Organic electroluminescent panel

Patent metadata

Field	Value
Publication number	US-9748316-B2
Application number	US-201415032381-A
Country	US
Kind code	B2
Filing date	Oct 24, 2014
Priority date	Oct 28, 2013
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

The present invention provides an organic electroluminescent panel capable of increasing the luminous efficacy and decreasing the driving voltage of a top emission (TE) organic EL element. The organic electroluminescent panel of the present invention includes: a substrate; and an organic electroluminescent element provided on the substrate. The organic electroluminescent element is a top emission element that includes, in the order from the substrate side: an anode; a light-emitting layer; an electron transport layer; a first metal layer; a p-type oxide layer; and a transparent cathode. The top emission element is configured to emit light from the transparent cathode side. The light-emitting layer and the electron transport layer are each formed from an organic material. At least one of a mixture layer of a p-type oxide and a hole transport material and a second metal layer is provided between the electron transport layer and the transparent cathode.

First claim

The invention claimed is:

1. An organic electroluminescent panel comprising:
a substrate; and
an organic electroluminescent element provided on the substrate,
the organic electroluminescent element being a top emission element that includes, in the order from the substrate side:
an anode;
a light-emitting layer;
an electron transport layer;
a first metal layer;
a p-type oxide layer; and
a transparent cathode, wherein
the top emission element being configured to emit light from the transparent cathode side,
the light-emitting layer and the electron transport layer each being formed from an organic material,
a mixture layer of a p-type oxide and a hole transport material being provided between the electron transport layer and the transparent cathode, and
the mixture layer is provided between the p-type oxide layer and the transparent cathode.

2. The organic electroluminescent panel according to claim 1 ,
wherein the absolute value of a work function of the first metal layer is smaller than the absolute value of a lowest unoccupied molecular orbital energy of the electron transport layer.

3. The organic electroluminescent panel according to claim 1 ,
wherein the second metal layer is provided between the p-type oxide layer and the transparent cathode.

4. The organic electroluminescent panel according to claim 1 ,
wherein the organic electroluminescent element comprises, in the order from the substrate side, a second light-emitting layer, a second electron transport layer, a second metal layer, and a second p-type oxide layer, between the anode and the light-emitting layer.

5. The organic electroluminescent panel according to claim 4 ,
wherein the absolute value of a work function of the second metal layer is smaller than the absolute value of a lowest unoccupied molecular orbital energy of the second electron transport layer.

6. The organic electroluminescent panel according to claim 1 ,
wherein the organic electroluminescent element includes a hole injection layer between the anode and the light-emitting layer, and the mixture layer is made of the same material as a material of the hole injection layer.

7. The organic electroluminescent panel according to claim 1 ,
wherein the mixture layer is a p-doped layer formed by co-deposition of an organic hole injection material and the p-type oxide.

8. The organic electroluminescent panel according to claim 7 ,
wherein the organic hole injection material is α-NPD.

9. The organic electroluminescent panel according to claim 7 ,
wherein the p-type oxide is molybdenum trioxide.

10. The organic electroluminescent panel according to claim 1 ,
wherein the mixture layer is provided between the first metal layer and the p-type oxide layer.

11. The organic electroluminescent panel according to claim 1 ,
wherein the mixture layer is provided between the electron transport layer and the first metal layer.

12. The organic electroluminescent panel according to claim 7 ,
wherein an amount of the p-type oxide in the mixture layer is 10 to 50% by weight.

13. The organic electroluminescent panel according to claim 7 ,
wherein an amount of the p-type oxide in the mixture layer is 15 to 25% by weight.

Assignees

• Sharp Kk

Inventors

• Uchida Hideki
• Tsukamoto Yuto
• Kikuchi Katsuhiro
• Niboshi Manabu
• Isomura Yoshiyuki
• Endo Ayataka
• ITO Asae

Classifications

• H01L51/5072

  Electricity · mapped topic

• H01L2251/308

  Electricity · mapped topic

• H01L51/5234

  Electricity · mapped topic

• H01L51/5088

  Electricity · mapped topic

• H01L51/006

  Electricity · mapped topic