Effect of polymer concentration on the electro-optical, dielectric and photoluminescence properties of confined ferroelectric liquid crystals composites. Issue 14 (14th November 2022)

• Record Type: Journal Article
• Authors: Malik, Praveen; Chauhan, Garima; Kumar, Pankaj; Deep, Akash
• Is Part Of: Liquid crystals. Volume 49:Issue 14(2022)
• Page Start: 2008
• Page End: 2018
• Publication Date: 2022-11-14
• Subjects: Ferroelectric liquid crystals -- polymer -- spontaneous polarisation -- response time -- rotational viscosity; Liquid crystals -- Periodicals; 548.905
• DOI: 10.1080/02678292.2022.2094006
• Languages: English
• ISSNs: 0267-8292

Abstract

ABSTRACT: In this work, the effect of polymer concentration (1%, 3% and 5% wt./wt.) on the physical properties of polymer-stabilised ferroelectric liquid crystal composite is presented. The applied voltage and temperature effects have been investigated on electro-optical and dielectric parameters. The concentration of polymer reduces the spontaneous polarisation up to 34.04% at 5% polymer-stabilised ferroelectric liquid crystal composites. At higher concentration, the rotational viscosity also increased by 26.26% but reduced the dielectric strength by 62.8%. The relaxation frequency shifted towards the higher frequency side from 248.183 to 323.52 Hz. A fluorescence study reveals that the emission peak is observed at a wavelength of 424 nm and concentration quenching is observed with 3% and 5% polymer-stabilised ferroelectric liquid crystal composites. The present work also provides information about the interaction mechanism between polymer and ferroelectric liquid crystal molecules. GRAPHICAL ABSTRACT: uf0001 Highlights: We have prepared polymer-stabilised ferroelectric liquid crystal composites. Optical study suggests that the higher concentration (3 wt.% and 5 wt.%) of polymer distorted the helical nature of FLC. Dielectric study reveals the shifting of relaxation frequency towards higher frequency side. The PL spectroscopy shows the phenomena of concentration quenching at 3 wt.% and 5 wt.% of polymer in FLC.