Guest-host mode ferroelectric liquid crystals
The addition of dichroic dye molecules into a pure ferroelectric liquid crystal (FLC) matrix often results in an improvement in the various properties of the pure FLC, particularly optical contrast and viewing angle. During the last few years many authors have studied such systems. However, the addition of a dye to the FLC matrix is not always beneficial, and there are certain constraints which hinder the use of these systems for industrial applications. In the present study the vital properties of a number of dye-doped FLC systems have been investigated. It has been noticed that all their parameters are strongly dependent on the concentration of dye. Improvements are observed up to a certain concentration of dye but above this level the dye is found to have an adverse effect. In this article an attempt is made to explain this unusual behaviour on the basis of the experimental findings.
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Document Type: Research Article
Affiliations: Physics Department, University of Lucknow, Lucknow, India
Publication date: 01 February 2011