The influence of processing parameters on luminescent oxides produced by combustion synthesis

McKittrick, Joanna; Shea, L. E.; Bacalski, C. F.; Bosze, E.

doi:10.1016/s0141-9382(98)00046-8

Cited by 220 publications

(131 citation statements)

References 18 publications

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“…4(b) shows the FE-SEM image of 1173 K annealed G:Y 2 O 3 and it is observed that the particles are agglomerated with spherical shape and the average particle size is found to be 28 nm [12,13]. In the present work, a large number of moles of gas are liberated in combustion process with urea when compared to glycine [19,23]. This indicates that, particles are loosely agglomerated as observed in U:Y 2 O 3 due to greater amount of gases escaping during combustion reaction.…”

Section: Fe-sem Micrograph Analysismentioning

confidence: 52%

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Synthesis characterization and luminescence studies of gamma irradiated nanocrystalline yttrium oxide

Shivaramu

Lakshminarasappa

Nagabhushana

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Nanocrystalline Y 2 O 3 is synthesized by solution combustion technique using urea and glycine as fuels. X-ray diffraction (XRD) pattern of as prepared sample shows amorphous nature while annealed samples show cubic nature. The average crystallite size is calculated using Scherrer's formula and is found to be in the range 14-30 nm for samples synthesized using urea and 15-20 nm for samples synthesized using glycine respectively. Field emission scanning electron microscopy (FE-SEM) image of 1173 K annealed Y 2 O 3 samples show well separated spherical shape particles and the average particle size is found to be in the range 28-35 nm. Fourier transformed infrared (FTIR) and Raman spectroscopy reveals a stretching of Y-O bond. Electron spin resonance (ESR) shows V − center, O 2 − and Y 2+ defects. A broad photoluminescence (PL) emission with peak at~386 nm is observed when the sample is excited with 252 nm. Thermoluminescence (TL) properties of γ-irradiated Y 2 O 3 nanopowder are studied at a heating rate of 5 K s −1 . The samples prepared by using urea show a prominent and well resolved peak at~383 K and a weak one at~570 K. It is also found that TL glow peak intensity (I m1 ) at~383 K increases with increase in γ-dose up to~6.0 kGy and then decreases with increase in dose. However, glycine used Y 2 O 3 shows a prominent TL glow with peaks at 396 K and 590 K. Among the fuels, urea used Y 2 O 3 shows simple and well resolved TL glows. This might be due to fuel and hence particle size effect. The kinetic parameters are calculated by Chen's glow curve peak shape method and results are discussed in detail.

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Section: Fe-sem Micrograph Analysismentioning

confidence: 52%

“…The average crystallite size is found to be in the range [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] during combustion [19]. The lattice strain and crystallite size are estimated using Williamson-Hall (W-H) equation [20],…”

Section: Resultsmentioning

confidence: 99%

Synthesis characterization and luminescence studies of gamma irradiated nanocrystalline yttrium oxide

Shivaramu

Lakshminarasappa

Nagabhushana

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…Producing nano scale materials opens new opportunities in the creation of product with enhanced properties for applications such as electronics, optics, medicine and magnetism. Luminescent phosphors are among the current nanostructures of materials that can be incorporated into various applications, viz., the development of flat-panel displays depends critically on the design of bright and stable phosphors [4]. Nanocrystalline phosphors are suitable for high definition television (HDTV) where conventional bulk phosphor cannot be used [5].…”

Section: Introductionmentioning

confidence: 99%

Luminescence studies of europium doped yttrium oxide nano phosphor

Jayaramaiah¹,

Lakshminarasappa²,

Nagabhushana³

2012

Sensors and Actuators B: Chemical

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a b s t r a c tLuminescence exhibiting europium doped yttrium oxide (Y 2 O 3 :Eu 3+ ) phosphor was prepared by solution combustion method, using disodium ethylene diamine tetra acetic acid (EDTA-Na 2 ) as fuel at ∼350 • C. Powder X-ray diffraction (PXRD) pattern of Y 2 O 3 :Eu 3+ revealed the cubic crystalline phase. The morphology of the samples was studied by scanning electron microscopy (SEM) and was foamy, fluffy and porous in nature. Fourier transformed infrared spectroscopy (FTIR) revealed prominent absorption with peaks at 3415, 1435, 875 and 565 cm −1 . Optical absorption studies showed the energy gap of the synthesized samples to be 5.4-5.5 eV. The photoluminescence (PL) of Y 2 O 3 :Eu 3+ exhibiting emission peak at 611 nm under the excitation of 254 nm. Thermoluminescence of ␥-irradiated Y 2 O 3 :Eu 3+ showed two well resolved TL glows with peaks at 460 and 610 K and they were analyzed by glow curve shape method and the activation energies were found to be 0.421 eV and 1.016 eV respectively.

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“…Luminescent nanostructured materials have found application in high-energy photoluminescent (plasma panels) and cathodoluminescent (field emission devices) flat-panel displays as they have required characteristics: thermal and chemical stability, luminous efficiency, nanocrystalline structure, ultrafine particle powder phosphors [1]. Moreover, the new technology demand for size reduction of electronic devices requires the investigation of the physical properties of materials on the nanometer scale.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Nanoporous Lanthanide-Doped Gadolinium Gallium Garnet Powders Obtained by Propellant Synthesis

Krsmanović¹,

Polizzi²,

Canton³

2005

Materials Science Forum

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Abstract. In the present work we study the nanocrystalline powders of lanthanide-doped Gd 3 Ga 5 O 12 (GGG, gadolinium gallium garnet) prepared using propellant synthesis. A series of GGG samples containing a number of different trivalent lanthanide ions (Tm, Er, Ho, Eu, Sm, Nd, and Pr) in different quantities (1%, 5%, 10%) were produced. Samples were characterized by X-ray diffraction (pre-and post calcination) for phase identification and line-broadening analysis, and by electron microscopy (SEM and TEM) for morphological and nanostructural investigation. Thermal behavior of the powder was investigated by thermal gravimetric analysis (TGA) and differential thermal analysis (DTA). The samples have a polycrystalline porous structure. Elemental microanalysis made by energy dispersive X-ray spectroscopy (EDX) detector attached to TEM and XRD unit-cell determinations confirmed that the lanthanides ions entered the structure of GGG. Crystallites have a high degree of disorder.

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The influence of processing parameters on luminescent oxides produced by combustion synthesis

Cited by 220 publications

References 18 publications

Synthesis characterization and luminescence studies of gamma irradiated nanocrystalline yttrium oxide

Synthesis characterization and luminescence studies of gamma irradiated nanocrystalline yttrium oxide

Luminescence studies of europium doped yttrium oxide nano phosphor

Characterization of Nanoporous Lanthanide-Doped Gadolinium Gallium Garnet Powders Obtained by Propellant Synthesis

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