Organic light-emitting device

Patent metadata

Field	Value
Publication number	US-9343509-B2
Application number	US-201113309486-A
Country	US
Kind code	B2
Filing date	Dec 1, 2011
Priority date	May 23, 2011
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

Provided is an organic light-emitting device including a plurality of pixels, each including a first sub-pixel, a second sub-pixel, and a third sub-pixel having different colors from each other. Each of the pixels includes a substrate, a first electrode layer on the substrate, a first light-emitting layer disposed on the first electrode in the first, second and third sub-pixels, an auxiliary layer disposed on the first light-emitting layer in the second and third sub-pixels, a second light-emitting layer disposed on the auxiliary layer in the second sub-pixel, a third light-emitting layer disposed on the auxiliary layer in the third sub-pixel, and a second electrode layer on the first, second, and third light-emitting layers.

First claim

What is claimed is:

1. An organic light-emitting device comprising:
a plurality of pixels, each pixel comprising a first sub-pixel, a second sub-pixel, and a third sub-pixel having different colors from each other,
wherein each of the pixels comprises:
a substrate;
a first electrode layer on the substrate;
a first light-emitting layer disposed on the first electrode layer in the first, second, and third sub-pixels and formed as a common layer to an entire surface of the first, second, and third sub-pixels;
an auxiliary layer disposed on the first light-emitting layer in the second and third sub-pixels and not being formed in the first sub-pixel;
a second light-emitting layer disposed on the auxiliary layer in the second sub-pixel;
a third light-emitting layer disposed on the auxiliary layer in the third sub-pixel; and
a second electrode layer disposed on the first, second, and third light-emitting layers.

2. The organic light-emitting device of claim 1 , wherein the auxiliary layer comprises a hole injection material and a hole transport material.

3. The organic light-emitting device of claim 1 , wherein the auxiliary layer comprises: a first auxiliary layer including a hole injection material; and
a second auxiliary layer on the first auxiliary layer and including a hole transport material.

4. The organic light-emitting device of claim 1 , wherein the auxiliary layer has a concentration gradient in which the concentration of a hole injection material is greater than a concentration of a hole transport material in a lower portion of the auxiliary layer, and in which the concentration of a hole transport material is greater than a concentration of a hole injection material in an upper portion of the auxiliary layer.

5. The organic light-emitting device of any one claim of claim 2 , wherein the hole injection material comprises a phthalocyanine compound, m-MTDATA, TDATA, 2T-NATA, NPB, PEDOT/PSS, Pani/DBSA, Pani/CSA, or PANI/PSS, and the hole transport material comprises N-phenylcarbazole, polyvinylcarbazole, TPD, α-NPD, or TCTA.

6. The organic light-emitting device of claim 1 , wherein the auxiliary layer comprises a p-type dopant.

7. The organic light-emitting device of claim 6 , wherein the p-type dopant comprises tetracyanoquinodimethane (TCNQ), 2,3,5,6-tetrafluoro-tetracyano-1,4-benzoquinodimethane (F4TCNQ), or 1,3,2-dioxaborine.

8. The organic light-emitting device of claim 1 , wherein the first electrode layer is an anode, and the second electrode layer is a cathode.

9. The organic light-emitting device of claim 1 , wherein the first light-emitting layer is a blue light-emitting layer, the second light-emitting layer is a red light-emitting layer, and the third light-emitting layer is a green light-emitting layer.

10. The organic light-emitting device of claim 1 , further comprising:
a hole injection layer between the first electrode layer and the first light-emitting layer; and
a hole transport layer on the hole injection layer.

11. The organic light-emitting device of claim 1 , further comprising:
an electron transport layer between the second electrode layer and the first, second, and third light-emitting layers; and
an electron injection layer on the electron transport layer.

12. An organic light-emitting device comprising:
a plurality of pixels, each pixel comprising a first sub-pixel, a second sub-pixel, and a third sub-pixel having different colors from each other,
wherein each of the pixels comprises:
a substrate;
a first electrode layer on the substrate;
a first light-emitting layer disposed on the first electrode layer, in the first, second, and third sub-pixels and formed as a common layer to an entire surface of the first, second, and third sub-pixels;
an auxiliary layer disposed on the first light-emitting layer, in the second sub-pixel and the third sub-pixel and not being formed in the first sub-pixel;
a second light-emitting layer disposed on the auxiliary layer, in the second sub-pixel;
a third light-emitting layer disposed on the first light-emitting layer, the auxiliary layer, and the second light-emitting layer, in the first, second, and third sub-pixels; and
a second electrode layer disposed on the third light-emitting layer.

13. The organic light-emitting device of claim 12 , wherein the third light-emitting layer has an electron transport characteristic.

14. The organic light-emitting device of claim 12 , wherein the first light-emitting layer is a blue light-emitting layer, the second light-emitting layer is a red light-emitting layer, and the third light-emitting layer is a green light-emitting layer.

15. The organic light-emitting device of claim 12 , wherein the first light-emitting layer is a blue light-emitting layer, the second light-emitting layer is a green light-emitting layer, and the third light-emitting layer is a red light-emitting layer.

16. The organic light-emitting device of claim 12 , wherein the auxiliary layer comprises:
a first auxiliary layer including a hole injection material; and
a second auxiliary layer on the first auxiliary layer and including a hole transport material.

17. The organic light-emitting device of claim 12 , wherein the auxiliary layer comprises a p-type dopant.

18. The organic light-emitting device of claim 12 , wherein the first electrode layer is an anode, and the second electrode layer is a cathode.

19. The organic light-emitting device of claim 12 , further comprising:
a hole injection layer between the first electrode layer and the first light-emitting layer; and
a hole transport layer on the hole injection layer.

20. The organic light-emitting device of claim 12 , further comprising:
an electron transport layer between the second electrode layer and the first, second, and third light-emitting layers; and
an electron injection layer on the electron transport layer.

Assignees

• Kim Myeong-Suk
• Song Won-Jun
• Choi Byoung-Ki
• Samsung Display Co Ltd

Inventors

• Kim Myeong-Suk
• Song Won-Jun
• Choi Byoung-Ki

Classifications

• H05B33/22

  characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers · CPC title

• C09K11/06

  containing organic luminescent materials · CPC title

• H01L51/506

  Electricity · mapped topic

• H01L51/5056

  Electricity · mapped topic

• H01L51/5088

  Electricity · mapped topic