Method for manufacturing an OLED device and method for manufacturing an OLED display panel

• US 10,573,813 B2
• Filed: 09/12/2018
• Issued: 02/25/2020
• Est. Priority Date: 03/20/2018
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Hefei Xinsheng Optoelectric Technology Co. Ltd. (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Jia, Wenbin
• Primary Examiner(s): Assouman, Herve-Louis Y
• Application Number:
  US16/129,217
• Publication Number:
  US 20190296239A1
• Time in Patent Office: 531 Days
• Field of Search: None
• CPC Class Codes: H10K 2102/00 Constructional details relating to the organic devices covered by this subclass
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/173 comprising banks or shadow masks
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/135 using ink-jet printing
• CPC Class Codes: H10K 71/15 characterised by the solvent used
• CPC Class Codes: H10K 71/441 in the presence of solvent vapors, e.g. solvent vapour annealing

Abstract

Disclosed are a method for manufacturing an OLED device and an OLED device obtained by the method, and a method for manufacturing a display panel and a display panel obtained by the method, which can solve the problem that the film thickness of an organic functional layer in the existing OLED device is uneven. The method for manufacturing the OLED device includes: forming a pixel defining layer on a substrate and forming accommodating portions in the pixel defining layer; adding ink to the accommodating portions to form an organic functional layer, wherein the ink includes a first organic solvent and a second organic solvent; and the first organic solvent and the second organic solvent have the same kind of lyophilic property or lyophobic property, and the first organic solvent and the second organic solvent have different boiling points and different degrees of lyophilic property or lyophobic property.

Claims

1. An ink for an OLED device, comprising a first organic solvent and a second organic solvent, wherein the first organic solvent and the second organic solvent have a same kind of lyophilic property or lyophobic property, and the first organic solvent and the second organic solvent have different boiling points and different degrees of lyophilic property or lyophobic property;

wherein

when the first organic solvent, the second organic solvent and a portion of a side wall of an accommodating portion close to a substrate all have a lyophilic property, the first organic solvent has a stronger lyophilic property and a higher boiling point than the second organic solvent,

when the first organic solvent and the second organic solvent both have a lyophilic property and the portion of the side wall of the accommodating portion close to the substrate has a lyophobic property, the second organic solvent has a stronger lyophilic property and a higher boiling point than the first organic solvent;

when the first organic solvent and the second organic solvent both have a lyophobic property and the portion of the side wall of the accommodating portion close to the substrate has a lyophilic property, the second organic solvent has a stronger lyophilic property and a higher boiling point than the first organic solvent;

or,

when the first organic solvent, the second organic solvent, and the portion of the side wall of the accommodating portion close to the substrate all have a lyophobic property, the first organic solvent has a stronger lyophilic property and a higher boiling point than the second organic solvent.

2. An OLED device, comprising the substrate, an anode, a pixel defining layer, an organic light emitting functional layer and a cathode, wherein the organic light emitting functional layer is prepared by the ink according to claim 1.

3. The OLED device according to claim 2, wherein the pixel defining layer has a first pixel defining layer close to the substrate and a second pixel defining layer away from the substrate, the first pixel defining layer and the substrate have the same kind of lyophilic property or lyophobic property to the ink for forming pixels, and the second pixel defining layer has a lyophilic property or lyophobic property to the ink for forming the pixels which is opposite to that of the substrate and the first pixel defining layer.

4. An OLED display panel, comprising the OLED device according to claim 2.

5. A method for manufacturing the OLED device according to claim 2, comprising:

forming the pixel defining layer on the substrate and forming accommodating portions in the pixel defining layer;

adding the ink to the accommodating portions to form the organic functional layer of the OLED device.

6. The method for manufacturing the OLED device according to claim 5, wherein

the pixel defining layer comprises a first defining layer and a second defining layer, the portion of the side wall of the accommodating portion close to the substrate is the first defining layer, and a portion of the side wall of the accommodating portion away from the substrate is the second defining layer;

and

the step of forming the pixel defining layer on the substrate and forming accommodating portions in the pixel defining layer includes;

forming the first defining layer and the second defining layer on the substrate successively, and forming a pattern including the accommodating portions penetrating through the first defining layer and the second defining layer by a patterning process, wherein the first defining layer has a lyophilic property and the second defining layer has a lyophobic property.

7. The method for manufacturing the OLED device according to claim 5, wherein the step of adding the ink to the accommodating portions specifically comprises:

adding the ink to the accommodating portions by an inkjet printing process.

8. The method for manufacturing the OLED device according to claim 5, wherein the first organic solvent has a smaller volume in the ink than the second organic solvent.

9. The method for manufacturing the OLED device according to claim 8, wherein a volume ratio of the first organic solvent and the second organic solvent in the ink is 1:

1.5 to 1;

9.

10. The method for manufacturing the OLED device according to claim 5, further comprising a step of forming the organic functional layer with the ink by using a vacuum freeze drying process.

11. The method for manufacturing the OLED device according to claim 10, wherein the step of forming the organic functional layer with the ink by using a vacuum freeze drying process comprises:

adjusting the vacuum degree of a vacuum freeze drying equipment, so that the evaporation speed of the solvent throughout the surface of the ink in the accommodating portions is the same, and thereby drying the ink to form the organic functional layer.

12. The method for manufacturing the OLED device according to claim 5, wherein the ink further includes a solute comprising material for forming the organic functional layer.

13. The method for manufacturing the OLED device according to claim 10, wherein the material of the first defining layer comprises silicon oxide or silicon nitride.

14. The method for manufacturing the OLED device according to claim 6, wherein the material of the second defining layer comprises polymer resin.

15. A method for manufacturing an OLED display panel, comprising the method for manufacturing the OLED device according to claim 5.