Electrothermal Color Tuning of Cholesteric Liquid Crystals Using Interdigitated Electrode Patterns

Arne A.F. Froyen, Michael Wübbenhorst, Danqing Liu (Corresponding author), Albert P.H.J. Schenning (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

A transparent color-tunable device is presented based on an electrothermal response by using interdigitated electrode patterns. The response is generated by applying an in-plane AC electric field that heats up a thermosensitive cholesteric liquid crystal mixture. The induced temperature elevations cause band gap shifting (Δλ > 350 nm) up until a colorless state is reached, corresponding to the isotropic phase. Color shifting can be tuned manually by varying the electric field or autonomously by the surrounding temperature. Broadband dielectric spectroscopy reveals that the electrothermal response originates from resistive heating of the transparent electrode pattern in conjunction with the cell capacitance and is therefore largely dependent on the electrode configuration. Hence, the electrothermal response can be easily modified by changing the electrode pattern, frequency and/or voltage, dependent on the user's requirements. Therefore, the ability of this technique to manipulate the autonomous thermal response by an electric field, using only one conductive substrate, shows promise in the field of optoelectronics, sensors, and smart windows.

Original languageEnglish
Article number2000958
Number of pages7
JournalAdvanced Electronic Materials
VolumeXX
Issue numberXX
DOIs
Publication statusAccepted/In press - 18 Dec 2020

Keywords

  • cholesteric liquid crystals
  • dielectric relaxation
  • electrothermal response
  • interdigitated electrode patterns
  • stimuli-responsive materials

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