Electrically modulated fluorescence in optically active polymer stabilised cholesteric liquid crystal shutter

Kumar, Rishi; Raina, K. K.

doi:10.1080/02678292.2013.851287

Cited by 37 publications

(6 citation statements)

References 32 publications

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“…Depending on the concentration of the polymeric materials in the LC matrix a variety of network structures can be created. In recent years, efforts [3][4][5][6] have been made to investigate the influence of polymer network in LCs molecules. Raina et al [3,4,6] have carried out measurement of photo luminous (PL) and electro-optical parameters of LC-PC system.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of birefringence of liquid crystals with dispersion of poly (n-butyl methacrylate) (PBMA)

et al. 2015

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In this work, we have reported the temperature dependence of birefringence for pure liquid crystals (LCs) and liquid crystal-polymer composite (LC-PC) systems. The enhancement of the electro-optical performances is higher in LC with poly (n-butyl methacrylate) polymer. The temperature dependence of the birefringence (Δn) were determined from the transmitted intensity. Dielectric study of pure LC system and LC-PC system has also been presented as a function of frequency. The observed results may be attributed to the occurrence of polymeric domains (chains) formed in LCs. The complete study reveals that the use of polymeric materials in nematic LCs is effective to improve the response in phase shifters devices.

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Section: Introductionmentioning

confidence: 99%

“…(colour online) Variation of dielectric loss (ε \ ″) with frequency for pure LC and LC-PC systems 6. M. Pande et al…”

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confidence: 97%

Enhancement of birefringence of liquid crystals with dispersion of poly (n-butyl methacrylate) (PBMA)

et al. 2015

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“…At 0.4 wt% CNT concentration, the LC molecules likely got confined within the well- defined chain like boundaries which bind the twisted nematic molecules, (Figure 2(d)) thus stabilising the host LC matrix. [30] We believe that the presence of CNTs has induced anisotropic interactions with CLC molecules and hence disrupted the ordering at the interfaces. The presence of ODA functional group has perhaps restricted CNTs from causing aggregation by aligning itself in the planes of helically twisted LC.…”

Section: Morphological Analysismentioning

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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“…The reflection peak appears as a band whose width depends on the birefringence of the sample Δn according to the equation Δλ = pΔn. This phenomenon can be exploited in the field of display technology as reflection-type LC displays, [9][10][11][12][13] or in polarisers, filters, [14] lasers, [15] smart windows, [16] shutters [17] and solar concentrators. [18] For the same reasons, the CLC property to change colour with temperature [19,20] or substrate bending [21] can also be exploited.…”

Section: Induced Cholesteric Solutions Of Highly Soluble Bissalicylalmentioning

confidence: 99%

Induced cholesteric solutions of highly soluble bis-salicylaldiminate Cu(II) metallomesogens and their rheological behaviour

et al. 2015

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Copper(II) complexes containing chiral centres and functionalised with citronellyl end groups were synthesised.\ud Isomerisation of citronellyl double bond was exploited to decrease the melting temperature of the complexes and\ud improve their solubility in organic media. The chiral metallomesogens were successfully used to produce induced\ud cholesteric solutions in commercial nematic liquid crystals also in high concentrations. Transparent and coloured\ud thin films were easily obtained showing good reflective properties across the visible spectrum. The rheological\ud behaviour of the nematic and the cholesteric phases was investigated. The nematic system showed the characteristics\ud of a tumbling phase with a very peculiar transient behaviour. The cholesteric samples also showed a very\ud unusual, flow-history-dependent transient behaviour. The viscosity trend presumably indicates a flow-induced\ud orientation of the cholesteric superstructure, thus opening the way to the possibility of tuning the yield stress level\ud of the material. The results support the potentiality of these compounds for applications in light reflecting\ud technology

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Electrically modulated fluorescence in optically active polymer stabilised cholesteric liquid crystal shutter

Cited by 37 publications

References 32 publications

Enhancement of birefringence of liquid crystals with dispersion of poly (n-butyl methacrylate) (PBMA)

Enhancement of birefringence of liquid crystals with dispersion of poly (n-butyl methacrylate) (PBMA)

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

Induced cholesteric solutions of highly soluble bis-salicylaldiminate Cu(II) metallomesogens and their rheological behaviour

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