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Tuning of birefringence, response time, and dielectric anisotropy by the dispersion of fluorescent dye into the nematic liquid crystal

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Abstract

In this study, fluorescent dye benzo 2,1,3 thiadiazole has been dispersed into the pure nematic liquid crystal (NLC) 2020, which is composed of fluorinated 4′-alkylphenyl-4-isothiocyanatotolanes, in three different concentrations. Electro-optical and dielectric parameters have been investigated in the present work. Birefringence has been calculated by transmittance technique for pure and dye-dispersed system, and found to be increased for dispersed system. This is the key finding of the present investigation. In this work, response time has also been calculated by optical switching method and found to be decreased after the dispersion of fluorescent dye into the pure NLC 2020. Contrast ratio has also been measured here and found to be increased for the dispersed system. Relative permittivity has been found to be decreased after the dispersion of dye. Dielectric anisotropy has also been calculated for pure NLC and dye–NLC dispersed system, and found to be decreased for dispersed system. The present investigation may be helpful in the improvement of response time of liquid crystal-based devices.

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Acknowledgements

The authors are thankful to DST for grant of Indo-Polish Project and UPCST for grant of project. We are also thankful to Dr. Swadesh Kumar Gupta, working at Hong Kong University of Science and Technology and Dr. Satya Prakash Yadav, working at Banaras Hindu University, for informative discussion about experiments.

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Authors and Affiliations

  1. Liquid Crystal Research Lab, Department of Physics, University of Lucknow, Lucknow, 226007, India

    Govind Pathak, Kaushlendra Agrahari, Geeta Yadav, Atul Srivastava & Rajiv Manohar

  2. Liquid Crystal Group, Military University of Technology, S. Kaliskiego 2, 00-908, Warsaw, Poland

    Olga Strzezysz

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  1. Govind Pathak
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Correspondence to Rajiv Manohar.

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Pathak, G., Agrahari, K., Yadav, G. et al. Tuning of birefringence, response time, and dielectric anisotropy by the dispersion of fluorescent dye into the nematic liquid crystal. Appl. Phys. A 124, 463 (2018). https://doi.org/10.1007/s00339-018-1878-9

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