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Proceedings Paper

Colorless molecular dopants for low-voltage operation of nematic liquid crystals
Author(s): Joshua N. Haddock; Johanna Schmidtke; Sriram Kumaraswamy; David L. Mathine; Seth R. Marder; Bernard Kippelen
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Paper Abstract

Molecules designed to possess large dipole moments have been synthesized and doped into liquid crystals for the purpose of reducing the threshold voltage associated with the Freedericksz transition in nematics. These molecules were tested in the commercial nematic mixture E7 at varying concentrations and the resultant mixtures were evaluated to determine their nematic-isotropic transition temperature, threshold voltage, dielectric anisotropy, and visco-elastic constant as a function of dopant concentration. We have shown that these materials reduce the threshold voltage by up to 25 % at the 10 wt.% doping level but do so via a reduction of the splay elastic constant, not by the increase of the dielectric anisotropy as was expected. As a consequence of this result these dopants have also shown to increase the response time of the dopant/liquid crystal mixture.

Paper Details

Date Published: 12 December 2002
PDF: 8 pages
Proc. SPIE 4799, Liquid Crystals VI, (12 December 2002); doi: 10.1117/12.453308
Show Author Affiliations
Joshua N. Haddock, Optical Sciences Ctr./Univ. of Arizona (United States)
Johanna Schmidtke, Univ. of Arizona (United States)
Sriram Kumaraswamy, Univ. of Arizona (United States)
David L. Mathine, Optical Sciences Ctr./Univ. of Arizona (United States)
Seth R. Marder, Optical Sciences Ctr./Univ. of Arizona (United States)
Univ. of Arizona (United States)
Bernard Kippelen, Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 4799:
Liquid Crystals VI
Iam-Choon Khoo, Editor(s)

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