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New Design Paradigm for Color Control in Anodically Coloring Electrochromic Molecules
Dylan T Christiansen1, Aimée L Tomlinson2, John R Reynolds1
1School of Chemistry and Biochemistry, School of Materials Science and Engineering, Center for Organic Photonics and Electronics, Georgia Tech Polymer Network , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States.
Journal of the American Chemical Society
|February 23, 2019
Summary
Researchers developed a new method for designing electrochromic molecules using cross-conjugation. This technique allows precise control over color changes, enabling colorless solutions to become vibrant or opaque black upon oxidation.
Area of Science:
- Materials Science
- Organic Chemistry
- Electrochemistry
Background:
- Electrochromic materials change color with applied voltage.
- Tuning electrochromic properties is crucial for advanced applications.
- Existing methods often lack precise control over color and stability.
Purpose of the Study:
- Establish a new design paradigm for anodically coloring electrochromic molecules.
- Demonstrate control over electronic energy levels and color tuning.
- Develop materials for tunable, reversible color changes.
Main Methods:
- Utilized cross-conjugation in molecular design.
- Controlled electronic energy levels of radical cation states independently.
- Manipulated oscillator strengths of radical cation transitions.
Main Results:
- Achieved independent tuning of neutral and radical cation states.
- Shifted λmax of low-energy absorption by over 400 nm.
- Created colorless (UV-absorbing) neutral states and vibrant (green, yellow, red) radical cations.
- Formulated blends transitioning from colorless to opaque black.
Conclusions:
- Cross-conjugation offers a powerful strategy for designing electrochromic molecules.
- Precise color control and tunable absorption spectra are achievable.
- Developed materials show potential for dynamic, opaque black displays and smart windows.
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