Study of dynamic light scattering in nematic liquid crystal and its optical, electrical and switching characteristics

Konshina, E. A.; Shcherbinin, D. P.

doi:10.1080/02678292.2017.1323353

Cited by 32 publications

(23 citation statements)

References 33 publications

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“…These impurity ions are deteriorating the quality of LCDs by reducing the voltage holding ratio, increasing threshold voltage, image sticking, gray-level shift and slowing down of response. There are also electro-optical devices like optical shutters and smart windows which rely on ions in liquid crystals [5,6]. Despite, the negative effect of ionic contamination in display techniques, LCs with high ionic conductivity may be used in non-display applications [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

et al. 2018

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In the present investigation, TiO 2 -doped weakly polar nematic liquid crystal (NLC) has been studied. This study mainly focuses on dielectric, electro-optical and optical properties of pure NLC and doped systems. Variation in different parameters like dielectric permittivity, dielectric loss, dielectric anisotropy and conductivity has been noticed. Permittivity of the doped system is almost the same as undoped system. With doping concentration, the ionic contribution to the dielectric loss as observed in low-frequency region has been suppressed and the shift in relaxation frequency toward higher frequency side has also been observed. The electrical conductivity and threshold voltage have been decreased with increasing concentration of nanoparticles (NPs). The continuous increase in dielectric anisotropy with increasing the concentration of NPs has also been observed. These results have been attributed to the trapping capability of free ions by TiO 2 NPs. Further, we focused on the study of photoluminescence (PL), UV absorbance and Fourier transformed infrared spectroscopy (FTIR) of pure and doped systems. The continuous increase in PL intensity without any shift in emission peak has been observed for doped systems. Enhancement in UV absorbance with increasing concentration of NPs has also been observed. The effect of NPs doping on molecular dynamics of NLC can be clearly seen by FTIR study. The results suggest that the TiO 2 NP-doped weakly polar NLC can have significant improved dielectric, electro-optical and optical properties. This makes the weakly polar NLC to be a potential candidate for many applications.

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Section: Introductionmentioning

confidence: 99%

“…These applications include liquid crystal displays (LCD) [1], tunable lenses [2], retarders [3], filters [3], wave plates [3], diffractive optical elements [4], optical shutters [5] and smart windows [6]. Extreme work has been done by many researchers to improve the dielectric, electro-optical and optical properties of NLCs [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

et al. 2018

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“…Поиск способов управления ослаблением оптического излучения в широкой области спектра с высоким контрастом, быстродействием и поляризационной независимостью является актуальной проблемой современных фотонных устройств. Эффект динамического рассеяния света (ДРС) в жидких кристаллах (ЖК, LC) позволяет управлять ослаблением света в видимой и ИК-областях спектра [1][2][3][4][5].…”

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“…Достигнуты малые времена оптической релаксации -до 22.5 ms для массивов тонких светорассеивающих ЖК-ячеек [2]. Показано влияние параметров электрического поля на времена переключения в рассеивающих ячейках [3]. Продемонстрирована возможность селективной аттенюации в рассеивающих ячейках в видимой и ИК-областях спектра [4].…”

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“…Необходимость использования поляризаторов усложняет оптические схемы и приводит к существенным потерям световой интенсивности (до 50% на каждом поляризаторе). ДРС в нематическом жидком кристалле вызвано электрогидродинамической неустойчивостью, возникающей в результате противодействия процессов переориентации директора и протекания ионного тока при приложении напряжения к ЖК-ячейке [1][2][3][4][5].…”

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Динамическое Рассеяние Света В Жидкокристаллических Ячейках С Микроструктурами Металл-Диэлектрик-Полупроводник, Содержащими Золотые Наночастицы

Щербинин¹,

Амосова²,

Большакова³

et al. 2019

Письма В Журнал Технической Физики

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It has been shown the possiblity of threshold voltage reducing of dynamic light scattering effect in LC cells. The decrease of the threshold voltage has occurred due to the use of electrodes with metal-dieletric-semiconduxtor micro-structures containing gold nanoparticles. The enhancement of the electrode efficiency contributes to an increase in the conductivity of the cells and to a decrease in the intensity of passed light in the low-voltage region.

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Effect of the vanadium doped titanium oxide nanoparticles on ionic contribution in dielectric behaviour of a nematic liquid crystal

Chauhan,

Aafreen,

Himanshu

et al. 2024

Appl. Phys. A

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Study of dynamic light scattering in nematic liquid crystal and its optical, electrical and switching characteristics

Cited by 32 publications

References 33 publications

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

Динамическое Рассеяние Света В Жидкокристаллических Ячейках С Микроструктурами Металл-Диэлектрик-Полупроводник, Содержащими Золотые Наночастицы

Effect of the vanadium doped titanium oxide nanoparticles on ionic contribution in dielectric behaviour of a nematic liquid crystal

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