Ink composition for organic semiconductor device and organic semiconductor device including the same

Patent metadata

Field	Value
Publication number	US-2018248122-A1
Application number	US-201615754149-A
Country	US
Kind code	A1
Filing date	Aug 18, 2016
Priority date	Aug 24, 2015
Publication date	Aug 30, 2018
Grant date	—

Abstract

A leveling agent is oriented in the surface part of a layer formed from a coated film having the oriented leveling agent on its surface. The purpose of the present invention is to provide an ink composition for organic semiconductor device that can form a satisfactory film even on a low surface energy layer. The ink composition for organic semiconductor device contains a first organic semiconductor device material, a leveling agent, a first solvent, and an aromatic solvent. The leveling agent is a polymer at least containing a siloxane monomer as a monomer unit, and the first solvent has a surface tension of 25 mN/m or less.

First claim

1 . An ink composition for organic semiconductor device comprising a first organic semiconductor device material, a leveling agent, a first solvent, and an aromatic solvent, wherein
the leveling agent is a polymer at least containing a siloxane monomer as a monomer unit; and the first solvent has a surface tension of 25 mN/m or less.

2 . The ink composition for organic semiconductor device according to claim 1 , wherein the leveling agent further contains an aromatic group-containing monomer as a monomer unit.

3 . The ink composition for organic semiconductor device according to claim 1 , wherein the leveling agent includes a block copolymer.

4 . The ink composition for organic semiconductor device according to claim 1 , wherein a silicon content rate of the leveling agent is 10 mass % or more.

5 . The ink composition for organic semiconductor device according to claim 1 , wherein the first solvent has a surface tension of less than 23 mN/m.

6 . The ink composition for organic semiconductor device according to claim 1 , wherein the aromatic solvent has a surface tension of less than 36 mN/m.

7 . The ink composition for organic semiconductor device according to claim 1 , wherein
a solvent surface energy A represented by Expression (1):

A
=

(

E
1

×

W
1

W
1

+

W
2

)

+

(

E
2

×

W
2

W
1

+

W
2

)

(
1
)

(where, E 1 represents the surface tension of the first solvent, W 1 represents the mass of the first solvent, E 2 represents the surface tension of the aromatic solvent, and W 2 represents the mass of the aromatic solvent)
is less than 30.

8 . The ink composition for organic semiconductor device according to claim 1 , wherein the first organic semiconductor device material is a hole transport material.

9 . The ink composition for organic semiconductor device according to claim 1 , wherein the organic semiconductor is an organic light-emitting device.

10 . An organic semiconductor device comprising:
a second layer containing a second organic semiconductor device material; and a first layer containing a first organic semiconductor device material and a leveling agent and disposed right above the second layer, wherein the second layer has a surface energy of 28 mN/m or less; and the leveling agent is a polymer at least containing a siloxane monomer as a monomer unit.

11 . The organic semiconductor device according to claim 10 , wherein the first organic semiconductor device material is a hole transport material.

12 . The organic semiconductor device according to claim 11 , wherein the organic semiconductor device is an organic light-emitting device.

Assignees

• Dainippon Ink & Chemicals

Inventors

• Otsuki Eiji
• GOTOU Yuusaku

Classifications

• H01L51/0043 Primary

  Electricity · mapped topic

• H01L51/5056

  Electricity · mapped topic

• H01L51/0094

  Electricity · mapped topic

• C09D11/30

  Inkjet printing inks · CPC title

• C09D11/102 Primary

  containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds · CPC title