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G. Swati

Bio: G. Swati is an academic researcher from VIT University. The author has contributed to research in topics: Phosphor & Luminescence. The author has an hindex of 7, co-authored 18 publications receiving 132 citations. Previous affiliations of G. Swati include Council of Scientific and Industrial Research & Academy of Scientific and Innovative Research.

Papers
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Journal ArticleDOI
TL;DR: In this article, the as-obtained samples were investigated using the characterization techniques such as X-ray diffraction (XRD), field emission scanning electron microscope (FESEM-EDAX), transmission electron microscopy (TEM), photoluminescence (PL), Raman, Fourier transform infrared (FTIR) and UV-Visible absorption spectroscopy respectively.

33 citations

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TL;DR: In this paper, the structural, morphological and luminescent properties of the as-synthesized afterglow nanophosphors have been presented and the mechanism underlined for long afterglows has been discussed using trapping-detrapping model.

24 citations

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TL;DR: A novel application and facile methodology to extract high contrast fingerprints on non-porous and porous substrates using a chemically inert, visible light excitable, and nanosized SrAl2O4:Eu2+,Dy3+ phosphorescent label in the dark is reported.
Abstract: Traditionally used fluorescent powders for developing invisible (latent) fingerprints involve complicated operation and show characteristics of auto-fluorescence interference and high toxicity. To overcome these serious drawbacks we report a novel application and facile methodology to extract high contrast fingerprints on non-porous and porous substrates using a chemically inert, visible light excitable, and nanosized SrAl2O4:Eu2+,Dy3+ phosphorescent label in the dark. The chemistry of non-covalent physisorption interaction between the long afterglow phosphor powder and sweat residue in fingerprints has been discussed in detail. Real-time fingerprint development on porous and non-porous substrates has also been performed.

21 citations

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TL;DR: In this paper, a detailed synthesis mechanism and the structural, morphological and optical characterization of ultraviolet (∼311 nm) excitable samarium doped gadolinium yttrium orthovanadate, (Gd,Y)VO4:Sm3+, nanocrystals were reported.
Abstract: This paper reports the detailed synthesis mechanism and the structural, morphological and optical characterization of ultraviolet (∼311 nm) excitable samarium doped gadolinium yttrium orthovanadate, (Gd,Y)VO4:Sm3+, nanocrystals. X-ray diffraction and Rietveld refinement studies confirmed that the synthesized samples crystallize in a tetragonal structure with I41/amd space group. The enhanced photoluminescence intensity of (Gd,Y)VO4:Sm3+ compared with the existing YVO4:Sm3+ phosphor clearly indicates the significant role of Gd3+ ions. This has been attributed to the sensitization of the 6PJ energy level of Gd3+ ions by energy transfer from orthovanadate (VO43−) ions and subsequent energy trapping by Sm3+ ions. The energy transfer from VO43− to Sm3+ via Gd3+ ions as intermediates and concentration quenching of Gd3+ luminescence are discussed in detail. The optical band gap of the as-prepared nanocrystals has been estimated using UV–vis–NIR absorption spectroscopy, which reveals a slightly higher band gap (3.75 eV) for YVO4 as compared to GdYVO4 (3.50 eV). Furthermore, confocal microcopy, decay parameters and Commission Internationale de l'Eclairage chromatic coordinates have supplemented these studies, which established the suitability of these nanophosphors for achieving spectral conversion in silicon solar cells.

15 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the active role of various fluxes in influencing Pr 3+ emission, afterglow, structural and morphological properties of the as-synthesized (Ca,Zn)TiO 3 :Pr 3+ phosphor.

14 citations


Cited by
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Journal Article
TL;DR: In this paper, the authors solved the energy levels which are important in the absorption spectra of the normal complex ions, leaving the crystalline field strength as a parameter, and calculated positions of lines and bands are rather in good agreement with the experimental data in divalent ions [MX 6 ] 2+ (M=Cr, Mn, Fe, Co, Ni), when they adjust the crystallINE field parameter D q suitably.
Abstract: The secular determinants obtained in the previous paper are solved for the energy levels which are important in the absorption spectra of the normal complex ions, leaving the crystalline field strength as a parameter. The values of B and C (Racah's parameters) there needed are determined from the observed spectra of free ions or in some cases by extrapolation. The f -values of the transitions which connect the energy levels calculated are estimated and compared with the observed intensities. The difference of the spectral width among absorption bands and lines is also considered using the energy diagram obtained. Following the assignments determined by the above considerations, the calculated positions of lines and bands are rather in good agreement with the experimental data in divalent ions [MX 6 ] 2+ (M=Cr, Mn, Fe, Co, Ni), when we adjust the crystalline field parameter D q suitably. In trivalent ions [MX 6 ] 3+ (M=Ti, V, Cr, Mn, Fe), it is necessary besides the adjustment of D q to use smaller values ...

363 citations

Journal ArticleDOI
TL;DR: It was concluded that ZnO nanorod coatings effectively prevented marine micro and macrofouling in static conditions.
Abstract: In laboratory experiments, the antifouling (AF) properties of zinc oxide (ZnO) nanorod coatings were investigated using the marine bacterium Acinetobacter sp. AZ4C, larvae of the bryozoan Bugula ne ...

86 citations

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TL;DR: In this article, Eu 3+ doped barium niobate (Eu 3 + :BaNb 2 O 6 ) phosphors were successfully synthesized by conventional solid state reaction method.

80 citations

Journal ArticleDOI
TL;DR: In this paper, the authors provide a review of the MPL@PCM composites that are of interest for both photocatalytic and lighting fields, in terms of the unique luminescence of MPLs and the principal optical properties of PCMs.

68 citations