Diphenyl-diacetylene liquid crystals for electro-optic application

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Abstract
Three diphenyl-diacetylene nematic liquid-crystal homologs were synthesized and two mixtures formulated. Dielectric constant, threshold voltage, splay elastic constant, birefringence, order parameter, and rotational viscosity of these liquid crystals were evaluated at elevated temperatures. These highly conjugated liquid-crystal mixtures are found to exhibit a large birefringence, relatively low viscosity, wide nematic range, and modest dielectric anisotropy. Potential applications of these liquid crystals in high definition displays, infrared spatial light modulators, and high-speed light switches are foreseeable.