Dispersion of fluorescent dye in the nematic liquid crystal: Enhanced photoluminescence and high birefringence

Pathak, Govind; Agrahari, Kaushlendra; Roy, Aradhana; Srivastava, Atul; Strzeżysz, Olga; Garbat, K.; Manohar, Rajiv

doi:10.1016/j.opelre.2018.10.003

Cited by 12 publications

(2 citation statements)

References 34 publications

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“…Thus, the distance between the domains increases and the dipole-dipole interactions decrease. For this reason, ɛ′ low for E7+1.0 wt.% Rubrene than for E7+0.5 wt.% Rubrene [36].…”

Section: Methodsmentioning

confidence: 90%

The Role of Rubrene Concentration on Dielectric Parameters of Nematic Liquid Crystal

KOCAKÜLAH

2023

Hittite Journal of Science and Engineering

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In this study, the dielectric parameters of E7 coded nematic liquid crystal (NLC) composites containing the different amounts of rubrene fluorescent dye were investigated. E7, E7+0.5 wt.% Rubrene, and E7+1.0 wt.% Rubrene samples were prepared. Frequency dependent dielectric constants (ɛ′ and ɛ′′), dielectric anisotropy (Δε′), and ac conductivity (σac) graphs of rubrene doped E7 NLC composites were obtained by dielectric spectroscopy method and compared with pure E7 NLC. By using these graphs, relaxation frequency (fR), relaxation time (τR), dielectric strength (δɛ′), and crossover frequency (fc) parameters of the E7 NLC and its rubrene doped composites were determined. An increase in fR from 3.045 MHz to 3.697 MHz for 0 V and from 627 kHz to 686 kHz for 40 V was observed with increasing rubrene concentration. On the other hand, a decrease in τR from 0.052 μs to 0.043 μs for 0 V and from 0.254 μs to 0.232 μs for 40 V was seen with increasing rubrene concentration. Furthermore, an increase in fc from 1.145 MHz to 1.298 MHz was obtained with increasing rubrene concentration. The results show that the dielectric parameters change with the concentration of rubrene and it is thought that this study will provide a basis for investigating the dielectric properties of rubrene doped NLC composites. Moreover, it is concluded that the produced composites are a suitable base material for electro-optical device applications such as smart displays, photonics and electrical circuit elements.

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“…Thus, the distance between the domains increases and the dipole-dipole interactions decrease. For this reason, ɛ′ low for E7+1.0 wt.% Rubrene than for E7+0.5 wt.% Rubrene [36].…”

Section: Methodsmentioning

confidence: 90%

The Role of Rubrene Concentration on Dielectric Parameters of Nematic Liquid Crystal

KOCAKÜLAH

2023

Hittite Journal of Science and Engineering

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“…This type of specification includes the determination of display parameters obtained from the color information and luminance of the novel materials. There are several spectroscopic and experimental methods to measure the color information and luminance of the LCs [13][14][15]. In previous work, LC texture were utilized to calculate desired display parameters.…”

Section: Introductionmentioning

confidence: 99%

Influence of silver and gold nano particles on luminance properties of n-hexyloxy-cynobiphenyl liquid crystal through image analysis

Roopa¹,

Subhan²,

Fakruddin³

et al. 2021

Nanosystems: Phys. Chem. Math.

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In this work, gold and silver nanoparticles are separately dispersed in n-hexyloxy-cyanobiphenyl (6O.CB) liquid crystal in the ratio 1:100. The optical textures of pure and nano-dispersed compounds are recorded by using polarizing optical microscope. Differential scanning calorimeter (DSC) is used to compute enthalpy and transition temperature values. Due to the dispersion of nanoparticles, the clearing temperature of the compounds are slightly reduced but there is no significant change in the nematic phase exhibited by pure 6O.CB. Further characterization is done by various spectroscopic techniques like scanning electron microscopy (SEM) and X-ray diffraction (XRD). The optical textures have been analyzed using MATLAB software for the evaluation of display parameters viz., Luminance, Luminance coefficient, Luminance uniformity and Contrast ratio.

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Electro-Optical, Dielectric and Morphological Properties of a Cholesteric Liquid Crystal Light Shutter: The Influence of Azo Dye and Quantum Dot Nanoparticles

Kocakülah

Köysal

2022

J. Electron. Mater.

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Dispersion of fluorescent dye in the nematic liquid crystal: Enhanced photoluminescence and high birefringence

Cited by 12 publications

References 34 publications

The Role of Rubrene Concentration on Dielectric Parameters of Nematic Liquid Crystal

The Role of Rubrene Concentration on Dielectric Parameters of Nematic Liquid Crystal

Influence of silver and gold nano particles on luminance properties of n-hexyloxy-cynobiphenyl liquid crystal through image analysis

Electro-Optical, Dielectric and Morphological Properties of a Cholesteric Liquid Crystal Light Shutter: The Influence of Azo Dye and Quantum Dot Nanoparticles

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