Effects of carbon nanotubes on electro-optic characteristics in vertically aligned liquid crystal display

Lim, Young Jin; Bhattacharyya, S. P.; Tie, Weiwei; Park, Hye Ryung; Lee, Young Hee; Lee, Seung Hee

doi:10.1080/02678292.2013.806997

Cited by 20 publications

(7 citation statements)

References 20 publications

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“…Hence, dependence of the relaxation time over cell confinement conditions is evident. This observation is in compliance with the relaxation mechanism of NLC as described elsewhere [ 9 , 17 , 18 , 19 ].…”

Section: Resultssupporting

confidence: 90%

Dynamic Response of Graphitic Flakes in Nematic Liquid Crystals: Confinement and Host Effect

et al. 2017

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Electric field-induced reorientation of suspended graphitic (GP) flakes and its relaxation back to the original state in a nematic liquid crystal (NLC) host are of interest not only in academia, but also in industrial applications, such as polarizer-free and optical film-free displays, and electro-optic light modulators. As the phenomenon has been demonstrated by thorough observation, the detailed study of the physical properties of the host NLC (the magnitude of dielectric anisotropy, elastic constants, and rotational viscosity), the size of the GP flakes, and cell thickness, are urgently required to be explored and investigated. Here, we demonstrate that the response time of GP flakes reorientation associated with an NLC host can be effectively enhanced by controlling the physical properties. In a vertical field-on state, higher dielectric anisotropy and higher elasticity of NLC give rise to quicker reorientation of the GP flakes (switching from planar to vertical alignment) due to the field-induced coupling effect of interfacial Maxwell-Wagner polarization and NLC reorientation. In a field off-state, lower rotational viscosity of NLC and lower cell thickness can help to reduce the decay time of GP flakes reoriented from vertical to planar alignment. This is mainly attributed to strong coupling between GP flakes and NLC originating from the strong π-π interaction between benzene rings in the honeycomb-like graphene structure and in NLC molecules. The high-uniformity of reoriented GP flakes exhibits a possibility of new light modulation with a relatively faster response time in the switching process and, thus, it can show potential application in field-induced memory and modulation devices.

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Section: Resultssupporting

confidence: 90%

Dynamic Response of Graphitic Flakes in Nematic Liquid Crystals: Confinement and Host Effect

et al. 2017

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“…[12] It has been reported that a small amount of CNT doping effectively reduces optical flicker, image sticking, parasitic backflow and associated optical bounce which are usually perceived as chronic problems with the LC cells. [13,14] Improvements in optical and electro-optic switching behaviour due to the addition of single-walled CNTs (SWCNTs) in ferroelectric LC (FLC) host and emergence of an irreversible memory as a consequence of doping with multi-walled CNTs in FLC and nematic LC have been previously reported. [15][16][17][18] These reports suggested lowering of threshold voltage and improved electro-optic switching behaviour of nematic LCs and FLCs with CNT doping, but their understanding to manipulate CNTs in induced chiral LCs (CLCs) due to strong van der Waals forces is still unexplored.…”

Section: Introductionmentioning

confidence: 99%

Memory effects in chiral nematic liquid crystals doped with functionalised single-walled carbon nanotubes

2015

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Octadecylamine-functionalised single-walled carbon nanotubes (SWCNTs) were dispersed into nematic liquid crystals (LCs) doped with chiral molecules. The collective orientation of nematic LC molecules in helical layers was manipulated by varying dopant concentration. Highly anisotropic nature of SWCNTs enhanced the anisotropy of the LC as confirmed by polarised fluorescence spectroscopy. The π-π interaction of SWCNTs present in the planar alignment layers and twisted nematic LC molecules affects the molecular relaxation process. An irreversible electro-optic memory in the material has been observed.

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“…They exhibit different phases due to different positional and orientational ordering of their constituting molecules. [1][2][3][4][5] Ferroelectric liquid crystalline molecules having translational behaviour are important branch of LCs, because they show signified improvement in physical properties at low concentration doping of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Effects of silver nanoparticles doping on morphology and luminescence behaviour of ferroelectric liquid crystals Langmuir–Blodgett films

2016

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We report the deposition of Langmuir-Blodgett (LB) thin films of low-weight dispersed composite systems of ferroelectric liquid crystals (FLCs)-functionalised silver (Ag) nanoparticles. Because of their amphiphilic nature the molecules form stable Langmuir monolayers, which were transferred to silicon substrates. We noticed that absorption wave numbers are present for each bond constituting FLC-nanoparticles composite system, ensuring a complete transfer of molecules from water sub-phase. XRD showed intense peaks at 2θ = 3.2°due to the layer structure of FLC molecules. We infer from the morphology of LB films that doping of nanoparticles do not provide any hindrance to SmC Ã layer structure of FLC molecules. The photoluminescence study indicates blue shift in emission spectra and peak intensity increases with Ag nanoparticles concentration. ARTICLE HISTORY

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Effects of carbon nanotubes on electro-optic characteristics in vertically aligned liquid crystal display

Cited by 20 publications

References 20 publications

Dynamic Response of Graphitic Flakes in Nematic Liquid Crystals: Confinement and Host Effect

Dynamic Response of Graphitic Flakes in Nematic Liquid Crystals: Confinement and Host Effect

Memory effects in chiral nematic liquid crystals doped with functionalised single-walled carbon nanotubes

Effects of silver nanoparticles doping on morphology and luminescence behaviour of ferroelectric liquid crystals Langmuir–Blodgett films

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