High birefringence phenyl tolane positive compounds for dual frequency liquid crystals

    Authors

    J. Sun; H. Q. Xianyu; S. Gauza;S. T. Wu

    Comments

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    Abstract

    Dual frequency liquid crystals (DFLCs) provide a possibility to achieve sub-millisecond rise and decay times and are useful for various electro-optical devices. In most of DFLC mixtures, ester compounds are utilised in order to obtain a low crossover frequency. However, the ester linking group does not provide electron conjugation so that the DFLC mixtures usually exhibit a limited birefringence (n 0.3 at = 633 nm). For phase modulation a lower birefringence demands a thicker cell gap which, in turn, increases the response time and operating voltage. This problem becomes more severe as the wavelength increases. In this paper, we introduce a series of isothiocyanato phenyl tolane positive compounds with high birefringence and moderate dielectric relaxation frequency. The dielectric and electro-optical properties of these compounds are investigated. We also formulated a DFLC mixture using these new positive compounds which exhibits n = 0.39 at = 633 nm and 0.33 at = 1550 nm.

    Journal Title

    Liquid Crystals

    Volume

    36

    Issue/Number

    12

    Publication Date

    1-1-2009

    Document Type

    Article

    First Page

    1401

    Last Page

    1408

    WOS Identifier

    WOS:000272795900010

    ISSN

    0267-8292

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