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Influence of composite mixtures between nematic liquid crystal and porous carbon nanoparticles towards photoluminescence and UV absorbance

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Abstract

The optical parameters of the liquid crystalline materials can be tuned by the dispersion of nanoparticles. Concentration of dopant in the host LC material affects its optical properties significantly, which makes the dispersed system suitable for LC-based devices. In the present investigation, we have studied the effect of different concentrations of nanoparticles on the optical properties of LC, as a guest–host system, where PCNP is guest material and NLC is host material. Porous carbon nanoparticles (PCNPs) were dispersed into the nematic liquid crystal (NLC) in three different concentrations. Optical parameters were measured for pure NLC and NLC-PCNP composites. Photoluminescence (PL) study was performed and it was found that the PL intensity increased for the PCNP dispersed system. High photoluminescence has much importance in the luminescent displays. Full width half maxima (FWHM) were also determined by the Gaussian fitting of PL intensity data. UV absorbance was also measured which gets increased for the PCNP dispersed NLC system when compared to pure NLC. Optical bandgap was found to be reduced after the dispersion of PCNP into NLC. Several other parameters such as absorption coefficient and optical density were also determined. The proposed work may be significant for the liquid crystal displays (LCDs) and other devices which require less bandgap materials. This work may also put some light on the effect of dopants on the LC material in the research based on guest–host system. Increasing the photoluminescence and creating less bandgap materials using carbon nanoparticles is a real challenge, and porous nanoparticles used here overcome this challenge.

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Acknowledgements

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. Rajiv Manohar is also thankful to the DST, India for the project and financial help. The authors are also thankful to APJ Abdul Kalam Centre for Innovation for the experimental facilities.

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Authors and Affiliations

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

    Govind Pathak & Rajiv Manohar

  2. Division of Physical Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand

    Thitima Rujiralai

  3. Centre for Advanced Research and Development, CHRIST (Deemed to be University), Hosur Rd, Bengaluru, 560029, India

    Gurumurthy Hegde

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  1. Govind Pathak
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  2. Thitima Rujiralai
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  3. Gurumurthy Hegde
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Correspondence to Rajiv Manohar.

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Pathak, G., Rujiralai, T., Hegde, G. et al. Influence of composite mixtures between nematic liquid crystal and porous carbon nanoparticles towards photoluminescence and UV absorbance. Appl. Phys. A 129, 261 (2023). https://doi.org/10.1007/s00339-023-06550-z

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