Advanced Functional Materials · 2009 · 155 citations · 43 references
Natural SciencesChemistryPhysicsOptical MaterialsPolymer ChemistrySpectroscopyCrystal ChemistryCrystal SymmetryCrystalline MaterialsLiquid Crystal MaterialsLiquid CrystalsSupramolecular MaterialsChiral OpticsCholesteric Liquid CrystalsCholesteric PhaseLight IntensityLight Intensity ControlSpectral Absorption PropertiesSpectral Radiative PropertiesStabilization
Abstract Phototuning of more than 2000 nm is demonstrated in an azobenzene‐based cholesteric liquid crystal (azo‐CLC) consisting of a high‐helical‐twisting‐power, axially chiral bis(azo) molecule (QL76). Phototuning range and rate are compared as a function of chiral dopant concentration, light intensity, and thickness. CLCs composed of QL76 maintain the CLC phase regardless of intensity or duration of exposure. The time necessary for the complete restoration of the original spectral properties (position, bandwidth, baseline transmission, and reflectivity) of QL76‐based CLC is dramatically reduced from days to a few minutes by polymer stabilization of the CLC helix.
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Reflective Liquid-Crystal Displays
Tatsuo Uchida, Takahiro Ishinabe · MRS Bulletin · 2002 · 431 citations