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Proceedings Paper

Novel U-shaped liquid crystals for electro-optic devices
Author(s): Atsushi Yoshizawa; Juri Rokunohe; Shinpei Segawa; Fumitaka Ogasawara
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Paper Abstract

We would like to report here novel molecular design for electro-optic liquid crystal devices, i.e. catechol derivatives for reduction in threshold voltage and binaphthyl derivatives for blue phases with a wide temperature range. A threshold voltage of a nematic mixture consisting of a host liquid crystal and 10wt% of a catechol derivative, 1-{6-(3,4-difluorophenyloxy)hexyloxy}-2-{6-[4-(4-fluorophenyl)phenyloxy]hexyloxy}benzene, was markedly lower than that of the host LC. The U-shaped compound was found to induce larger dielectric anisotropy in the nematic phase of the mixture than the corresponding monomeric compound. Then, we prepared a homologous series of novel chiral dimeric compounds, (R)-2,2'-bis{6-[4-(2-(2-fluoro-4-butyloxyphenyl)pyrimidine-5-yl)phenyloxy]alkyloxy}-1,1'-binaphthyl. The binaphthyl derivatives with an even number of atoms in the spacers showed a chiral nematic phase, however, those with an odd number of atoms showed a blue phase in a relatively wide temperature range between the isotropic and smectic A phases. We discuss structure-property relationships in the U-shaped system.

Paper Details

Date Published: 23 February 2006
PDF: 10 pages
Proc. SPIE 6135, Liquid Crystal Materials, Devices, and Applications XI, 613508 (23 February 2006); doi: 10.1117/12.644405
Show Author Affiliations
Atsushi Yoshizawa, Hirosaki Univ. (Japan)
Juri Rokunohe, Hirosaki Univ. (Japan)
Shinpei Segawa, Hirosaki Univ. (Japan)
Fumitaka Ogasawara, Tohoku Chemical Corp. (Japan)

Published in SPIE Proceedings Vol. 6135:
Liquid Crystal Materials, Devices, and Applications XI
Liang-Chy Chien, Editor(s)

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