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Dielectric anisotropy, and diffraction efficiency properties of a doped nematic liquid crystal
- Authors
- Yakuphanoglu, F.; Okutan, M.; Koysal, O.; Ahn, S.-M.; Keum, S. R.
- Issue Date
- 2008
- Publisher
- ELSEVIER SCI LTD
- Keywords
- liquid crystal; SPCI-C7; dielectric anisotropy
- Citation
- DYES AND PIGMENTS, v.76, no.3, pp.721 - 725
- Indexed
- SCIE
SCOPUS
- Journal Title
- DYES AND PIGMENTS
- Volume
- 76
- Number
- 3
- Start Page
- 721
- End Page
- 725
- ISSN
- 0143-7208
- Abstract
- The dielectric anisotropy and diffraction efficiency properties of E7 liquid crystal and SPCI-C7 doped liquid crystal composite have been investigated. The dielectric constant components (epsilon(parallel to) and epsilon(perpendicular to)) in the nematic phase of E7 were measured as a function of frequency. The liquid crystals exhibited dielectrically-control led positive dielectric anisotropy (p-type Delta epsilon) with transition to negative dielectric anisotropy (n-type Delta epsilon). SPCI-C7 doping lowered dielectric anisotropy and increased the diffraction efficiency of ET The refractive index modulation values of E7 and E7/SPCI-C7 were Delta n = 3.9 x 10(-3) and Delta n = 6.95 x 10(-3), respectively, and this parameter was increased by doping. (c) 2007 Elsevier Ltd. All rights reserved.
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