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- Title
Influence of orange azo dichroic dye on morphological, electro-optical, phase transition and absorption behaviour of ZnO nanoparticles-induced homeotropically aligned liquid crystal display cell.
- Authors
Chinky; Malik, Parul; Kumar, Pankaj
- Abstract
In this paper, the influence of orange azo dichroic dye on morphological, electro-optical (EO), phase transition and absorption behavior of zinc oxide (ZnO) nanoparticles (NPs)-induced homeotropically aligned liquid crystal (HALC) cells have been studied. Two sample cells were prepared for experimental analysis. The NPs-induced HALC cell was prepared via doping of optimized concentration (0.3 wt/wt %) of ZnO NPs in negative anisotropic host liquid crystal (LC). Another cell was prepared with the same mixture in addition to doping of a fixed amount of orange azo dichroic dye. Experimental results revealed that the addition of dichroic dye in ZnO NPs-induced HALC cell lessens the threshold and operating voltages compared with pristine HALC cell. Comparatively higher contrast was observed for dye-doped ZnO NPs-induced HALC cell due to presence of the dye molecules which resulted in a slight trivial minute decrease in OFF state transmission. In addition, the phase behavior was also studied for prepared samples and found a shift to slightly higher transition (from nematic to isotropic) temperature for dichroic dye-doped ZnO NPs-induced HALC cell compared with NPs-induced HALC cell. Into the bargain, the order parameter (S) was also evaluated using an empirical relation among phase transition temperature and found in agreement with reported values of S (0.3–0.8) for LCs. Additionally, in analogy with solid like band theory, both cells were explored for measurement of band gap using under UV–Visible irradiations and found reduced value of same on adding the dichroic dye.
- Subjects
PHASE transitions; LIQUID crystal displays; ENERGY-band theory of solids; DYES &; dyeing; ZINC oxide; TRANSITION temperature; AZO dyes
- Publication
Journal of Materials Science: Materials in Electronics, 2023, Vol 34, Issue 36, p1
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-023-11669-z