Title

High birefringence phenyl tolane positive compounds for dual frequency liquid crystals

Authors

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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