H. Nagabhushana

Tumkur University, Tumkūr, Karnataka, India

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Publications (173)289.8 Total impact

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    ABSTRACT: The study reports green mediated combustion route for the synthesis of Tb3+ ion activated Y2O3 nanophosphors using Aloe Vera gel as fuel. The concentration of Tb3+ plays a key role in controlling the morphology of Y2O3 nanostructures. The formation of different morphologies of Y2O3: Tb3+ nanophosphors were characterized by PXRD, SEM, TEM and HRTEM. PXRD data and Rietveld analysis evident the formation of single phase Y2O3 with cubic crystal structure. The influence of Tb3+ ion concentration on structural morphology, UV–visible absorption and PL emission were investigated systematically. The PL emission of Y2O3: Tb3+ (1–11 mol%) nanophosphors were studied in detail under 271 and 304 nm excitation wavelengths. The CIE coordinates lies well within green region and correlated color temperature values were found to be 6221 and 5562 K under different excitations. Thus, the present phosphor can serve as an excellent candidate for LEDs. Further, prismatic Y2O3: Tb3+ (3 mol%) nanophosphor showed significant antibacterial activity against Pseudomonas desmolyticum and Staphylococcus aureus. The present study successfully demonstrates Y2O3: Tb3+ nanophosphors can be used for display applications as well as in medical applications for controlling pathogenic bacteria.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 12/2015; 151. DOI:10.1016/j.saa.2015.06.081 · 2.13 Impact Factor
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    ABSTRACT: Europium doped lanthanum aluminate nanophosphors were synthesized by a combustion process using Oxalyl di-hydrazide as fuel. The nanophosphors calcined at 900 °C for 3 h were characterized by PXRD, FTIR spectroscopy, SEM and TEM. The average crystallite size determined by TEM and Scherrer's method was found to be in the range 20–50 nm. The characteristic emission peaks (λexi - 395 nm) recorded at ∼ 591, 616, 646 and 696 nm (5D0→7Fj=0,1,2,3) may be attributed to the 4f–4f intra shell transitions of Eu3+ ions. The estimated CIE chromaticity co-ordinates were calculated from emission spectra, were close to the national television standard committee value of red emission. Correlated color temperature was found to be 1929 K.
    Dyes and Pigments 11/2015; 122. DOI:10.1016/j.dyepig.2015.06.002 · 3.47 Impact Factor
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    ABSTRACT: Facile and green route was employed for the synthesis of Y2O3:Dy(3+) (1-11mol%) nanostructures (NSs) using Aloe vera gel as fuel. The formation of different morphologies of Y2O3:Dy(3+) NSs were characterized by SEM, TEM and HRTEM. PXRD data and Rietveld analysis evident the formation of single phase Y2O3 with cubic crystal structure. The influence of Dy(3+) ion concentration on the structure morphology, UV absorption, PL emission and photocatalytic activity of NSs were investigated. NSs exhibited an intense warm white emission with CIE chromaticity coordinates (0.32, 0.33) and average CCT value ∼5525K which corresponds to vertical day light. The control of Dy(3+) ion on Y2O3 matrix influences the photocatalytic decolorization of Metanil Yellow as a model compound was evaluated. The enhanced photocatalytic activities of core shell structured Y2O3:Dy(3+) (1mol%) was attributed to co-operation effect of dopant concentration, crystallite size, textural properties and capability for reducing electron-hole pair recombination. Further, the recycling catalytic ability of Y2O3:Dy(3+) (1mol%) nanostructure was also evaluated and found promising photocatalytic performance with negligible decrease in decolorization efficiency even after sixth successive cyclic runs. Considering its green, facile synthesis and recyclable feature from an aqueous solution, the present Y2O3:Dy(3+) (1mol%) nanophosphor can be considered as one of the ideal photocatalyst for various potential applications. Copyright © 2015 Elsevier B.V. All rights reserved.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 10/2015; 149:687-697. DOI:10.1016/j.saa.2015.05.007 · 2.13 Impact Factor
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    ABSTRACT: MgO:Fe(3+) (0.1-5mol%) nanoparticles (NPs) were synthesized via eco-friendly, inexpensive and simple low temperature solution combustion route using Aloe vera gel as fuel. The final products were characterized by SEM, TEM and HRTEM. PXRD data and Rietveld analysis revealed the formation of cubic system. The influence of Fe(3+) ion concentration on the structure morphology, UV absorption, PL emission and photocatalytic activity of MgO:Fe(3+) NPs were investigated. The yellow emission with CIE chromaticity coordinates (0.44, 0.52) and average correlated color temperature value was found to be 3540K which corresponds to warm light of NPs. The control of Fe(3+) on MgO matrix influences the photocatalytic decolorization of methylene blue (MB) under UV light. The enhanced photocatalytic activity of MgO:Fe(3+) (4mol%) was attributed to dopant concentration, effective crystallite size, textural properties, decreased band gap and capability for reducing the electron-hole pair recombination. Further, the trends of inhibitory effect in the presence of different radical scavengers were explored. These findings open up new avenues for the exploration of Fe-doped MgO in eco-friendly water applications and in the process of display devices. Copyright © 2015 Elsevier B.V. All rights reserved.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 10/2015; 149:703-713. DOI:10.1016/j.saa.2015.05.003 · 2.13 Impact Factor
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    ABSTRACT: a b s t r a c t Eco-friendly, cost effective and bio template route was used for the preparation of cubic Gd 2 O 3 :Eu 3+ nanophosphors using Euphorbia tirucalli (E. tirucalli) plant latex as fuel. As – formed Gd 2 O 3 :Eu 3+ (7 mol%, 1–7 ml), calcined Gd 2 O 3 :Eu 3+ (7 mol%, 1–7 ml) and Gd 2 O 3 :Eu 3+ (1–11 mol%, 7 ml) samples were characterized using XRD, SEM and UV–Vis absorption spectrophotometer. With increase in latex concen-tration, the nanophosphor gets transformed from nano plates to rose – like nanoflowers with size varying from 20 to 30 nm. X-ray diffraction pattern of as – formed product shows hexagonal Gd (OH) 3 : Eu 3+ phase and it converts to pure cubic phase of Gd 2 O 3 :Eu 3+ on calcination at 600 °C for 3 h. Rietveld refinement of Gd 2 O 3 :Eu 3+ (7 mol%, 7 ml) revealed the presence of cations in the 8b (0.25, 0.25, 0. 25) and 24d positions (À0.0287, 0.00, 0. 25) and the anions in the 48e positions (0.39, 0.15, 0. 37) with space group Ia-3(206). The photoluminescence intensities of transitions between different J levels depend on the symmetry of the local environment of Eu 3+ ion activators and the high ratio of intensity of (5 D 0 ? 7 F 2) and (5 D 0 ? 7 F 1) provides the conclusion that Eu 3+ ion occupies sites with a low symmetry and without an inversion centre. The chromaticity and the CIE coordinates were very close to the standard red color region. The absorption observed in the excitation spectra shows the suitability of the nanophosphor obtained in this study for getting excited in UV, NUV and visible regions for variety of display applica-tions. Further, the Gd 2 O 3 :Eu 3+ (7 mol%, 1–7 ml) samples were experimented towards the photocatalytic behavior on Congo red (CR) and correlated with emission of PL intensity. The decolorization of dye was found to decreased from 83 to 54% with increase in the plant latex concentration. Ó 2014 Elsevier B.V. All rights reserved.
    Journal of Alloys and Compounds 09/2015; 619. DOI:10.1016/j.jallcom.2014.09.050 · 2.73 Impact Factor
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    ABSTRACT: Nanoparticles of Eu3+ doped (1–11 mol%) GdAlO3 were prepared using low temperature (350 °C) solution combustion technique with gadalonium nitrate as oxidizer and oxalyl di-hydrazide (ODH) as a fuel. The synthesized samples were calcined at 1000 °C for 3 h and used for Powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and UV–visible absorption (UV–vis) characterization techniques. A pure orthorhombic was obtained in calcined samples. The average crystallite sizes were estimated using Scherrer's formula, W–H and size–strain plots and found to be in the range 25–50 nm and the same was confirmed by Transmission electron microscopy (TEM) studies. The phosphors exhibit bright red emission upon 395 nm excitation. The characteristic emission peaks recorded at ~591, 612, 654 and 694 nm (5D0→7Fj=1,2,3,4) were attributed to the 4f–4f intra-shell transitions of Eu3+ ions. The CIE chromaticity co-ordinates were calculated from emission spectra, the values (x, y) were very close to NTSC standard value of red emission. Further, the average CCT value was found to be ~2369 K, as a result the prepared nanophosphor was highly useful for red component of white light emitting devices and also for solid state display applications.
    Journal of Luminescence 07/2015; 163. DOI:10.1016/j.jlumin.2015.03.006 · 2.37 Impact Factor
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    ABSTRACT: A simple and efficient method of reduction for the preparation of reduced graphene oxide (rGO) from graphene oxide (GO) using Cinnamon (Cinnamomum zeylanicum) extract is reported. The reduction of GO was confirmed by XRD, TEM and UV–visible techniques. The rGO has shown to possess significantly high dye removal property of Malachite green (MG) and Methylene blue (MB) dyes in the absence of UV or Sun light. Further, it showed considerable antioxidant activity against scavenging of 1, 1-Diphenyl-2-picrylhydrazyl (DPPH) free radicals. The study illustrates an environment friendly green method for the efficient reduction of GO.
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    ABSTRACT: Multifunctional zinc oxide nanoparticles (ZnO Nps) were synthesized by solution combustion synthesis using beetroots (Beta vulgaris). The structure and morphology of the product were studied by powder X-ray diffraction, UV-visible spectroscopy and scanning electron microscopy. XRD studies indicate the formation of Nps with hexagonal wurtzite structure having crystallite sizes in the range of ∼ 52-76 nm. The UV-visible spectrum of Nps shows maximum absorption at 373 nm. The SEM analysis indicates the formation of porous, sponge-like agglomerated structures. Very interesting room temperature luminescence phenomena were observed with violet, green and red emissions upon exciting the ZnO Nps at 378 nm. This phenomenon could be due to oxygen vacancy and ZnO interstitial defects. ZnO Nps effectively degrade malachite green (MG) and methylene blue (MB) dyes in the presence of UV light. Nps show good antioxidant activity by scavenging 1,1-Diphenyl-2-picrylhydrazyl (DPPH) radicals. The study successfully demonstrates simple, economical and ecofriendly methods of synthesis of multifunctional ZnO Nps. Nps may be used as good color tunable phosphor materials. The method demonstrated in this study is suggested as an effective replacement for the hazardous chemical methods of production of zinc oxide nanoparticles.
    European Physical Journal Plus 06/2015; 130(6). DOI:10.1140/epjp/i2015-15109-2 · 1.48 Impact Factor
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    ABSTRACT: CdSiO3:Cr3+ (1–9 mol%) nanophosphor was synthesized by a low temperature solution combustion technique. The final products were well characterized by powder X-ray diffraction (PXRD), scanning electron microscopy, transmission electron microscopy as well as Fourier transform infra-red, Raman and UV–visible spectroscopies. The PXRD results revealed that the samples were well crystallized with monoclinic phase. The average crystallite sizes estimated by Scherrer׳s method, Williamson–Hall (W–H) plots and size–strain plot were found to be in the range of 20–45 nm. The energy band gap of the phosphors was found to be in the range of 5.42–5.47 eV. Photoluminescence studies show an intense emission peak at 691 nm for the excitation wavelength of 361 nm, which corresponds to 2Eg→4A2g transition of R-line of chromium. Racah parameters were estimated to describe the effects of electron–electron repulsion within the crystal lattice. It was observed that PL intensity increases with increase in Cr3+ concentration. The highest PL intensity was observed from 7 mol% doped sample and thereafter, it decreases with further increase in Cr3+ concentration; this may be due to cross relaxation leading to a concentration quenching. The chromaticity co-ordinates and correlated color temperature of all the phosphors were well located in red region, which is a high potential for the fabrication of red component of white light emiting diodes (WLEDs).
    Journal of Luminescence 05/2015; 161. DOI:10.1016/j.jlumin.2015.01.028 · 2.37 Impact Factor
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    ABSTRACT: In this paper, a robust and simple biogenic route has been developed to synthesize self-assembled ZnO superstructures in short interval of time using naturally available aloe vera plant gel and zinc nitrate as starting materials. The stabilization of zinc ions with polysaccharides wrapped chains along with the support of proteins, lipids and physterols of aloe vera gel followed by combustion derives the ZnO superstructures. The obtained ZnO superstructures shows hexagonal crystal phase and exhibit semiconducting behaviour with the energy band gap varies from 2.92 - 3.08 eV. The aloe vera gel derived ZnO superstructures exhibit unique and strong orange-red emission centered at 600 nm. The better structural, morphological and photoluminescence results are obtained for ZnO prepared with 16.6 % W/V of zinc nitrate with aloe vera content compared to other concentrations of aloe vera. The prepared compounds are tested for antimalassezial activity against Malassezia furfur - dermatologically prevalent yeast and were found to have Minimum Inhibitory Concentration (MIC) values ranging from 8 µg/ml to 125 µg/ml. Fluorescence microscopic analysis revealed that yeast cells treated with ZnO superstructures have the chromatin as orange instead of green show casing the cell aggregation suggests that ZnO superstructures have an immense potential as antifungal agent. Hence, the explored method of preparation shows high efficient ZnO superstructures derived from the aloe vera plant gel have potential applications in medicine, biomedical and cosmetic industries.
    ACS Sustainable Chemistry & Engineering 05/2015; 3(6):150515103806001. DOI:10.1021/sc500784p
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    ABSTRACT: We report photo and thermoluminescence properties of Zn2SiO4: Re3+ (Eu, Dy, Sm) phosphors prepared by low temperature solution combustion technique. The hexagonal phase was confirmed by PXRD patterns. SEM micrographs revealed that morphological features were highly dependent on type of the dopant ion. Characteristic excitation and emission peaks of Eu3+, Dy3+ and Sm3+ were observed from PL studies. The concentration quenching occurred for 3 mol% R3+ doped lanthanide ions, whose critical energy transfer distance (Rc) was found to be ∼13 Ǻ. The corresponding concentration quenching was verified to be dipole-dipole interaction. The chromaticity co-ordinates of Zn2SiO4:Eu3+/Dy3+/Sm3+ phosphors were located in white region suggests them to be a potential candidate for the production of white light emitting phosphors. Three TL glow peaks in Eu3+, Dy3+ doped and two glow peaks in Sm3+ doped Zn2SiO4 nanophosphor observed in TL studies indicated that more than one type of traps were created in these phosphors. TL intensity increases linearly in Sm3+ doped Zn2SiO4 upto 4 kGy and thereafter, it decreases. Upto 4 kGy, the phosphor was quite useful in radiation dosimetry.
    Optik - International Journal for Light and Electron Optics 05/2015; DOI:10.1016/j.ijleo.2014.07.149 · 0.77 Impact Factor
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    ABSTRACT: The study reports a facile method for the green synthesis of copper oxide nanoparticles (CuO Nps) by a solution combustion method using Tinospora cordifolia water extract. The Nps were characterized by XRD, SEM, TEM and UV-visible studies. XRD data indicates the formation of pure monoclinic crystallite structures of CuO Nps. SEM images show that the particles have sponge like structure with large surface area and the average crystallite sizes were found to be similar to 6-8 nm. These observations were confirmed by TEM analysis. Photocatalytic activity studies of CuO Nps reveal that they act as very good catalyst for the effective degradation of methylene blue (MB) in the presence of IN and Sun light. Also, the degradation of MB was found to be pH dependent. The Nps found to inhibit the activity of 1,1-Diphenyl-2-picrylhydrazyl (DPPH) free radicals effectively. CuO Nps exhibit significant bactericidal activity against Klebsiella aerogenes, Pseudomonas aeruginosa, Escherichia coli and Staphylococcus aureus. The study reveals a simple, ecofriendly and robust method for the synthesis of multifunctional CuO nanoparticle employing under-utilized medicinal plants.
    Materials Science in Semiconductor Processing 05/2015; 33:81-88. DOI:10.1016/j.mssp.2015.01.034 · 1.76 Impact Factor
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    ABSTRACT: Spherical shaped cerium dioxide (CeO2) nanoparticles (NPs) were synthesized via bio mediated route using Leucas aspera (LA) leaf extract. The NPs were characterized by PXRD, SEM, UV-Visible techniques. Photoluminescence (PL), photocatalysis and antibacterial properties of NPs were studied. PXRD patterns and Rietveld analysis confirm cubic fluorite structure with space group Fm-3m. SEM results evident that morphology of the NPs was greatly influenced by the concentration of LA leaf extract in the reaction mixture. The band gap energy of the NPs was found to be in the range of 2.98-3.4eV. The photocatalytic activity of NPs was evaluated by decolorization of Rhodamine-B (RhB) under UVA and Sun light irradiation. CeO2 NPs show intense blue emission with CIE coordinates (0.14, 0.22) and average color coordinated temperature value ∼148,953K. Therefore the present NPs quite useful for cool LEDs. The superior photocatalytic activity was observed for CeO2 NPs with 20ml LA under both UVA and Sunlight irradiation. The enhanced photocatalytic activity and photoluminescent properties were attributed to defect induced band gap engineered CeO2 NPs. Further, CeO2 with 20ml LA exhibit significant antibacterial activity against Escherichia coli (EC) and Staphylococcus aureus (SA). These findings show great promise of CeO2 NPs as multifunctional material for various applications. Copyright © 2015 Elsevier B.V. All rights reserved.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 04/2015; 149:452-462. DOI:10.1016/j.saa.2015.04.073 · 2.13 Impact Factor
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    ABSTRACT: The study details a green-mediated hydrothermal route for the synthesis of Eu3+ activated La(OH)3 and La2O3 nanophosphors using Calotropis milk latex (CML) as a surfactant. The functionalization of as-formed La (OH)3: Eu3+ (10 ml, 1, 5, 9, 11 mol%), calcined La2O3: Eu3+ (2?12 ml, 9 mol%) and La2O3: Eu3+ (10 ml, 1?11 mol%) nanophosphors was investigated through PXRD, FTIR, SEM, TEM and photoluminescence (PL) studies. From the surface morphology, it was noticed that the CML/Eu3+ concentration showed tremendous potential in the self-assembly process and has been utilized as a soft template for the engineering of ordered nanostructures. The energy band gap of calcined La2O3: Eu3+ (10 ml, 1?11 mol%) was found to decrease from 4.68 to 3.91 eV. The PL intensities of transitions between different J levels depend on the symmetry of the local environment of Eu3+ activators. The high ratio of intensity of (5D0???7F2) and (5D0???7F1) provides the conclusion that the Eu3+ ion occupies a site with a low symmetry and without an inversion centre. La (OH)3: Eu3+ (10 ml, 9 mol%) and La2O3: Eu3+ (10 ml, 9 mol%) nanophosphors show an intense red emission with CIE coordinates (0.56, 0.43) and (0.58, 0.41) respectively. The correlated color temperature (1893 K, 1786 K) was within the range of vertical daylight. The present study successfully demonstrates biotemplate-mediated green synthesis of hexagonal La(OH)3: Eu3+ and La2O3: Eu3+ nanophosphors for display applications.
    04/2015; 2(4):045402. DOI:10.1088/2053-1591/2/4/045402
  • Dataset: 42
  • D. Suresh, Udayabhanu, H. Nagabhushana, S. C. Sharma
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    ABSTRACT: The study reports a facile green method for the effective reduction of graphene oxide (GO) using Cloves (Syzygium aromaticum) extract by a reflux method at 100 degrees C for 30 min. Formation of a few layered reduced graphene oxide (rGO) was confirmed by XRD, TEM and UV-visible studies. Carcinogenic dye degradation and antioxidant properties of the rGO were evaluated. Methylene blue (MB) and Malachite green (MG) dyes were found to be eliminated completely within 20 min in dark condition in the presence of 20 mg rGO. The prepared rGO was found to have IC50 value of 1337 mu g/ml towards quenching of DPPH free radicals. The investigation describes an environment friendly and cost effective method for the green reduction of GO to attain multifunctional rGO.
    Materials Letters 03/2015; 142:4-6. DOI:10.1016/j.matlet.2014.11.073 · 2.27 Impact Factor
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    ABSTRACT: A simple and eco-friendly solution combustion route was used to prepare ZnO nanoparticles (ZNPs) using Banyan Tree (BT) and Euphorbia tirucalli (ET) plant latexes as fuels. The final products were characterized by powder x-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), UV-visible, scanning electron microcopy (SEM) and transmission electron microscopy (TEM). The PXRD result reveals the formation of hexagonal phase with Wurtzite structure. The crystallite size obtained from TEM was found to be ~20-25 nm. SEM results reveal rose-like morphology with BT latex and hexagonal shaped with ET latex. The energy band gap of ZNPs obtained by BT and ET latex were found to be 3.20 and 3.38 eV, respectively. Photoluminescence (PL) emission peaks at ~421, 458, 505, 522, 628 and 695 nm were observed in both the samples when excited at 383 nm. These emission peaks were mainly attributed to deep level oxygen (blue-green) defect and exciton (UV) defects, respectively. The international commission on illumination (CIE) chromaticity co-ordinates, as well as co-ordinated color temperature (CCT), were estimated from the emission spectra; the values (x, y) were very close to national television system committee (NTSC) standard values of pure white emission. Photocatalytic activity (PCA) of ZNPs prepared was studied in detail. The ZNPs prepared using BT latex showed highest PCA under sunlight. The results demonstrate that the synthesized product could be quite useful for display applications as well as photocatalyst. Further, the material prepared by this route was found to be non-toxic, environmentally friendly and could be a potential alternative to economical routes.
    03/2015; 2(3):035011. DOI:10.1088/2053-1591/2/3/035011
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    ABSTRACT: Pure cadmium silicate (CdSiO3) nanophosphor was prepared by a low temperature solution combustion technique. In this technique meso-structured silica was used as silica source. The prepared compounds were well characterized by powder X-ray diffraction (PXRD), scanning electron microscopy, high resolution transmission electron microscopy, Fourier transform infrared and UV–vis spectroscopic techniques. The PXRD peaks of as-formed sample are broad and amorphous in nature. The compound calcined at 800 °C shows pure monoclinic phase, which is the lowest temperature reported so far to obtain in this phase. The average crystallite size for phase pure compound was found to be ∼31 nm. The optical energy band gap of ∼5.6 eV was observed for the compound. Raman spectrum of the sample showed the all possible states of vibrational motions of the prepared samples. The UV irradiated samples with different dose and time with constant heating rate exhibit the thermoluminescence (TL) with a well resolved glow peak at ∼160 °C. The variation of TL intensity with dosage time results that the material was found to be quite useful in radiation dosimetry. The frequency dependent dielectric constant of the prepared sample exhibits high value at low frequency and vice versa.
    02/2015; 2(2). DOI:10.1016/j.jascer.2015.02.003
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    ABSTRACT: CeO2:Ho(3+) (1-9mol%) nanopowders have been prepared by efficient and environmental friendly green combustion method using Aloe vera gel as fuel for the first time. The final products are well characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), fourier transform infrared (FTIR). Bell, urchin, core shell and flower like morphologies are observed with different concentrations of the A. vera gel. It is apparent that by adjusting the concentration of the gel, considerable changes in the formation of CeO2:Ho(3+) nano structures can be achieved. Photoluminescence (PL) studies show green (543, 548nm) and red (645, 732nm) emissions upon excited at 400nm wavelength. The emission peaks at ∼526, 548, 655 and 732nm are associated with the transitions of (5)F3→(5)I8, (5)S2→(5)I8, (5)F5→(5)I8 and (5)S2→(5)I7, respectively. Three TL glow peaks are observed at 118, 267 and 204°C for all the γ irradiated samples which specify the surface and deeper traps. Linear TL response in the range 0.1-2kGy shows that phosphor is fairly useful as γ radiation dosimeter. Kinetic parameters associated with the glow peaks are estimated using Chen's half width method. The CIE coordinate values show that phosphor is quite useful for the possible applications in WLEDs as orange red phosphor. Copyright © 2015 Elsevier B.V. All rights reserved.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 02/2015; 145:63-75. DOI:10.1016/j.saa.2015.02.075 · 2.13 Impact Factor