• Isomura Yoshiyuki

Classifications

• H05B33/28

  of translucent electrodes · CPC title

• H05B45/60 Primary

  Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED] · CPC title

• H05B33/24

  of metallic reflective layers (H05B33/26 takes precedence) · CPC title

• H05B33/10

  Apparatus or processes specially adapted to the manufacture of electroluminescent light sources · CPC title

• H05B33/0896 Primary

  Electricity · mapped topic