Photoresponsive cholesteric (Ch) liquid crystals (LCs) showing reflection of visible light were prepared by the addition of chiral molecules and azobenzene molecules in a host nematic LC. The Ch–isotropic phase transition temperature and wavelength of reflected light were controlled by varying the enantiomer excess. Switching between reflection and transparent states was achieved by ultraviolet irradiation. In addition, the switching time was also explored by means of time-resolved measurements.
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Kurihara et al. (1998) studied this question.
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