Organic electroluminescence device, illumination device, and display device

Patent metadata

Field	Value
Publication number	US-10143062-B2
Application number	US-201515525292-A
Country	US
Kind code	B2
Filing date	Nov 6, 2015
Priority date	Nov 12, 2014
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

An organic electroluminescence device according to one aspect of the present invention includes: a base material having a top surface on which a recess is provided; a reflective layer provided along at least a surface of the recess; a filling layer filled in the recess via the reflective layer, the filling layer having light transmissivity; a first electrode provided at least on an upper layer side of the filling layer, the first electrode having light transmissivity; an organic layer provided on an upper layer side of the first electrode, the organic layer including at least a light emitting layer; and a second electrode provided on an upper layer side of the organic layer, the second electrode having light transmissivity. The second electrode has a reflectance of 70% or less.

First claim

The invention claimed is:

1. An organic electroluminescence device comprising:
a base material having a top surface on which a recess is provided;
a reflective layer provided along at least a surface of the recess;
a filling layer filled in the recess via the reflective layer, the filling layer having light transmissivity;
a first electrode provided at least on an upper layer side of the filling layer, the first electrode having light transmissivity;
an organic layer provided on an upper layer side of the first electrode, the organic layer comprising at least a light emitting layer;
a second electrode provided on an upper layer side of the organic layer, the second electrode having light transmissivity; and
low refractive index layers whose refractive indexes are lower than that of the second electrode, the low refractive index layers being provided on the second electrode,
wherein the second electrode has a reflectance of 70% or less.

2. The organic electroluminescence device according to claim 1 ,
wherein the second electrode has a light transmittance of 30% or more.

3. The organic electroluminescence device according to claim 1 ,
wherein the second electrode comprises a metal layer.

4. The organic electroluminescence device according to claim 3 ,
wherein a transparent conductive film is laminated on the metal layer.

5. The organic electroluminescence device according to claim 1 ,
wherein the second electrode is a transparent conductive film.

6. The organic electroluminescence device according to claim 5 ,
wherein the organic layer comprises a doping layer that is obtained by doping an electron transporting material with a metal or a metal compound and has an electron injection function.

7. The organic electroluminescence device according to claim 1 ,
wherein an auxiliary electrode made of a metal that is electrically connected to the second electrode is provided.

8. The organic electroluminescence device according to claim 1 ,
wherein the plurality of low refractive index layers are laminated on the second electrode.

9. The organic electroluminescence device according to claim 8 ,
wherein, among the plurality of low refractive index layers, the low refractive index layer on the upper layer side has a lower refractive index than that of the low refractive index layer on the lower layer side.

10. The organic electroluminescence device according to claim 1 ,
wherein an upper part has a lower refractive index than that of a lower part in the low refractive index layer.

11. The organic electroluminescence device according to claim 1 ,
wherein a part of the reflective layer is in contact with a part of the first electrode.

12. The organic electroluminescence device according to claim 1 ,
wherein a bottom surface of the first electrode at a position of the recess is positioned lower than a plane including a top surface of the base material.

13. The organic electroluminescence device according to claim 1 ,
wherein the recess has a cross-sectional shape in at least one axial direction that is an arc shape.

14. An organic electroluminescence device comprising:
a base material having a top surface on which a recess is provided;
a reflective layer provided along at least a surface of the recess;
a filling layer filled in the recess via the reflective layer, the filling layer having light transmissivity;
a first electrode provided at least on an upper layer side of the filling layer, the first electrode having light transmissivity;
an organic layer provided on an upper layer side of the first electrode, the organic layer comprising at least a light emitting layer; and
a second electrode provided on an upper layer side of the organic layer, the second electrode having light transmissivity,
wherein the second electrode has a reflectance of 70% or less, and
a bottom surface of the first electrode at a position of the recess is positioned lower than a plane including a top surface of the base material.

15. The organic electroluminescence device according to claim 14 ,
wherein the second electrode has a light transmittance of 30% or more.

16. The organic electroluminescence device according to claim 14 ,
wherein the second electrode comprises a metal layer.

17. The organic electroluminescence device according to claim 16 ,
wherein a transparent conductive film is laminated on the metal layer.

18. The organic electroluminescence device according to claim 14 ,
wherein the second electrode is a transparent conductive film.

19. The organic electroluminescence device according to claim 14 ,
wherein an auxiliary electrode made of a metal that is electrically connected to the second electrode is provided.

20. The organic electroluminescence device according to claim 14 ,
wherein the recess has a cross-sectional shape in at least one axial direction that is an arc shape.

Assignees

• Sharp Kk

Inventors

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

Classifications

• H01L51/50

  Electricity · mapped topic

• H01L2251/5361

  Electricity · mapped topic

• H01L27/32

  Electricity · mapped topic

• H05B33/145 Primary

  Arrangements of the electroluminescent material · CPC title

• G09F9/30

  in which the desired character or characters are formed by combining individual elements (panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00) · CPC title