Method of manufacturing organic EL element, organic EL element, organic EL apparatus, and electronic device

Patent metadata

Field	Value
Publication number	US-9490456-B2
Application number	US-201414474892-A
Country	US
Kind code	B2
Filing date	Sep 2, 2014
Priority date	Sep 3, 2013
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

An organic EL element with a functional layer including at least a hole injection layer, a hole transport layer, and a luminescence layer laminated from a pixel electrode side in order between a pixel electrode as an anode and a counter electrode as a cathode, and a method of manufacturing the organic EL element has a forming process by applying a solution including a low molecular material and a high molecular material to at least one layer among the hole injection layer, the hole transport layer, and luminescence layer, in which the molecular weight of low molecular material is 10,000 or less and the molecular weight of high molecular material is 10,000 to 300,000, and in which a mixing ratio of low molecular material is 10 wt % to 90 wt % with respect to the weight of low molecular material and high molecular material included in the solution.

First claim

What is claimed is:

1. An organic EL element comprising:
an anode;
a cathode; and
a functional layer including at least a hole injection layer, a hole transport layer, and a luminescence layer laminated between the anode and the cathode from the anode side in order,
wherein at least one layer among the hole injection layer, the hole transport layer, and the luminescence layer includes a functional layer forming material,
wherein
the functional layer forming material includes
a low molecular material, and
a high molecular material,

a molecular weight of the low molecular material is 10,000 or less a weight average molecular weight of the high molecular material is from 10,000 to 300,000, and
a mixing ratio of the low molecular material is from 10 wt % to 90 wt % with respect to the weight of the functional layer forming material.

2. The organic EL element according to claim 1 ,
wherein the high molecular material is selected from a polymethylmethacrylate resin, a silicone resin, an urethane resin, a norbornene resin, a fluororesin, a low-density polyethylene resin, a polyester resin, polyparaphenylene vinylene, polyfluorene, polyaniline, polythiophene, or polyvinylcarbazole and a derivative thereof.

3. The organic EL element according to claim 2 ,
wherein when the size of a band gap of the low molecular material is set to Eg1 and the size of a band gap of the high molecular material is set to Eg2, the high molecular material in which the relation Eg1≦Eg2 is satisfied is selected.

4. The organic EL element according to claim 2 ,
wherein, in the functional layer, the high molecular material included in an upper layer laminated on a lower layer is the same type as the high molecular material included in the lower layer.

5. A method of manufacturing an organic EL element having a functional layer including at least a hole injection layer, a hole transport layer, and a luminescence layer laminated between an anode and a cathode from the anode side in order, comprising:
forming at least one layer among the hole injection layer, the hole transport layer, and the luminescence layer by applying a solution including a functional layer forming material,
wherein
the functional layer forming material includes
a low molecular material, and
a high molecular material,

a molecular weight of the low molecular material is 10,000 or less, a weight average molecular weight of the high molecular material is from 10,000 to 300,000, and
a mixing ratio of the low molecular material is from 10 wt % to 90 wt % with respect to a weight of the functional layer forming material.

6. The method of manufacturing an organic EL element according to claim 5 ,
wherein the high molecular material is selected from a polymethylmethacrylate resin, a silicone resin, an urethane resin, a norbornene resin, a fluororesin, a low-density polyethylene resin, a polyester resin, polyparaphenylene vinylene, polyfluorene, polyaniline, polythiophene, or polyvinylcarbazole and a derivative thereof.

7. The method of manufacturing an organic EL element according to claim 6 ,
wherein when the size of a band gap of the low molecular material is set to Eg1 and the size of a band gap of the high molecular material is set to Eg2, the high molecular material in which the relation Eg1≦Eg2 is satisfied is selected.

8. An organic EL apparatus comprising:
an organic EL element manufactured by using the method of manufacturing an organic EL element according to claim 7 .

9. An organic EL apparatus comprising:
an organic EL element manufactured by using the method of manufacturing an organic EL element according to claim 7 .

10. The method of manufacturing an organic EL element according to claim 6 ,
wherein, in the functional layer, the high molecular material included in the solution which is used to form an upper layer laminated on a lower layer is the same type as the high molecular material included in the lower layer.

11. An organic EL apparatus comprising:
an organic EL element manufactured by using the method of manufacturing an organic EL element according to claim 10 .

12. An organic EL apparatus comprising:
an organic EL element manufactured by using the method of manufacturing an organic EL element according to claim 10 .

13. An organic EL apparatus comprising:
an organic EL element manufactured by using the method of manufacturing an organic EL element according to claim 6 .

14. An organic EL apparatus comprising:
an organic EL element manufactured by using the method of manufacturing an organic EL element according to claim 6 .

15. The method of manufacturing an organic EL element according to claim 5 ,
wherein the solution includes a good solvent for dissolving the high molecular material, and
wherein the boiling point of the good solvent is 200° C. or higher.

16. An organic EL apparatus comprising:
an organic EL element manufactured by using the method of manufacturing an organic EL element according to claim 15 .

17. An organic EL apparatus comprising:
an organic EL element manufactured by using the method of manufacturing an organic EL element according to claim 15 .

18. An organic EL apparatus comprising:
an organic EL element manufactured by using the method of manufacturing an organic EL element according to claim 5 .

19. An electronic device comprising:
the organic EL apparatus according to claim 18 .

20. An organic EL apparatus comprising:
an organic EL element manufactured by using the method of manufacturing an organic EL element according to claim 5 .

Assignees

• Seiko Epson Corp

Inventors

• Sago Takumi
• Tanabe Seiichi
• Watanabe Shotaro
• Ishida Kohei

Classifications

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H10K59/35 Primary

  comprising red-green-blue [RGB] subpixels · CPC title

• H01L27/3244

  Electricity · mapped topic

• H01L51/0037

  Electricity · mapped topic

• H01L27/3211

  Electricity · mapped topic