Conductive polymeric ink composition
AssigneeLG Chem, Ltd.
InventorMi-Kyoung Kim
Life of this patent
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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.
Claims6
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.
Dependencies are inferred from the claim text.