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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
Published on: February 27, 2019
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Light-directing chiral liquid crystal nanostructures: from 1D to 3D
1Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University , Kent, Ohio 44242, United States.
Accounts of Chemical Research
|September 3, 2014
Summary
Researchers developed light-driven chiral molecular switches to control self-organized liquid crystal (LC) superstructures. These photoresponsive materials enable dynamic tuning of photonic properties for advanced displays and optical devices.
Area of Science:
- Materials Science
- Nanotechnology
- Photochemistry
Background:
- Controlling self-organized molecular superstructures with external stimuli is crucial for nanofabrication.
- Photoresponsive liquid crystals (LCs), including cholesteric LCs (CLCs) and blue phases (BPs), offer tunable photonic properties.
- Achiral LC hosts doped with chiral molecular switches enable the creation of stimuli-responsive materials.
Purpose of the Study:
- To design and synthesize novel light-driven chiral molecular switches with high helical twisting power (HTP).
- To enable dynamic, remote control over the self-organization and optical properties of LC superstructures.
- To explore applications in advanced photonic materials and devices.
Main Methods:
- Rational design and synthesis of light-driven chiral molecular switches based on azobenzene, dithienylcyclopentene, and spirooxazine derivatives.
- Doping achiral LC hosts with synthesized molecular switches to create photoresponsive CLCs and BPs.
- Characterization of photomodulation of helical pitch, helix inversion, and photonic band gaps using various light sources (UV, visible, NIR).
Main Results:
- Achieved wide phototunability of HTP with small amounts of molecular switches, enabling reflection colors across the visible spectrum.
- Demonstrated photoaddressable displays on flexible substrates and NIR-light-induced RGB reflections.
- Fabricated photoresponsive CLC microshells for tunable lasing and investigated dynamic phototuning of LC BPs.
Conclusions:
- Light-driven chiral molecular switches provide effective remote control over LC superstructures.
- Photoresponsive CLCs and BPs are versatile multifunctional photonic materials with significant technological potential.
- This work paves the way for advanced optical devices, smart materials, and energy-saving technologies.
