INK FOR FUNCTIONAL LAYER FORMATION, METHOD FOR MANUFACTURING LIGHT EMITTING ELEMENT, LIGHT EMITTING DEVICE, AND ELECTRONIC APPARATUS

• US 20150270485A1
• Filed: 03/19/2015
• Published: 09/24/2015
• Est. Priority Date: 03/24/2014
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: WATANABE, Shotaro
• Granted Patent: US 9,653,685 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C09D 11/30 Inkjet printing inks
• CPC Class Codes: C09D 11/36 based on non-aqueous solvents
• CPC Class Codes: C09D 11/52 Electrically conductive inks
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/15 Hole transporting layers
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 71/135 using ink-jet printing
• CPC Class Codes: H10K 71/15 characterised by the solvent used

Abstract

The ink for functional layer formation includes a first component that is a solute; and a second component with a boiling point of 280° C. or higher and 350° C. or lower, is a good solvent, and is at least one type selected from a group consisting of an aromatic hydrocarbon including at least two aromatic rings, aromatic glycol ether, aliphatic glycol ether, aliphatic acetate, and aliphatic ester.

Claims

1. An ink for functional layer formation, comprising:

a first component that is a solute; and

a second component with a boiling point of 280°

C. or higher and 350°

C. or lower, is a good solvent for the first component, and is at least one type selected from a group consisting of an aromatic hydrocarbon including at least two aromatic rings, aromatic glycol ether, aliphatic glycol ether, aliphatic acetate, and aliphatic ester.

2. The ink for functional layer formation according to claim 1, further comprising:

a third component with a boiling point of 200°

C. or higher and 300°

C. or lower, is a good solvent for the first component, and is at least one type selected from a group consisting of an aromatic hydrocarbon, an aromatic ether, and an aliphatic ether,

wherein the proportion of the second component in a mixed solvent including the second component and the third component is 10 wt % or greater.

3. The ink for functional layer formation according to claim 2,

wherein the boiling point of the second component is higher than the boiling point of the third component, and

the difference between the boiling points of the second component and the third component is 50°

C. or higher.

4. The ink for functional layer formation according to claim 1,

wherein the viscosity of the second component is 10 cp or higher and 40 cp or lower.

5. The ink for functional layer formation according to claim 2,

wherein the viscosity of the second component is 10 cp or higher and 40 cp or lower,

and the viscosity of the third component is lower than 10 cp.

6. A method for manufacturing a light emitting element in which a functional layer that includes a light emitting layer is pinched between a pair of electrodes, the method comprising:

forming a partition wall with a liquid repellent surface, which surrounds a film formation region that includes one of the pair of electrodes on a substrate;

coating the ink for functional layer formation according to claim 1 onto the film formation region; and

drying and solidifying the coated ink for functional layer formation,

wherein the first component of the ink for functional layer formation is an organic semiconductor material.

7. A method for manufacturing a light emitting element in which a functional layer that includes a light emitting layer is pinched between a pair of electrodes, the method comprising:

forming a partition wall with a liquid repellent surface, which surrounds a film formation region that includes one of the pair of electrodes on a substrate;

coating the ink for functional layer formation according to claim 2 onto the film formation region; and

drying and solidifying the coated ink for functional layer formation,

wherein the first component of the ink for functional layer formation is an organic semiconductor material.

8. A method for manufacturing a light emitting element in which a functional layer that includes a light emitting layer is pinched between a pair of electrodes, the method comprising:

forming a partition wall with a liquid repellent surface, which surrounds a film formation region that includes one of the pair of electrodes on a substrate;

coating the ink for functional layer formation according to claim 3 onto the film formation region; and

drying and solidifying the coated ink for functional layer formation,

wherein the first component of the ink for functional layer formation is an organic semiconductor material.

9. A method for manufacturing a light emitting element in which a functional layer that includes a light emitting layer is pinched between a pair of electrodes, the method comprising:

forming a partition wall with a liquid repellent surface, which surrounds a film formation region that includes one of the pair of electrodes on a substrate;

coating the ink for functional layer formation according to claim 4 onto the film formation region; and

drying and solidifying the coated ink for functional layer formation,

wherein the first component of the ink for functional layer formation is an organic semiconductor material.

10. A method for manufacturing a light emitting element in which a functional layer that includes a light emitting layer is pinched between a pair of electrodes, the method comprising:

forming a partition wall with a liquid repellent surface, which surrounds a film formation region that includes one of the pair of electrodes on a substrate;

coating the ink for functional layer formation according to claim 5 onto the film formation region; and

drying and solidifying the coated ink for functional layer formation,

wherein the first component of the ink for functional layer formation is an organic semiconductor material.

11. The method for manufacturing a light emitting element according to claim 6,

wherein the first component is a high molecular weight or low molecular weight organic semiconductor material.

12. The method for manufacturing a light emitting element according to claim 6,

wherein the coating includes decompressing and drying.

13. A light emitting device, comprising:

a light emitting element manufactured using the method for manufacturing a light emitting element according to claim 6.

14. A light emitting device, comprising:

a light emitting element manufactured using the method for manufacturing a light emitting element according to claim 7.

15. A light emitting device, comprising:

a light emitting element manufactured using the method for manufacturing a light emitting element according to claim 8.

16. A light emitting device, comprising:

a light emitting element manufactured using the method for manufacturing a light emitting element according to claim 9.

17. A light emitting device, comprising:

a light emitting element manufactured using the method for manufacturing a light emitting element according to claim 10.

18. A light emitting device, comprising:

a light emitting element manufactured using the method for manufacturing a light emitting element according to claim 11.

19. The light emitting device according to claim 13,

wherein the light emitting element is a top emission-type.

20. An electronic apparatus comprising:

the light emitting device according to claim 13.