Abstract
A new technique for patterning and tuning of electrochromic properties of conductive polymers was used to make dual image displays.
Highlights
Electrochromism refers to the change in a material’s optical properties with the onset of a specific applied electrical stimulus
We have demonstrated that a newly developed UV-light patterning technique can be adapted to accommodate Conductive polymers (CPs) other than PEDOT, such as PPy, with similar effects on the resultant CP film
We further showed that the electrochromic contrast between two redox states can be tuned using UV-light exposure
Summary
Electrochromism refers to the change in a material’s optical properties with the onset of a specific applied electrical stimulus. We investigate the use of UV-light mediated patterning combined with VPP in order to produce high-resolution patterns of PEDOT and PPy with unique electrochromic properties to create an optoelectronic device switching between two images. Thin films of PEDOT or PPy deposited on ITO-coated polyethylene terephthalate (PET) plastic were scratched in the middle to separate the electrodes They were incorporated into the devices using a gel electrolyte doctor bladed onto the films and encapsulated with PET double sided adhesive with a PET top layer. Color contrast measurements were performed on PEDOT and PPy samples in their oxidized and reduced states using a spectrophotometer (Datacolor Mercury). Galvanostatic discharge measurements were performed in the potential range 0–0.5 V at a constant current of 10 mA in order to calculate the film capacitance
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