Journal
LIQUID CRYSTALS
Volume 47, Issue 11, Pages 1638-1654Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2020.1754939
Keywords
Ferroelectric liquid crystal; quantum dots; electro-optical response; fluorescence quenching; dsc; polarised optical microscopy
Funding
- UDSMM, ULCO
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Cd0.15Zn0.85S/ZnS core/shell quantum dots (CSQDs) of size 7.54 +/- 0.99 nm in diameter were prepared via gram-scale one-pot synthesis method and dispersed in a ferroelectric liquid crystalline (FLC) material into two different concentrations. Spectroscopic, electro-optical (E-O) and morphological characterisations of aforementioned composites have been carried out. CSQDs cause a significant contraction in the width of chiral smectic C (SmC*) mesophase that has also been theoretically verified. Diffusion-controlled processes are responsible for the fluorescence quenching in the FLC/CSQDs composites which has been explained by using the Stern-Volmer quenching equation. The mesomorphic investigation has revealed that helical deformation takes place in the FLC/CSQDs composites, due to which the temperature-dependent gradual growth of ferroelectric domains is noticed. The perturbed helical geometry evinces a new structure-property correlation having a molecular switching time of 135 mu s that is 51% faster response as compared to the pristine system. Resultant spontaneous polarisation in the matrix of FLC/CSQDs composites is diminished because of the induced homeotropic and flexoelectric contributions. The faster E-O response and optical imaging are the fascinating features of the FLC/CSQDs composites that can probably be utilised in gadget displays.
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