White organic light emitting diode device

Patent metadata

Field	Value
Publication number	US-9281487-B2
Application number	US-201414339168-A
Country	US
Kind code	B2
Filing date	Jul 23, 2014
Priority date	Jul 31, 2013
Publication date	Mar 8, 2016
Grant date	Mar 8, 2016

Abstract

Provided is a white organic light emitting diode device, including first and second electrodes facing each other above a substrate, first and second charge generation layers formed between the first electrode and the second electrode, a first stack disposed between the first electrode and the first charge generation layer and including a first light emitting layer, a second stack disposed between the first charge generation layer and the second charge generation layer and including a second light emitting layer, and a third stack disposed between the second charge generation layer and the second electrode and including a third light emitting layer, wherein two of the first to third light emitting layers emit a blue light and the rest light emitting layer emits a yellow-green light.

First claim

What is claimed is:

1. A white organic light emitting diode device, comprising:
first and second electrodes facing each other above a substrate;
first and second charge generation layers formed between the first electrode and the second electrode;
a first stack disposed between the first electrode and the first charge generation layer and including a first light emitting layer;
a second stack disposed between the first charge generation layer and the second charge generation layer and including a second light emitting layer; and
a third stack disposed between the second charge generation layer and the second electrode and including a third light emitting layer,
wherein two of the first to third light emitting layers emit a blue light and the remaining light emitting layer emits a yellow-green light, and
wherein at least one of the second light emitting layer and the third light emitting layer has a two-layer structure.

2. The white organic light emitting diode device of claim 1 , wherein at least one of the first charge generation layer and the second charge generation layer has a junction structure of an N-type charge generation layer and a P-type charge generation layer.

3. The white organic light emitting diode device of claim 1 , wherein the first light emitting layer is a blue fluorescent layer.

4. The white organic light emitting diode device of claim 1 , wherein the first to third light emitting layers have a structure in which two dopants are mixed with one host and two dopants are mixed with two hosts.

5. The white organic light emitting diode device of claim 4 , wherein in the two hosts, one is an electron transportive host and the other is a hole transportive host.

6. The white organic light emitting diode device of claim 1 , wherein the distance between the first electrode and the second electrode is 2500 to 5000 Å.

7. The white organic light emitting diode device of claim 6 , wherein the distance between the second electrode and the second light emitting layer is 2000 Å or greater.

8. The white organic light emitting diode device of claim 1 , wherein at least one of the two light emitting layers emitting a blue light further includes a light emitting layer emitting a red light.

9. The white organic light emitting diode device of claim 1 , wherein each layer of the two-layer structure has a thickness of 400 Å or smaller.

10. The white organic light emitting diode device of claim 1 , wherein the two-layer structure includes a yellow-green light emitting layer and a green light emitting layer.

11. A white organic light emitting diode device, comprising:
first and second electrodes facing each other above a substrate;
first and second charge generation layers formed between the first electrode and the second electrode;
a first stack disposed between the first electrode and the first charge generation layer and including a first light emitting layer;
a second stack disposed between the first charge generation layer and the second charge generation layer and including a second light emitting layer; and
a third stack disposed between the second charge generation layer and the second electrode and including a third light emitting layer,
wherein two of the first to third light emitting layers emit a blue light and the remaining light emitting layer emits a yellow-green light, and
wherein the first to third stacks each further include a hole transport layer and an electron blocking layer.

12. The white organic light emitting diode device of claim 11 , wherein the hole transport layer and the electron blocking layer are formed as a single layer.

13. A white organic light emitting diode device, comprising:
first and second electrodes facing each other above a substrate;
first and second charge generation layers formed between the first electrode and the second electrode;
a first stack disposed between the first electrode and the first charge generation layer and including a first light emitting layer;
a second stack disposed between the first charge generation layer and the second charge generation layer and including a second light emitting layer; and
a third stack disposed between the second charge generation layer and the second electrode and including a third light emitting layer,
wherein two of the first to third light emitting layers emit a blue light and the remaining light emitting layer emits a yellow-green light, and
wherein the third stack further includes an electron transport layer disposed between the third light emitting layer and the second electrode and adjoining the third light emitting layer, the electron transport layer containing an electron injection material mixed with a hole blocking material.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Shinhan
• Ahn Byungchul
• Han Changwook
• Kim Dohyung
• Choi Hongseok
• Pieh Sunghoon
• Tak Yoonheung
• Seo Jeongdae
• Jung Youngkwan
• Cho Gwijeong
• Kam Younseok
• Kim Taeshick

Classifications

• H01L51/5044

  Electricity · mapped topic

• H01L2251/5376

  Electricity · mapped topic

• H01L51/504

  Electricity · mapped topic

• H01L27/3209

  Electricity · mapped topic

• H01L51/5004 Primary

  Electricity · mapped topic