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<p>This paper presents the optical and order parameter studies of a mixture of liquid crystalline (LC) materials, such as p–n-undecyloxy benzoic acid (11OBA), including the incorporation of zinc oxide (ZnO) nanoparticles (NPs) at different weight concentrations (0.5–2 wt.%). Studies, including optical absorption, photoluminescence (PL), birefringence, refractive indices, and order parameters, were undertaken on the prepared samples. A prominent absorption peak was observed approximately at 235 nm for both the pure and nano-dispersed liquid crystal samples. The PL spectra exhibit two distinct peaks, located at 367 and 618 nm, whereas ZnO NPs dispersed 11OBA showed a single peak at 392 nm. The peak observed at 367 nm is attributed to near-band-edge emission of free excitons, whereas the peak at 618 nm is indicative of deep-level emission, resulting from point defects such as vacancies and interstitials within the bandgap. The order of parameter values are also calculated for the mixture of the 11OBA LC compound dispersed with ZnO NPs using different models like Kuczynksi, Haller extrapolation, effective geometry, and Vuks at a stabilized nematic region in the visible range at 460-, 500-, 570-, and 635-nm wavelengths.</p>

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Effect of ZnO Nanoparticles Dispersed in p–n-Undecyloxy Benzoic Acid Liquid Crystalline Compounds: Optical and Order Parameter Studies

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • P. Jayaprada,
  • R. K. N. R. Manepalli,
  • K. Koteswara Rao,
  • M. C. Rao,
  • T. Satyanarayana,
  • Y. Subbareddy,
  • N. Usha Rani,
  • Ravindranadh Koutavarapu,
  • M. Tanooj Kumar

摘要

This paper presents the optical and order parameter studies of a mixture of liquid crystalline (LC) materials, such as p–n-undecyloxy benzoic acid (11OBA), including the incorporation of zinc oxide (ZnO) nanoparticles (NPs) at different weight concentrations (0.5–2 wt.%). Studies, including optical absorption, photoluminescence (PL), birefringence, refractive indices, and order parameters, were undertaken on the prepared samples. A prominent absorption peak was observed approximately at 235 nm for both the pure and nano-dispersed liquid crystal samples. The PL spectra exhibit two distinct peaks, located at 367 and 618 nm, whereas ZnO NPs dispersed 11OBA showed a single peak at 392 nm. The peak observed at 367 nm is attributed to near-band-edge emission of free excitons, whereas the peak at 618 nm is indicative of deep-level emission, resulting from point defects such as vacancies and interstitials within the bandgap. The order of parameter values are also calculated for the mixture of the 11OBA LC compound dispersed with ZnO NPs using different models like Kuczynksi, Haller extrapolation, effective geometry, and Vuks at a stabilized nematic region in the visible range at 460-, 500-, 570-, and 635-nm wavelengths.