Conductive polymeric ink composition

Patent metadata

Field	Value
Publication number	US-10240057-B2
Application number	US-201515318318-A
Country	US
Kind code	B2
Filing date	May 29, 2015
Priority date	Jun 13, 2014
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

Disclosed is a conductive polymeric ink composition, wherein pH of the ink composition can be adjusted to a desired neutral pH value while maintaining dispersibility of PEDOT:PSS (Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)) used as a main component of the ink composition, thereby solving problems due to strong acidity, including a reduction in the lifetime of devices. Furthermore, a transparent conductive polymer thin film formed from the ink composition has low haze, low surface resistance and high conductivity, compared to thin films manufactured conventionally.

First claim

What is claimed is:

1. A method of preparing a neutralized PEDOT:PSS (Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)) aqueous dispersion, comprising:
a) mixing a PEDOT:PSS aqueous dispersion with an amine compound and an organic solvent that is separated from water, thus neutralizing the PEDOT:PSS aqueous dispersion;
b) separating a mixture obtained in a) into a lower water layer including the neutralized PEDOT:PSS aqueous dispersion and an upper organic layer including the amine compound and the organic solvent;
c) removing the upper organic layer; and
d) washing the water layer separated from the organic layer with an organic solvent to remove the organic layer, yielding the neutralized PEDOT:PSS aqueous dispersion.

2. The method of claim 1 , wherein the amine compound comprises at least one selected from the group consisting of a primary amine compound, a secondary amine compound, a tertiary amine compound, and a pyridine compound.

3. The method of claim 2 , wherein the amine compound comprises at least one selected from the group consisting of triethylamine, 3,5-lutidine, and 2,4,6-trimethylpyridine.

4. The method of claim 1 , wherein the organic solvent is diethyl ether.

5. The method of claim 1 , wherein an amount of the organic solvent in a) is 50 - 500 parts by weight based on 100 parts by weight of the PEDOT:PSS aqueous dispersion.

6. The method of claim 1 , wherein the amine compound in a) is present in an amount so that a concentration thereof in the organic solvent is 0.1 - 50 wt %.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Mi-Kyoung

Classifications

• H01L51/5206

  Electricity · mapped topic

• C09D11/102

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

• H01L51/5203

  Electricity · mapped topic

• H01L51/0021

  Electricity · mapped topic

• Y02E10/549

  Organic PV cells · CPC title