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Color Tuning by Oxide Addition in PEDOT:PSS-Based Electrochromic Devices
Delphin Levasseur1,2, Issam Mjejri3, Thomas Rolland4
1CNRS, Univ. Bordeaux., ICMCB, UMR 5026, Bx INP, F-33600 Pessac, France. d.levasseur@ast-innovations.com.
Polymers
|April 10, 2019
Summary
Poly(3,4-ethylenedioxythiophene) (PEDOT) conducting polymers exhibit excellent electrochromic properties. Mixing PEDOT with iron oxide (Fe₂O₃) tunes the color switch, enabling potential monitoring of the bluish tint.
Area of Science:
- Materials Science
- Polymer Chemistry
- Electrochemistry
Background:
- Conducting polymers, specifically Poly(3,4-ethylenedioxythiophene) (PEDOT) derivatives, are recognized for their significant electrochromic (EC) capabilities.
- These materials offer a reversible color change, typically switching to a blue hue when an electrical voltage is applied.
- The EC performance of devices utilizing these polymers is crucial for applications in smart windows and displays.
Purpose of the Study:
- To characterize the electrochromic performance of PEDOT thin films.
- To investigate the effect of mixing PEDOT with iron oxide (Fe₂O₃) on its electrochromic properties.
- To evaluate the potential for monitoring color changes based on chromaticity parameters.
Main Methods:
- Fabrication of symmetrical EC devices using PEDOT thin films deposited via bar coating from commercial inks.
- Separation of PEDOT films using a lithium-based ionic membrane.
- Characterization of EC performance and color tuning by incorporating varying amounts of Fe₂O₃.
- Evaluation of chromaticity parameters (L*, a*, b*) under different oxidizing/reducing potentials.
Main Results:
- Highest performance was observed for PEDOT films with a thickness of 800 nm.
- Mixing PEDOT with optically inactive iron oxide (Fe₂O₃) resulted in a color switch from dark blue to reddish.
- The intensity of the color switch was dependent on the concentration of Fe₂O₃ incorporated into the PEDOT film.
- Detailed analysis of chromaticity parameters indicated a correlation between potential and the bluish tint intensity.
Conclusions:
- PEDOT derivatives demonstrate robust electrochromic switching behavior.
- Incorporation of Fe₂O₃ offers a method to tune the electrochromic color palette of PEDOT.
- The study suggests the possibility of monitoring the electrochromic state by evaluating chromaticity parameters, paving the way for advanced EC devices.
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