Organic electroluminescent device having a photocatalyst layer

Patent metadata

Field	Value
Publication number	US-9587877-B2
Application number	US-201414903730-A
Country	US
Kind code	B2
Filing date	Jul 8, 2014
Priority date	Jul 9, 2013
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

The present invention relates to an organic electroluminescent device comprising a substrate, an organic electroluminescent element, and a photocatalyst layer, wherein the organic electroluminescent element includes: a first conductive layer provided on the substrate; an organic electroluminescent layer provided on the first conductive layer; and a second conductive layer provided on the organic electroluminescent layer, wherein the photocatalyst layer covers all or part of a light-emitting region of the organic electroluminescent element, and contains a photocatalyst and a co-catalyst, and wherein an absolute value of the difference (|R1−R2|) between the refractive index (R1) of the photocatalyst and the refractive index (R2) of the co-catalyst at a wavelength of 589 nm is 0 to 0.35.

First claim

The invention claimed is:

1. An organic electroluminescent device comprising:
a substrate;
an organic electroluminescent element; and
a photocatalyst layer;
wherein the organic electroluminescent element includes:
a first conductive layer provided on the substrate,
an organic electroluminescent layer disposed on the first conductive layer, and
a second conductive layer disposed on the organic electroluminescent layer;

wherein the photocatalyst layer covers at least part of a light-emitting region of the organic electroluminescent element and contains a photocatalyst and a co-catalyst; and
wherein an absolute value of the difference (|R1−R2|) between the refractive index (R1) of the photocatalyst and the refractive index (R2) of the co-catalyst at a wavelength of 589 nm has a value in a range from 0 to 0.35.

2. The organic electroluminescent device according to claim 1 , wherein the photocatalyst layer exhibits photocatalytic activity when exposed to visible light.

3. The organic electroluminescent device according to claim 1 , wherein the photocatalyst contains tungsten oxide, and the co-catalyst contains cerium oxide.

4. The organic electroluminescent device according to claim 3 , wherein the tungsten oxide is tungsten(VI) oxide, and the cerium oxide is cerium(IV) oxide.

5. The organic electroluminescent device according to claim 3 , wherein the cerium oxide is a doped-type co-catalyst doped with tin (Sn) within the molecule.

6. The organic electroluminescent device according to claim 1 , wherein the photocatalyst contains titanium(IV) oxide, and wherein the co-catalyst contains copper(I) oxide or copper(II) oxide and is supported on the photocatalyst.

7. The organic electroluminescent device according to claim 1 , wherein the photocatalyst layer is disposed on the organic electroluminescent element, and wherein the organic electroluminescent element is top-emission type.

8. The organic electroluminescent device according to claim 1 , wherein the organic electroluminescent element further includes a translucent insulating layer on the second conductive layer, and the photocatalyst layer is provided on the insulating layer.

9. A refrigerator comprising the organic electroluminescent device of claim 1 .

Assignees

• Nitto Denko Corp

Inventors

• Ozaki Takashi
• Ona Haruka
• Hayama Hideki
• Ban Naoki
• MIMOTO Akiko
• Fukumura Takuya
• Sambandan Ekambaram
• Mukherjee Rajesh

Classifications

• F25D29/00 Primary

  Arrangement or mounting of control or safety devices · CPC title

• F25D17/042 Primary

  Air treating means within refrigerated spaces (air conditioning in general F24F) · CPC title

• B01J23/14

  of germanium, tin or lead · CPC title

• H01L51/5253

  Electricity · mapped topic

• B01J35/004

  Operations & Transport · mapped topic