ORGANIC LIGHT EMITTING DISPLAY DEVICE AND METHOD FOR MANUFACTURING THE SAME

• US 20100155760A1
• Filed: 12/21/2009
• Published: 06/24/2010
• Est. Priority Date: 12/24/2008
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Jeong, Hyun-Cheol, Park, Jong-Hyun, Lee, Kyung-Hoon, Park, Tae-Han, Yoo, Dong-Hee
• Granted Patent: US 8,384,095 B2
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/191 characterised by provisions for the orientation or alignment of the layer to be deposited
• CPC Class Codes: H10K 71/211 by selective transformation of an existing layer

Abstract

Disclosed are an organic light emitting display device with improved yield and processing efficiency, which includes an interlayer capable of being separated into a hydrophilic region and a hydrophobic region on top of a hole injection layer in an organic light emitting device and a plurality of layers including a light emitting layer and which is fabricated without using a shadow mask, as well as a method for manufacturing the same. The manufacturing method includes preparing a substrate having a plurality of pixel regions defined in a matrix form, arranging an anode in each of the pixel regions, forming a hole injection layer on the anode by the solution process, forming an interlayer with hydrophobic properties on the hole injection layer by a solution process, selectively UV irradiating the interlayer to define a hydrophilic region on the interlayer, forming a light emitting layer on the interlayer by the solution process, and arranging a cathode on the substrate having the light emitting layer.

Claims

1. A method for manufacturing an organic light emitting display device, comprising:

preparing a substrate having a plurality of pixel regions defined in a matrix form;

arranging an anode in each of the pixel regions;

forming a hole injection layer on the anode by a solution process;

forming an interlayer with hydrophobic properties on the hole injection layer by the solution process;

selectively UV irradiating the interlayer to define a hydrophilic region on the interlayer;

forming a light emitting layer on the interlayer by the solution process; and

arranging a cathode on the substrate having the light emitting layer.

2. A method for manufacturing an organic light emitting display device, comprising:

preparing a substrate having a plurality of pixel regions defined in a matrix form;

arranging an anode in each of the pixel regions;

forming a hole injection layer on the anode by a solution process;

forming an interlayer with a water contact angle of 70°

or more and hydrophobic properties on the hole injection layer by the solution process;

selectively UV irradiating the interlayer to enable hydrophilic treatment of the interlayer so as to have a water contact angle of less than 70°

at the UV irradiated portion of the interlayer;

forming a light emitting layer on the interlayer except for the UV irradiated portion; and

arranging a cathode on the substrate having the light emitting layer.

3. The method according to claim 2, wherein the formation of the interlayer comprises dipping the substrate having the anode and the hole injection layer into an interlayer material or, otherwise, applying the interlayer material to the top of the substrate having the anode and the hole injection layer by at least one selected from a group consisting of spin coating, roll printing, slit coating, nozzle coating and ink-jetting.

4. The method according to claim 2, wherein the formation of the light emitting layer comprises dipping the substrate having the anode, the hole injection layer and the interlayer into a light emitting material or, otherwise, applying the light emitting material to the top of the substrate having the anode, the hole injection layer and the interlayer by at least one selected from a group consisting of spin coating, roll printing, slit coating, nozzle coating and ink-jetting.

5. The method according to claim 2, further comprising:

after formation of the light emitting layer, forming an electron transport layer on top of the light emitting layer by at least one selected from a group consisting of dipping, spin coating, nozzle coating, slit coating, roll printing, ink-jetting and evaporation deposition.

6. The method according to claim 2, wherein the interlayer is composed of a material exhibiting UV absorption or photolysis performance.

7. The method according to claim 2, wherein the interlayer contains an organic substance having at least one bond selected from C—

C, C═

N, C═

C, Si—

O, C—

O and C═

O.

8. The method according to claim 7, wherein the interlayer contains at least one selected from a group consisting of imide, amine, silane, carbonate, ester, acetate, sulfonate, nitrate, ketone, fluorine, oxetane and epoxy.

9. The method according to claim 8, wherein the interlayer contains triphenylamine.

10. The method according to claim 2, wherein the UV irradiation is performed at a wavelength of about 150 to about 260 nm.

11. The method according to claim 2, wherein a pressure of the UV irradiation ranges from about 1×

10<sup>−

5</sup> torr to about 800 torr.

12. A method for manufacturing an organic light emitting display device, comprising:

preparing a substrate having a plurality of pixel regions defined in a matrix form;

arranging an anode in each of the pixel regions;

forming a hole injection layer on the anode by a solution process;

forming an interlayer with hydrophobic properties on the hole injection layer by the solution process;

selectively UV irradiating the interlayer to pattern the same;

forming a light emitting layer on the patterned interlayer by the solution process; and

arranging a cathode on the substrate having the light emitting layer.

13. The method according to claim 12, wherein the formation of the interlayer comprises dipping the substrate having the anode and the hole injection layer into an interlayer material or, otherwise, applying the interlayer material to the top of the substrate having the anode and the hole injection layer by at least one selected from a group consisting of spin coating, roll printing, nozzle coating, slit coating and ink-jetting.

14. The method according to claim 12, wherein the formation of the light emitting layer comprises dipping the substrate having the anode, the hole injection layer and the interlayer into a light emitting material or, otherwise, applying the light emitting material to the top of the substrate having the anode, the hole injection layer and the interlayer by at least one selected from a group consisting of spin coating, roll printing, nozzle coating, slit coating and ink-jetting.

15. The method according to claim 12, further comprising:

before or after formation of the light emitting layer, forming an electron transport layer on top of the light emitting layer by at least one selected from a group consisting of dipping, spin coating, nozzle coating, roll printing, slit coating and ink-jetting.

16. The method according to claim 12, wherein the interlayer is composed of a material exhibiting UV absorption or photolysis performance.

17. The method according to claim 12, wherein the interlayer contains an organic substance having at least one bond selected from C—

C, C═

N, C═

C, Si—

O, C—

O and C═

O.

18. The method according to claim 17, wherein the interlayer contains at least one selected from a group consisting of imide, amine, silane, carbonate, ester, acetate, sulfonate, nitrate, ketone, fluorine, oxetane and epoxy.

19. The method according to claim 18, wherein the interlayer contains triphenylamine.

20. The method according to claim 12, wherein the UV irradiation is performed at a wavelength of about 150 to about 260 nm under a pressure of from about 1×

10<sup>−

5</sup> torr to about 800 torr.

21. An organic light emitting display device, comprising:

a substrate having a plurality of pixel regions defined in a matrix form;

an anode arranged in each of the pixel regions;

a hole injection layer formed on the anode;

an interlayer with hydrophobic properties formed on the hole injection layer by a solution process, wherein the interlayer comprises a hydrophobic region and a hydrophilic region separated therein by UV irradiation;

a light emitting layer and an electron transport layer formed on the hydrophobic interlayer; and

a cathode arranged on the electron transport layer.