Enhanced photoluminescence in CdS nanorods doped with antiferroelectric liquid crystals

Roy, Joy Sankar; Majumder, Tapas Pal; Dąbrowski, R.

doi:10.1016/j.jlumin.2013.12.045

Cited by 31 publications

(17 citation statements)

References 30 publications

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“…The strong light scattering nature of the smectic layers of FLC medium provides a more favourable background for photon-exciton coupling. The strong light scattering nature of smectic layers and their role in the enhancement in PL property has already been reported by Kumar et al [27] The centre of emission peak is independent of the concentration of QDs in the mixtures suggesting that the dispersion of dopant QDs with varying concentration do not produce any remarkable change in the refractive index of FLC and thus no change in the energy of emission peak (any blue or red shift in emission peak) due to uniform size and size-dependent quantum confinement effects ( [25] and references therein). The change in dopant concentration only increases the intensity of emission peak.…”

Section: Liquid Crystalssupporting

confidence: 52%

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Influence of CdSe quantum dot on molecular/ionic relaxation phenomenon and change in physical parameters of ferroelectric liquid crystal

et al. 2015

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2015): Influence of CdSe quantum dot on molecular/ionic relaxation phenomenon and change in physical parameters of ferroelectric liquid crystal, Liquid Crystals, Spherical cadmium selenide (CdSe) quantum dots (QDs), capped with octadecylamine, dispersed in ferroelectric liquid crystal (FLC), can remarkably alter the electro-optical (E-O) parameters (material parameters) of the host compound. Here we present an E-O, dielectric, surface anchoring and fluorescence study demonstrating that the physical properties of host FLC strongly depend on the dopant (QD) concentration. The addition of QDs in FLC changes the surface anchoring of FLC molecules, which results the change in E-O parameters of pristine FLC as a function of QDs concentration. The ion-polarisation coupling induces a new temperature-dependent weak ionic relaxation mode (TDWIRM) in FLC-QDs mixture at a certain concentration of QDs. Dipolar coupling between CdSe QDs and FLC molecules readjust the dielectric properties and molecular/ionic relaxation phenomenon in the FLC-QDs mixtures. The fluorescence of FLC-QDs mixtures is probably due to the coupling between the exciton and photon in LC medium, which leads the radiative process. The behaviour of fluorescence property of FLC-QDs mixtures reveals that the concentration of uniform-sized QDs only changes the fluorescence intensity of the FLC-QDs mixtures.

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Section: Liquid Crystalssupporting

confidence: 52%

“…It is also believed that QDs behave like UV absorbance promoter for FLC material. Recently, Majumder et al [25] have reported the enhancement of absorbance and photoluminescence in CdS nanorods doped AFLC materials. The fluorescence intensity measurement was performed at room temperature in solution (mg/ml) taking ethanol as solvent.…”

Section: Liquid Crystalsmentioning

confidence: 99%

Influence of CdSe quantum dot on molecular/ionic relaxation phenomenon and change in physical parameters of ferroelectric liquid crystal

et al. 2015

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“…The emission peak has been tuned with the variation of concentration of AFLC molecules. This observation may be significantly better than our previous study on CdS nanorods doped with AFLC [25] because of its broader spectrum covering long bandwidth. The pure AFLC, pure ZnS nanoflakes and pure CdS nanorods have their emission maxima at 401.48 nm, 426.58 nm and 525.9 nm, respectively.…”

Section: Introductioncontrasting

confidence: 50%

“…Thus, the physical properties of the nanomaterials can be modified by using the liquid crystalline materials. Our earlier report has experimentally already mentioned about the existence of the enhanced photoluminescence behavior of CdS nanorods in presence of liquid crystals [25]. Kumar et al [26] also experimentally observed the memory effect in cadmium telluride dots doped with ferroelectric liquid crystals.…”

Section: Introductionmentioning

confidence: 89%

Tuning photoluminescence of liquid crystals doped ZnS nanoflakes

et al. 2015

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“…The photoluminescence study of nanoparticle-doped LC system promotes the better understanding of the interaction between nanoparticles and LC molecules. Photoluminescence behavior of NLC doped with TiO 2 NPs has been studied by Roy et al [35], and the enhanced PL intensity for the doped system has been reported. Pathak et al [36] observed the induced photoluminescence behavior in TiO 2 NP-doped NLC system.…”

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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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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Enhanced photoluminescence in CdS nanorods doped with antiferroelectric liquid crystals

Cited by 31 publications

References 30 publications

Influence of CdSe quantum dot on molecular/ionic relaxation phenomenon and change in physical parameters of ferroelectric liquid crystal

Influence of CdSe quantum dot on molecular/ionic relaxation phenomenon and change in physical parameters of ferroelectric liquid crystal

Tuning photoluminescence of liquid crystals doped ZnS nanoflakes

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

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