Highly birefringent nematic and chiral nematic liquid crystals

Woon, K.L. and O'Neill, M. and Vlachos, P. and Aldred, M.P. and Kelly, S.M. (2005) Highly birefringent nematic and chiral nematic liquid crystals. Liquid Crystals, 32 (9). pp. 1191-1194. ISSN 0267-8292

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Official URL: http://www.tandfonline.com/doi/full/10.1080/026782...

Abstract

We report a simple interference method to determine the dispersion of the extraordinary refractive index and birefringence of highly conjugated and coloured nematic liquid crystals used as light‐emitting materials in organic electroluminescent devices. The measurements are made in the nematic glass phase at room temperature. The birefringence is highly dispersive and values up to 1.1 are obtained. Chiral groups are incorporated into the end chains giving a chiral nematic liquid crystal with a very wide stopband in the visible region. The Berreman matrix method is used to simulate transmission through the chiral nematic liquid crystal cell using the refractive index parameters obtained experimentally. Excellent agreement between theory and experiment is found.

Item Type: Article
Uncontrolled Keywords: Birefringent; Nematic; Chiral; Liquid crystals
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Faculty of Science > Dept of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 27 Feb 2015 02:15
Last Modified: 27 Feb 2015 02:15
URI: http://eprints.um.edu.my/id/eprint/12892

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