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Chiroptical Switching of Electrochromic Polymer Thin Films
Inho Song1, Liyan You1, Ke Chen1
1Department of Chemistry, Purdue University, West Lafayette, IN, 47907, USA.
Advanced Materials (Deerfield Beach, Fla.)
|October 28, 2023
Summary
Researchers developed novel chiral electrochromic polymers that exhibit tunable chiroptical properties under electrochemical control. These materials enable advanced applications in 3D imaging and information encryption through controlled light polarization.
Area of Science:
- Materials Science
- Polymer Chemistry
- Optoelectronics
Background:
- Chiroptical polymers are vital for chiroptics, spintronics, and chiral-spin selectivity.
- Existing dissymmetric polymer films lack exploration of chiroptical activity under electrochemical switching.
Purpose of the Study:
- To report homogeneous chiral electrochromics using chiral assembly of conjugated polymers.
- To investigate the tunable chiroptical activities under electrochemical control.
Main Methods:
- Chiral assembly of conjugated polymers via transient solidification with molecular chiral templates.
- Tuning chiroptical properties by adjusting the doping level of electrochemically active polymer films.
Main Results:
- Achieved remarkably dissymmetric polarization-dependent transmittance in the neutral state.
- Observed reversed chiroptical activities and bleaching under high oxidation levels, forming monosignate CD spectra.
- Demonstrated tunable circular dichroism and dissymmetric transmission.
Conclusions:
- Chiral electrochromic polymers offer tunable chiroptical properties and reversed activities upon redox reactions.
- Proof-of-concept devices for 3D imaging and information encryption were demonstrated.
- This work lays the foundation for on-chip fabrication of circular polarization-multiplexed displays.
