Electro-optic effects in novel siloxane containing oligomeric liquid crystals II: smectic C materials

Harry J. Coles; Hywel Owen; Joanna Newton; Philip Hodge

doi:10.1117/12.207507

24 April 1995 Electro-optic effects in novel siloxane containing oligomeric liquid crystals II: smectic C materials

Harry J. Coles, Hywel Owen, Joanna Newton, Philip Hodge

Proceedings Volume 2408, Liquid Crystal Materials, Devices, and Displays; (1995) https://doi.org/10.1117/12.207507
Event: IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1995, San Jose, CA, United States

Abstract

A novel series of siloxane containing low molar mass liquid crystals have been synthesized and characterized by DSC, optical microscopy and electro-optic properties. The compounds described all exhibited room temperature bistable chiral smectic C phases. In this paper we concentrate on the electro-optic properties of both low (approximately 20 nC cm^-2) and high (approximately 150 nC. cm^-2) spontaneous polarization homologues. Data is also presented on tilt angles, response times and rotational viscosities for these compounds. All of the materials gave wide temperature range (> 50 degree(s)C) ferroelectric phases with tilt angles, varying between 28 degree(s) and 36 degree(s), that were independent of temperature. Response times of the order of microseconds, or longer, were observed. Dichroic dye guest-host mixtures were prepared and their unusual electro-optic properties leading to high contrast ratios also are described. The implications for both birefringence and dichroism based devices are considered.

Citation Download Citation

Harry J. Coles, Hywel Owen, Joanna Newton, and Philip Hodge "Electro-optic effects in novel siloxane containing oligomeric liquid crystals II: smectic C materials", Proc. SPIE 2408, Liquid Crystal Materials, Devices, and Displays, (24 April 1995); https://doi.org/10.1117/12.207507

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