An oblique helicoidal cholesteric ChOH represents a unique optical material with a pitch that can be tuned by an electric or magnetic field in a broad range from sub micrometers to micrometers. In this work, we demonstrate that the oblique helicoidal cholesteric doped with azoxybenzene molecules and stabilized by an electric field could also be tuned by light irradiation. At a fixed voltage, UV irradiation causes a redshift of the reflection peak by more than 200 nm. The demonstrated effect has the potential for applications such as smart windows, sensors, tunable lasers, and filters.
A wide spectra color-reflective device based on polymer-sustained conical helix (PSCH) of cholesteric liquid crystal (CLC) is demonstrated. The phase-separated three-dimensional polymer network transcribes the helicoidal structure of a CLC and sustains the deformation of helices by the external electric field for wide spectrum turning. Besides the selective reflection of light, the device also demonstrates light-scattering focal conic texture in off-state and transparent homeotropic state at high electric field. The new electro-chromic devices with PSCH that can reversibly change of wide-range colors in response to ascending and descending of electric field are promising in various fields including smart windows, sensors, displays, and camouflage applications.
We experimentally demonstrate fast flexoelectro-optic switching in a liquid crystal cell containing bimesogen-doped and polymer-stabilized cholesteric. The device exhibits a response time of less than 0.7 ms and with low hysteresis and color dispersion which is suitable for potential applications including field-sequential color displays.
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