Wide range room temperature ferroelectric liquid crystal mixture with microsecond order switching

Debnath, Asim; Mandal, Pradip

doi:10.1016/j.molliq.2016.06.001

Cited by 13 publications

(2 citation statements)

References 23 publications

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“…Not only that, one of the dopant at lower concentration (10 wt%) produced an electroclinic mixture with large field-induced tilt and very small layer contraction [18] and at much higher concentration (75 wt%), it formed a wide range ferroelectric mixture with a few hundred micro-second switching time [19]. Also, a different fluorinated chiral dopant with an oligomethylene spacer was found to produce a ferroelectric mixture with much faster response time [20]. Even a binary mixture of one protonated oligomethylene spacer based chiral compound and one achiral biphenyl pyrimidine compound was found to exhibit room temperature ferroelectric mixture with moderate spontaneous polarization and sub-millisecond switching time [21].…”

Section: Opm and Dsc Studymentioning

confidence: 97%

Effect of non-mesogenic chiral terphenylate on the formulation of room temperature ferroelectric liquid crystal mixtures suitable for display applications

Debnath

Mandal

Sarma

et al. 2019

Journal of Molecular Liquids

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By varying the concentration of a chiral terphenylate dopant in a four-component achiral phenyl pyrimidine-based host mixture we have formulated six ferroelectric liquid crystal mixtures. Though the dopant is nonmesogenic it is observed that only 2wt% of it induces polarity in the host mixture at 32 o C. With increasing concentration, the mixtures show ferroelectric behaviour even below ambient temperature down to at least 12°C. Optical polarizing microscopy, differential scanning calorimetry, dielectric and electrooptic studies reveal that with respect to temperature range, phase sequence, spontaneous polarization, optical tilt angle and switching time the formulated mixtures are suitable for ferroelectric based liquid crystal displays.

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Section: Opm and Dsc Studymentioning

confidence: 97%

Effect of non-mesogenic chiral terphenylate on the formulation of room temperature ferroelectric liquid crystal mixtures suitable for display applications

Debnath

Mandal

Sarma

et al. 2019

Journal of Molecular Liquids

Self Cite

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show abstract

“…Temperature is inversely proportional to spontaneous polarization, and thus the maximum value of P S was achieved at the lowest temperature. This effect is ascribed to the fact that the mobility of the liquid crystals was higher near the phase transition point and that the liquid crystals became closer during cooling, which increased PS when the dipole aligned into the same direction . For 4b, the largest spontaneous polarization was observed to be 126 nC cm −2 at 30 °C.…”

Section: Flc Propertiesmentioning

confidence: 98%

Synthesis of Predesigned Ferroelectric Liquid Crystals and Their Applications in Field‐Sequential Color Displays

Zhang

Liu

Emelyanenko

et al. 2018

Adv Funct Materials

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A series of low transition temperature and fast response chiral smectic C (SmC*) liquid crystals is designed and synthesized. The phase transition behaviors and electrooptical properties of the synthesized compounds are investigated and compared with reported values. The ferroelectric phase of the liquid crystals is characterized by means of differential scanning calorimetry, polarizing optical microscopy, wide-angle X-ray scattering (WAXS), and electrooptical measurements. The wide SmC* phase is achieved via the induction of achiral trisiloxane and a chiral methyl-lateral substituent onto the terminuses of the molecules. The optimized packing arrangement model is studied based on the exceptionally high apparent tilt angles (≈41°) and smectic layer spacing observed using WAXS. A fast response time of 0.3 ms in an electric field of 10 V µm −1 provides an opportunity to use the synthesized materials for field-sequential color liquid crystal displays (FSCLCDs). An FSCLCD sample cell is fabricated using the synthesized ferroelectric liquid crystals via a red (R), green (G), and blue (B) backlight. A color-frame frequency of more than 500 Hz (i.e., a frame frequency more than 166 Hz) is achieved. As a single material liquid crystal display cell, the synthesized ferroelectric liquid crystals show great performances at room temperature.

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Formulation of a binary eutectic antiferroelectric liquid crystal mixture: Comparison of dielectric and electro-optic properties with the pure compounds

Dey¹,

Mandal

2017

Journal of Molecular Liquids

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Wide range room temperature ferroelectric liquid crystal mixture with microsecond order switching

Cited by 13 publications

References 23 publications

Effect of non-mesogenic chiral terphenylate on the formulation of room temperature ferroelectric liquid crystal mixtures suitable for display applications

Effect of non-mesogenic chiral terphenylate on the formulation of room temperature ferroelectric liquid crystal mixtures suitable for display applications

Synthesis of Predesigned Ferroelectric Liquid Crystals and Their Applications in Field‐Sequential Color Displays

Formulation of a binary eutectic antiferroelectric liquid crystal mixture: Comparison of dielectric and electro-optic properties with the pure compounds

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