Tandem organic light-emitting element

Patent metadata

Field	Value
Publication number	US-2017331075-A1
Application number	US-201615541654-A
Country	US
Kind code	A1
Filing date	Jan 5, 2016
Priority date	Jan 5, 2015
Publication date	Nov 16, 2017
Grant date	—

Abstract

The present invention relates to a tandem organic light-emitting element, more particularly to a tandem organic light-emitting element which may decrease a driving voltage in a driving region of a charge generation layer by sequentially laminating an electronics layer, which is doped with a metal dopant, and an electronics layer, which is doped with an organic dopant, on one side of the charge generation layer, thereby having increased power efficiency and life span. To this end, the present invention provides a tandem organic light-emitting element which is characterized by comprising: a base substrate; a first electrode formed on the base substrate; a second electrode formed opposite to the first electrode; two or more organic light-emitting layers, formed between the first electrode and the second electrode, comprising a light-emitting layer, a hole transfer layer formed between the light-emitting layer and the first electrode, and an electronics layer formed between the light-emitting layer and the second electrode; and a charge generation layer formed between the neighboring organic light-emitting layers, wherein the electronics layer formed between the light-emitting layer and the charge generation layer has a multilayer structure, while comprising a first electronics layer doped with a metal dopant and a second electronics layer doped with an organic dopant.

First claim

1 . A tandem organic light-emitting device comprising:
a base substrate; a first electrode disposed on the base substrate; a second electrode facing the first electrode; two or more organic light-emitting layers disposed between the first electrode and the second electrode, the two or more organic light-emitting layers respectively comprising an emissive layer, a hole layer disposed between the emissive layer and the first electrode, and an electron layer disposed between the emissive layer and the second electrode; and one or more charge generation layers respectively disposed between adjacent organic light-emitting layers among the two or more organic light-emitting layers, wherein the electron layer disposed between the emissive layer and a corresponding charge generation layer of the one or more charge generation layers has a multilayer structure and comprises a first electron layer doped with a metal dopant and a second electron layer doped with an organic dopant.

2 . The tandem organic light-emitting device of claim 1 , wherein the first electron layer and the second electron layer are sequentially disposed on the corresponding charge generation layer between the emissive layer and the corresponding charge generation layer.

3 . The tandem organic light-emitting device of claim 2 , wherein the first electron layer and the second electron layer are n-type electron layers.

4 . The tandem organic light-emitting device of claim 3 , wherein the electron layer further comprises a third electron layer disposed between the second electron layer and the emissive layer.

5 . The tandem organic light-emitting device of claim 1 , wherein the hole layer has a multilayer structure comprised of a first hole layer and a second hole layer sequentially disposed on the emissive layer.

6 . The tandem organic light-emitting device of claim 5 , wherein the second hole layer is a p-type hole layer.

7 . The tandem organic light-emitting device of claim 1 , wherein the one or more charge generation layers are formed from hexacyano hexaazatriphenylene (HATCN).

8 . The tandem organic light-emitting device of claim 1 , wherein the two or more organic light-emitting layers include a first organic light-emitting layer disposed on the first electrode, a second organic light-emitting layer disposed on the first organic light-emitting layer, and a third organic light-emitting layer disposed on the second organic light-emitting layer, and
the one or more charge generation layers include a first charge generation layer disposed between the first organic light-emitting layer and the second organic light-emitting layer and a second charge generation layer disposed between the second organic light-emitting layer and the third organic light-emitting layer.

9 . The tandem organic light-emitting device of claim 8 , wherein a total thickness of the first to third organic light-emitting layers and the first and second charge generation layers is about 500 nm or less.

10 . The tandem organic light-emitting device of claim 8 , wherein the emissive layer of the first organic light-emitting layer generates blue light, the emissive layer of the second organic light-emitting layer generates yellow light, and the emissive layer of the third organic light-emitting layer generates red light.

11 . The tandem organic light-emitting device of claim 1 , wherein the base substrate is a flexible substrate.

12 . The tandem organic light-emitting device of claim 11 , wherein the base substrate is a thin glass sheet having a thickness of about 1.5 mm or less.

Assignees

• Corning Prec Materials Co Ltd
• Univ-Industry Cooperation Group Of Kyung Hee Univ
• Univ-Industry Cooperation Group Of Kyung Hee Univ

Inventors

• Lee Hyung Seok
• Woo Kwang Je
• Youn Jang Dae
• Kwon Jang Hyuk
• Son Young Hoon

Classifications

• H01L51/0097

  Electricity · mapped topic

• H01L51/5278 Primary

  Electricity · mapped topic

• H01L51/0072

  Electricity · mapped topic

• H01L2251/5338

  Electricity · mapped topic

• H01L51/5206

  Electricity · mapped topic