125337-31-7Relevant articles and documents
Polymer-stabilized bistable dual-frequency cholesteric liquid crystal devices assisted by a predesigned chiral dopant
Chen, Hung-Yi,Hung, Yi-Hua,Liu, Chun-Yen,Tu, Chia-Min,Wu, Guan-Yi,Yen, Chi-Feng
supporting information, p. 16672 - 16681 (2021/12/13)
Liquid crystals have great potential for developing photonic devices that control the optical behaviors of liquid crystals in smart devices with external stimulation. In this study, we have demonstrated a series of bistable cholesteric liquid crystal devices using the dual-frequency nematic liquid crystal HEF951 assisted by a predesigned chiral ferroelectric liquid crystal. The synthesized chiral ferroelectric liquid crystal was used to induce the formation of the cholesteric liquid crystal phase and decrease the driving voltages and response times of the fabricated bistable liquid crystal devices. The fabricated ferroelectric liquid crystal-assisted bistable cholesteric liquid crystal devices showed a stable opaque focal conic state and stable transparent planar state without any energy consumption once they were turned "from focal-conic to planar"and "from planar to focal-conic". To enhance the reliability, the fabricated bistable cholesteric liquid crystal devices were further stabilized by polymer matrixes. Switching of the bistable liquid crystal cells from one state to another was achieved by a one-step voltage bias with various frequencies. Furthermore, the response time of the sample cell was calculated as 1.7 ms. These results suggest that fabricated ferroelectric liquid crystal-assisted bistable cholesteric liquid crystal devices can be applied to produce energy-saving green liquid crystal displays and other related smart devices.
Reactive mesogen and liquid crystal composition including the same
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Page/Page column 70, (2019/07/19)
Provided are a reactive mesogen that may improve display quality of a liquid crystal display, and a liquid crystal composition including the same. The reactive mesogen is represented by the following Formula: where A1, A2, and A3 are each independently a substituted or unsubstituted divalent hydrocarbon ring, or a substituted or unsubstituted divalent heterocycle, L1 and L2 are each independently a direct linkage, —O—, —S—, —CO—, —COO—, —OCOO—, —O(CH2)k1—, —S(CH2)k1—, —O(CF2)k1—, —S(CF2)k1—, —(CH2)k1—, —CF2CH2—, —(CF2)k1—, —CH═CH—, —CF═CF—, —C≡C—, —CH═CH—COO—, or —(CH2)k1—COO—(CH2)k2—O—, Z1 and Z2 are each independently a direct linkage, —O—, —S—, —CO—, —COO—, —OCOO—, —O(CH2)m1—, —S(CH2)m1—, —O(CF2)m1—, —S(CF2)m1—, —(CH2)m1—, —CF2CH2—, —(CF2)m1—, —CH═CH—, —CF═CF—, —C≡C—, —CH═CH—COO—, —(CH2)m1—COO—, —(CH2)m1—COO—(CH2)m2—O—, —CH—(Sp—Pa)—, —CH2CH—(Sp—Pa)—, or —(CH—(Sp—Pa)—CH—(Sp—Pa))—, Pa is a polymerizable group, B is an unsubstituted heterocycle, a substituted or unsubstituted crown ether group, or wherein T1 and T2 are each independently —OH, —CH3, —CF3, —CHF2, —CH2F, —CH2Br, —CHBr2, —CHCl2, or —CH2Cl.
Fabrication and characterization of imprinted photonic crystalline polymer matrices via multiple UV polymerizations
Chien, Chih-Chieh,Liu, Jui-Hsiang,Emelyanenko, A. V.
supporting information, p. 22446 - 22451,6 (2020/09/15)
A photonic polymer network was imprinted using multiple UV-induced polymerizations in the presence of cholesteric liquid crystals (CLCs). Here, the imprinted polymer matrices provided a chiral environment due to the chirality of the polymer networks. The fabricated cell exhibited Bragg reflections even in the absence of anisotropic materials. Moreover, a phototunable liquid crystal cell was fabricated with photosensitive liquid crystalline ethyl 4-[4-(11-acryloyloxy undecyloxy) phenyl azobenzoyl-oxyl] benzoate. The tuning properties of the cells were examined as a function of the irradiation time and concentration of the photosensitive material. Both the tuning rate and dark relaxation of E-Z photoisomerization of the embedded LCs in the polymer network were also examined.
