Organic light emitting display including color-adjusting layer and manufacturing method thereof

• US 9,871,218 B2
• Filed: 04/27/2015
• Issued: 01/16/2018
• Est. Priority Date: 01/05/2015
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Choi, Sung Jin
• Primary Examiner(s): GORDON, MATTHEW E
• Application Number:
  US14/697,340
• Publication Number:
  US 20160197297A1
• Time in Patent Office: 995 Days
• Field of Search: 257 40
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 50/13 comprising stacked EL layers within one EL unit
• CPC Class Codes: H10K 50/157 between the light-emitting layer and the cathode
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 85/1135 Polyethylene dioxythiophene [PEDOT]; Derivatives thereof

Abstract

Provided are organic light emitting display and manufacturing method of the organic light emitting display. According to an aspect of the present invention, there is provided a organic light emitting display comprising a substrate, a first electrode and a second electrode disposed on the substrate and opposed to each other, at least one organic light emitting layer positioned between the first electrode and the second electrode, and at least one color adjusting layer positioned between the organic light emitting layer and the second electrode.

Claims

1. An organic light emitting display, comprising:

a substrate;

a first electrode and a second electrode disposed on the substrate and opposed to each other;

at least one organic light emitting layer positioned between the first electrode and the second electrode;

wherein the at least one organic light emitting layer includes first and second organic light emitting layers formed to contact each other, the first organic light emitting layer emitting first color light, and the second organic light emitting layer emitting second color light;

at least one color adjusting layer contacting the organic light emitting layer; and

the color adjusting layer is positioned on the first organic light emitting layer or the second organic light emitting layer; and

the color adjusting layer is positioned between the organic light emitting layer and the second electrode; and

an electron transporting layer disposed between the at least one color adjusting layer and the second electrode,

wherein the at least one color adjusting layer contains a first material having a high electron transport capability and a second material having a high hole transport capability.

2. The organic light emitting display of claim 1, wherein the first material has a degree of mobility of electrons higher than a degree of mobility of holes.

3. The organic light emitting display of claim 1, wherein the second material has a degree of mobility of holes higher than a degree of mobility of electrons.

4. The organic light emitting display of claim 1, wherein the first electrode is an anode and the second electrode is a cathode.

5. The organic light emitting display of claim 1, wherein the at least one organic light emitting layer further includes a third organic light emitting layer emitting third color light, and

the third organic light emitting layer is positioned between the second organic light emitting layer and the first electrode.

6. The organic light emitting display of claim 5, wherein the third color light is blue light.

7. The organic light emitting display of claim 5, further comprising:

a charge generating layer positioned between the first and second organic light emitting layers and the third organic light emitting layer.

8. The organic light emitting display of claim 5, wherein one of the at least one color adjusting layer is positioned on the third organic light emitting layer.

9. An organic light emitting display comprising:

a substrate;

a first electrode and a second electrode disposed on the substrate and opposed to each other;

an organic light emitting layer positioned between the first electrode and the second electrode and including at least one first organic light emitting layer emitting first color light, at least one second organic light emitting layer emitting second color light, and at least one third organic light emitting layer emitting third color light;

wherein the third color light is blue light;

the first organic light emitting layer and the second organic light emitting layer are positioned to contact each other;

a color adjusting layer contacting at least one of the first to third organic light emitting layers;

the color adjusting layer is positioned between the first organic light emitting layer and the second electrode; and

an electron transporting layer disposed between the color adjusting layer and the second electrode,

wherein the color adjusting layer contains a first material having a high electron transport capability and a second material having a high hole transport capability.

10. A manufacturing method of an organic light emitting display, comprising:

forming a first electrode on a substrate;

forming at least one organic light emitting layer on the first electrode;

forming a color adjusting layer on the at least one organic light emitting layer;

forming an electron-transporting layer directly on the color adjusting layer; and

forming a second electrode on the electron-transporting layer; and

wherein the color adjusting layer contains a first material having a high electron transport capability and a second material having a high hole transport capability;

wherein the at least one organic light emitting layer includes first and second organic light emitting layers formed to contact each other, the first organic light emitting layer emitting first color light, and the second organic light emitting layer emitting second color light; and

wherein the color adjusting layer is positioned on the first organic light emitting layer or the second organic light emitting layer.

11. The manufacturing method of claim 10, wherein the first material has a degree of mobility of electrons higher than a degree of mobility of holes.

12. The manufacturing method of claim 10, wherein the second material has a degree of mobility of holes higher than a degree of mobility of electrons.

13. The manufacturing method of claim 10, further comprising:

at least one of forming at least one of a hole-injecting layer and a hole-transporting layer supplying holes generated from the first electrode to the organic light emitting layer between the first electrode and the organic light emitting layer; and

forming at least one of an electron-injecting layer and an electron-transporting layer supplying electrons generated from the second electrode to the organic light emitting layer between the second electrode and the organic light emitting layer.

14. An organic light emitting display comprising:

a substrate;

a first electrode and a second electrode disposed on the substrate and opposed to each other;

at least one organic light emitting layer positioned between the first electrode and the second electrode;

at least one color adjusting layer positioned between the organic light emitting layer and the second electrode; and

an electron transporting layer comprising a first surface and a second surface opposing the first surface,

wherein the first surface contacts the second electrode and the second surface contacts the at least one color adjusting layer, and

wherein the at least one color adjusting layer contains a first material having a high electron transport capability and a second material having a high hole transport capability.