Core/shell quantum dots in ferroelectric liquid crystals matrix: effect of spontaneous polarisation coupling with dopant

Pandey, Shivani; Vimal, Tripti; Singh, Dharmendra Pratap; Gupta, Swadesh Kumar; Pathak, Govind; Katiyar, Rohit; Manohar, Rajiv

doi:10.1080/02678292.2016.1155768

Cited by 38 publications

(4 citation statements)

References 39 publications

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“…To control the temperature of the cell we have used INSTEC mK 2000 hot plate. The meticulous experimental details have already been reported by our group [26][27][28][29].…”

Section: Instruments Usedmentioning

confidence: 92%

Dispersion of fluorescent dye in the nematic liquid crystal: Enhanced photoluminescence and high birefringence

Pathak¹,

Agrahari²,

Roy³

et al. 2018

Opto-Electronics Review

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In the present investigation optical, electro-optical and dielectric properties have been measured for nematic liquid crystal (NLC) material 1550C which consists of 4'-(trans, trans-4-alkylbicyclohexyl) carbonates and 4'-(4-(trans,trans-4-alkyl)-4-cyanobicyclohexane, dispersed with fluorescent dye (Benzo 2,1,3 Thiadiazole) in two different concentrations. Photoluminescence has been enhanced for a dye dispersed system which is the key finding of this investigation. UV absorbance study has also been performed and found to be increased for composite system. Enhanced birefringence after dispersion of dye into pure NLC is also a prominent result of this investigation. Relative permittivity, threshold voltage and dielectric anisotropy have also been measured and found to be increased. The outcome of the present work may be very useful in the construction of liquid crystal displays (LCDs).

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“…To control the temperature of the cell we have used INSTEC mK 2000 hot plate. The meticulous experimental details have already been reported by our group [26][27][28][29].…”

Section: Instruments Usedmentioning

confidence: 92%

Dispersion of fluorescent dye in the nematic liquid crystal: Enhanced photoluminescence and high birefringence

Pathak¹,

Agrahari²,

Roy³

et al. 2018

Opto-Electronics Review

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“…The dipolar interaction between QDs and FLC molecules could result into the lower operating voltage of QDs-FLC nanocomposites [72][73][74]. The presence of SNMs has remarkably altered the magnitude of Ps of FLC materials and in most of the cases, it is observed to be reduced.…”

Section: Effect Of Snms On Materials Parameters Of Flcsmentioning

confidence: 99%

“…Besides dielectric, memory effect and material parameters, SNMs can also significantly modulate the photoluminescence (PL) of FLCs. There are various reports focussing on improving PL of FLC materials by dispersing them with suitable NMs which could be useful for FLCs based display and other electro-optical devices [34,39,40,47,53,56,63,64,[72][73][74]. Kumar et al [39] reported the many fold (∼6-10) enhancements in PL intensity and remarkable spectral red shift in MPA (3-Mercaptopropionic acid) capped ZnS QDs (∼2-7 nm) dispersed FLC (KCFLC 7S) nanocomposites.…”

Section: Photoluminescence Of Snms-flcs Nanocompositesmentioning

confidence: 99%

Recent advances on semiconducting nanomaterials–ferroelectric liquid crystals nanocomposites

Kumar¹,

Kwatra²,

Meena³

et al. 2021

J. Phys.: Condens. Matter

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Ferroelectric liquid crystals (FLCs) possess excellent electro-optical properties compared to nematic liquid crystals (LCs) including lower threshold voltage, faster switching response, good optical contrast and bi-stable switching, memory effect, etc. Due to such characteristic features, FLCs are more promising for next generation high performance photonic applications. Moreover, the synergy of FLCs with nanoscience has clearly shown the enormous possibilities to improve their electro-optical properties. Over the past two decades, several investigations of nanomaterials (NMs) (metal, metal oxide, ferroelectric, insulating, graphene, semiconducting etc) dispersed FLC nanocomposites have been carried out. Semiconducting nanomaterials (SNMs), exhibiting quantum confinement effect, have been one of the most explored NMs as dopants in FLCs leading to better molecular alignment, enhanced dielectric behaviour, pronounced memory effect, power efficient, faster switching response and enhanced photoluminescence. Here, we present a focussed review on SNMs–FLCs nanocomposites and propose future work to advance LC nanoscience.

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“…32 Study of tangent loss factor (tan δ) with the variation of frequency of FLC has been reported recently. 33 Evaluation of the timedependent memory effect has also been investigated. 34 The FLCs have also been subjected to both optical response and relaxation behavior studies.…”

Section: Introductionmentioning

confidence: 99%

Dielectric study of three homologous Schiff base ferroelectric liquid crystals with the variations of temperature and frequency

et al. 2020

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In this investigation, the dielectric behaviors of three ferroelectric liquid crystals (FLCs) belonging to a homologous series have been revealed in the frequency range of 10 Hz–10 MHz. FLCs used in this study are three-ring calamitic LCs, namely ([Formula: see text])-4-(((4-(octan-2-yloxy)phenyl)imino)methyl)phenyl 4-([Formula: see text]-octyloxy)benzoate, ([Formula: see text])-4-(((4-(octan-2-yloxy)phenyl)imino)methyl)phenyl 4-([Formula: see text]-decyloxy)benzoate and ([Formula: see text])-4-(((4-(octan-2-yloxy)phenyl)imino)methyl)phenyl 4-([Formula: see text]-undecyloxy)benzoate. The polarizing optical microscopic and differential scanning calorimetric results confirm that these compounds, synthesized as per the known synthetic steps, show not only a ferroelectrically switchable chiral smectic C (SmC[Formula: see text]) phase over a wide thermal range, but also other mesophases such as blue phase-I/II (BP-I/II), chiral nematic (N[Formula: see text]) and unknown smectic (SmX) phases. Several essential dielectric parameters of the FLC phase have been measured at different temperatures. The relative permittivity has been measured with the variations of temperature and frequency. Besides, the dielectric loss and tan [Formula: see text] have been measured. Different dielectric relaxations have been calculated and explained at the molecular level. The systematic measurements revealed a strong anomaly, and crossover of relative permittivity values for the FLCs has been determined at selective frequencies between 1 kHz and 20 kHz. Strong dielectric anomaly/fall for the response function infers the involvement of collective response of dipolar assembly confined to ferroelectric Weiss domains.

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Core/shell quantum dots in ferroelectric liquid crystals matrix: effect of spontaneous polarisation coupling with dopant

Cited by 38 publications

References 39 publications

Dispersion of fluorescent dye in the nematic liquid crystal: Enhanced photoluminescence and high birefringence

Dispersion of fluorescent dye in the nematic liquid crystal: Enhanced photoluminescence and high birefringence

Recent advances on semiconducting nanomaterials–ferroelectric liquid crystals nanocomposites

Dielectric study of three homologous Schiff base ferroelectric liquid crystals with the variations of temperature and frequency

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