Dielectric anisotropy, and diffraction efficiency properties of a doped nematic liquid crystal

Yakuphanoglu F., Okutan M., Koysal O., Ahn S., Keum S. R.

DYES AND PIGMENTS, vol.76, pp.721-725, 2008 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 76
  • Publication Date: 2008
  • Doi Number: 10.1016/j.dyepig.2007.01.017
  • Journal Name: DYES AND PIGMENTS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.721-725
  • Yıldız Technical University Affiliated: No


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.