Spectroscopic notes of Methyl Red (MR) dye

El-Mansy, M.A.M.; Yahia, I.S.

doi:10.1016/j.saa.2014.03.113

Cited by 14 publications

(2 citation statements)

References 11 publications

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“…The reason behind rise time being greater than the fall time in dye-blended LC systems and the cause of a large decrement in fall time as compared to rise time can be understood with the help of an estimated model presented in Figure 7 and described as nematic LCs, being anisotropic organic compounds comprising rod-like molecules, possess a preferable orientation. The guest dye molecules are also rod-shaped and behave as dipoles that tend to align with the LC director with the dipole moment of 7.2 D. 43 The photoresponsive nature and external stimuli-controlled dynamic behavior of LC host translates to similarly strong response of dye-LC composites.…”

Section: Resultsmentioning

confidence: 99%

Inquisitive Optical and Electro-Optical Attributes of Azo-Dye Dispersed Nematic Liquid Crystal for Applications in Wavelength-Tunable Optical Filters

Agarwal,

Singh,

Tripathi

et al. 2023

J. Phys. Chem. C

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The requirement of selecting a desired wavelength channel from a number of available wavelengths is of great research interest for application in advanced light-wave systems encompassing high-density wavelength-division multiplexed networks. Currently, available devices generally require a high power and complex instrumentation. In the present work, the performance parameters of a novel functional composite material have been augmented for wavelength selection purposes to meet the limitations of the existing technologies. The active material comprises commercially available nematic LC (E204) dispersed with optimized concentration of an organic azo-dye (methyl red crystals). A prototype of a LC-based optical filter has been fabricated, which tends to exhibit superior enhancement in the tunability range of transmitted wavelength and intensity of incident light with voltage control while operating at around 34% lower threshold voltage and a much faster (∼86.63%) response rate. The astounding features of this study include lowering of rise time and fall time of the optimized material composition by around 71.03 and 89.94%, respectively. The fabricated device structure serves as a potential candidate to be employed as a tunable filter. The spectral response shifts toward shorter-wavelength on strengthening the applied electric field across it, as confirmed by the transmission spectroscopic outcomes as well as polarized optical micrographs. Thermal stability of the device was observed to be enhanced for the system having higher concentrations of guest dye. Additionally, the system exhibits modulated photoluminescence emission and notable charge-storage capability with approximately 43% enhancement in capacitance that shall be further explored for future technologies based on energy harvesting purposes.

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Section: Resultsmentioning

confidence: 99%

Inquisitive Optical and Electro-Optical Attributes of Azo-Dye Dispersed Nematic Liquid Crystal for Applications in Wavelength-Tunable Optical Filters

Agarwal,

Singh,

Tripathi

et al. 2023

J. Phys. Chem. C

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“…The selection of functional conjunction was based on previous investigations. 34,35 The convergence threshold parameters were set as follows: 2.0 Â 10 À5 Hartree for the energy and 5.0 Â 10 À3 Angstrom for the displacement. These values were set to obtain the highest convergence.…”

Section: Computational Detailsmentioning

confidence: 99%