New-Generation Liquid Crystal Materials for Application in Infrared Region

Harmata, Piotr; Herman, Jakub

doi:10.3390/ma14102616

Cited by 10 publications

(4 citation statements)

References 73 publications

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“…Saccone et al suggested that on changing the degree of fluorination, the fine tuning of temperature is possible over a mesomorphic range [23]. Phillips and Pombeiro, and others have reported that the addition of halogen atom in a drug molecule may increase its liophilicity and also the addition of halogen atom induces strong dipole moment within the liquid crystal and these results in the enhancement of lattice stability [24][25][26][27]. This also increases the ionic radius of the molecule and makes it more parallel in the alignment within an electrode [28].…”

Section: Introductionmentioning

confidence: 99%

A theoretical investigation of nonlinear optical and electronic molecular parameters of hexabutyloxytryphenylene and halogenated hexabutyloxytryphenylene molecules using density functional theory (DFT) for nonlinear device applications

Pal¹,

Mishra²,

Singh³

et al. 2022

Phys. Scr.

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In this work, we discuss the molecular properties of hexabutyloxytryphenylene (HAT4) and halogenated HAT4 using density functional theory (DFT) with B3LYP method and Pople basis set (6-31G, 6-31G*, 6-31G**) for the generation of non-linear optical and electronic parameters. Using DFT method, the dependence of electro-optical parameters of halogenated HAT4 such as dipole moment, mean polarizability, anisotropy in polarizability and hyperpolarizability along with global parameters such as ionization potential, electron affinity, electronegativity, chemical hardness and electrophilicity index on the halogens in the core of the considered molecules has been studied in this work. Further, the frontier molecular orbital analysis for pure HAT4 and halogenated HAT4 molecules has been carried out. The proposed study helps us to analyse the effect of halogenation on the linear, non-linear as well as thermodynanical properties of HAT4 molecules such as HOMO-LUMO gap, thermal energy, entropy and specific heat capacity. The effect of halogenation also leads to understand the modification of nonlinear parameters of HAT4 for the interaction of nonlinear fields.

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Section: Introductionmentioning

confidence: 99%

A theoretical investigation of nonlinear optical and electronic molecular parameters of hexabutyloxytryphenylene and halogenated hexabutyloxytryphenylene molecules using density functional theory (DFT) for nonlinear device applications

Pal¹,

Mishra²,

Singh³

et al. 2022

Phys. Scr.

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“…The intense peak at 1230 cm –1 represents the stretching vibration from the C–O bonds in the ester and ether functional groups. Similarly, the presence of a fluorine atom in the CQD has been evidenced by the strong C–F stretching vibrations in the range 1015 to 1150 cm –1 . ,− All these observations confirm CQDs with an sp 2 -hybridized aromatic nucleus bearing abundant ester, ether, alkyl, and hydroxyl functional groups, which explains the organophilic nature of CQDs . This also might account for its high compatibility in different LCs.…”

Section: Resultsmentioning

confidence: 66%

Electrically Switchable Anisometric Carbon Quantum Dots Exhibiting Linearly Polarized Photoluminescence: Syntheses, Anisotropic Properties, and Facile Control of Uniaxial Orientation

et al. 2022

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Carbon quantum dots (CQDs) have been extensively explored in diverse fields because of their exceptional features. The nanometric particles with photoluminescence (PL) benefit various optical and photonic applications. However, the majority of previous reports have mainly focused on either unpolarized or circular-polarized (CP) PL. Linearly polarized (LP) emission of CQDs is limited mainly because of their isometric shape and difficulties in macroscopic orientation control. Herein, we report syntheses of anisometric CQDs and facile control of the uniaxial orientation on a macroscopic scale, which results in linearly polarized photoluminescence (LP-PL). The anisometric CQDs are synthesized from rigid-rod-shaped precursors and evenly dispersed in the rod-like liquid crystal (LC) host. As-synthesized CQDs exhibit a PL quantum yield as high as 35% in chloroform. In addition to uniform alignment, facile directional switching of the elongated CQD is established by employing the electrical responsiveness of the CQD and host LC. Therefore, the dichroic photophysical properties of anisometric CQDs have been beneficially adopted for fabrications of polarization-sensitive and electrically switchable PL devices. Also, anisometric CQDs are embedded in polymer films with molecular orientational patterns and clearly recognized by LP-PL.

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“…Other applications requiring this property are lower frequencies of the electromagnetic spectrum (from infrared down to THz and GHz), as the optical phase shift produced by the LC is directly proportional to its birefringence and the working frequency. For example, they have been proposed as active medium in metamaterials and metasurfaces 5 , 6 , THz 7 – 9 , GHz 10 , 11 and infrared devices 12 .…”

Section: Introductionmentioning

confidence: 99%

A high birefringence liquid crystal for lenses with large aperture

Bennis

Jankowski

Strzeżysz

et al. 2022

Sci Rep

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This work presents the application of an experimental nematic liquid crystal (LC) mixture (1929) in a large aperture lens. The LC material is composed of terphenyl and biphenyl derivatives compounds with an isothiocyanate terminal group and fluorinated lateral substituents. The substitution with a strongly polar isothiocyanate group and an aromatic rigid core provides $$\pi$$ π -electron coupling, providing high birefringence ($$\Delta n = 0.3375$$ Δ n = 0.3375 at 636 nm and 23 °C) and low viscosity ($$\eta$$ η = 17.03 mPa s). In addition, it also shows high values of birefringence at near infrared (0.318 at 1550 nm). The synthesis process is simple when comparing materials with high melting temperatures. The excellent properties of this LC mixture are demonstrated in a large aperture LC-tunable lens based on a transmission electrode structure. Thanks to the particular characteristics of this mixture, the optical power is high. The high birefringence makes this LC of specific interest for lenses and optical phase modulators and devices, both in the visible and infrared regions.

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New-Generation Liquid Crystal Materials for Application in Infrared Region

Cited by 10 publications

References 73 publications

A theoretical investigation of nonlinear optical and electronic molecular parameters of hexabutyloxytryphenylene and halogenated hexabutyloxytryphenylene molecules using density functional theory (DFT) for nonlinear device applications

A theoretical investigation of nonlinear optical and electronic molecular parameters of hexabutyloxytryphenylene and halogenated hexabutyloxytryphenylene molecules using density functional theory (DFT) for nonlinear device applications

Electrically Switchable Anisometric Carbon Quantum Dots Exhibiting Linearly Polarized Photoluminescence: Syntheses, Anisotropic Properties, and Facile Control of Uniaxial Orientation

A high birefringence liquid crystal for lenses with large aperture

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