Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Effect of Doping Cd1-xZnxS/ZnS Core/Shell Quantum Dot in Negative Dielectric Anisotropy Nematic Liquid Crystal p-methoxybenzylidene p-decylaniline

Version 1 : Received: 13 March 2021 / Approved: 15 March 2021 / Online: 15 March 2021 (13:41:41 CET)

How to cite: Rastogi, A.; Pandey, F.; Manohar, R.; Singh, S. Effect of Doping Cd1-xZnxS/ZnS Core/Shell Quantum Dot in Negative Dielectric Anisotropy Nematic Liquid Crystal p-methoxybenzylidene p-decylaniline. Preprints 2021, 2021030386 (doi: 10.20944/preprints202103.0386.v1). Rastogi, A.; Pandey, F.; Manohar, R.; Singh, S. Effect of Doping Cd1-xZnxS/ZnS Core/Shell Quantum Dot in Negative Dielectric Anisotropy Nematic Liquid Crystal p-methoxybenzylidene p-decylaniline. Preprints 2021, 2021030386 (doi: 10.20944/preprints202103.0386.v1).

Abstract

We report the effect of doping Cd1-xZnxS/ZnS core/shell quantum dot (CSQDs) in nematic liquid crystal p-methoxybenzylidene p-decylaniline (MBDA) at 0.05 wt/wt%, 0.1 wt/wt%, 0.15 wt/wt%, 0.2 wt/wt%, 0.25 wt/wt% and 0.3 wt/wt% concentrations of CSQDs in MBDA. Dielectric parameters with and without bias with respect to frequency has been investigated. The change in electro - optical parameters with temperature has also been demonstrated. The increase in the mean dielectric permittivity has been found due to large dipole moment of CSQDs which impose stronger interactions with the liquid crystal molecules. The dielectric anisotropy changes sign on doping CSQDs in MBDA liquid crystal. It was concluded that the CSQDs doping noticeably increases the dielectric permittivity of nematic MBDA in the presence of electric field. The doping of CSQDs in nematic MBDA liquid crystal reduces the ion screening effect effectively. This phenomenon is attributed to the competition between the generated ionic impurities during assembling process and the ion trapping effect of the CSQDs. The rotational viscosity of nematic liquid crystal decreases with increasing concentration of the CSQDs with faster response time observed for 0.05 wt/wt% concentration. The birefringence of the doped system increases with the inclusion of CSQDs in MBDA. These results find application in the field of display devices, phase shifters, industries and projectors.

Subject Areas

Nematic liquid crystal MBDA; core/shell QDs (CSQDs); Dielectric, electro optical parameters; photonic displays

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