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C-Dots dispersed nematic liquid crystal as tunable retarder

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Abstract

In the present work, carbon quantum dot (C-Dots) has been dispersed in a nematic liquid crystal (NLC) in three different concentrations and NLC-QDs composites are prepared. Measurement of birefringence has been done with the help of Phase Modulation technique. Contrast ratio and threshold voltage have also been measured for pristine and doped NLC. Textures of pristine and NLC-QDs composites were studied using POM with exposure time of 100 ms. Dielectric studies of pristine as well as NLC-QDs composites with the variation of temperature and frequency have also been done. From these investigations we have observed an increase in dielectric permittivity and contrast ratio and decrease in birefringence and threshold voltage with the increasing concentration of QDs in LC. The birefringence of the pristine NLC has been measured which is found to be 0.19 which decreases for the NLC-QDs composites. Contrast ratio is also found to be increased with 12.5%, i.e., 97%, and threshold voltage has been decreased up to 0.2 V from 0.8 V for dispersed system. The outcomes of the studies are suitable for the liquid crystal displays and may also be useful in opto-electronic devices which require low birefringence, such as tunable retarder or variable waveplate.

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Data availability

The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors are thankful to APJ Abdul Kalam center for innovation and for providing the required experimental facilities. One of the author Govind Pathak is thankful to CSIR, New Delhi, India (File No. 09/0107(12335)/2021-EMR-I) for financial assistance in the form of Research Associate fellowship. Prof. Rajiv Manohar is thankful to the Science and Engineering Research Board (SERB) for providing the research grant with File No. CRG/2021/006430.

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The authors have not disclosed any funding.

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Authors and Affiliations

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

    Kirtika Yadav, Govind Pathak, Shikha Agarwal, Shivangi Tripathi, Atul Srivastava & Rajiv Manohar

  2. Raman Research Institute, Bangalore, India

    Sandeep Kumar

  3. Department of Chemistry, Nitte Meenakshi Institute of Technology, Bangalore, India

    Sandeep Kumar

Authors
  1. Kirtika Yadav
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  2. Govind Pathak
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  3. Shikha Agarwal
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  4. Shivangi Tripathi
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  5. Sandeep Kumar
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  6. Atul Srivastava
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  7. Rajiv Manohar
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Contributions

KY contributed to writing of the original draft and formal analysis, GP contributed to methodology and visualization, SA contributed to acquisition of data, ST contributed to reviewing and editing of the manuscript, SK contributed to synthesis and characterization of Q-Dots, AS contributed to reviewing of the manuscript and supervision, RM contributed to guidance and resources.

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Correspondence to Rajiv Manohar.

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Yadav, K., Pathak, G., Agarwal, S. et al. C-Dots dispersed nematic liquid crystal as tunable retarder. J Mater Sci: Mater Electron 34, 1978 (2023). https://doi.org/10.1007/s10854-023-11359-w

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  • DOI: https://doi.org/10.1007/s10854-023-11359-w

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