Tailoring the particle size from μm→nm scale by using a surface modifier and their size effect on the fluorescence properties of europium doped yttria

Sharma, Pramod K.; Jilavi, Mohammad H.; Naß, Rüdiger; Schmidt, Helmut K.

doi:10.1016/s0022-2313(99)00040-x

Cited by 141 publications

(96 citation statements)

References 16 publications

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“…Even though it has been shown that microstructural parameters such as size and surface of the nanocrystals, level of agglomeration, activator concentration and presence of defects are responsible for the luminescence efficiency of the nanocrystalline phosphors [13,14,18,[30][31][32][33], only a few detailed structural characterizations have been reported [17,22,23,34,35]. In our previous work [36] we studied a series of GGG samples, obtained via solution combustion synthesis, doped with different lanthanide ions (Tm, Er, Ho, Eu, Sm, Nd, Pr) and with different concentrations (1, 5, 10 mol%).…”

Section: Introductionmentioning

confidence: 99%

Structural and luminescence investigation on gadolinium gallium garnet nanocrystalline powders prepared by solution combustion synthesis

et al. 2007

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Nanocrystalline powders of undoped and lanthanide (Pr 3+ , Tm 3+ )-doped gadolinium gallium garnet, Gd 3 Ga 5 O 12 (GGG), were prepared by propellant synthesis and studied by x-ray powder diffraction (XRD), electron diffraction (ED), high-resolution electron microscopy (HREM) and luminescence spectroscopy. The x-ray diffraction patterns of the GGG samples were analysed using the Rietveld method. The Rietveld refinement reveals the existence of two garnet-type phases: both are cubic (space group I a3d) with a slightly different lattice parameter and probably a slightly different composition. Electron diffraction and electron microscopy measurements confirm the x-ray diffraction results. EDX measurements for lanthanide-doped samples show that stable solid solutions with composition Gd 3−x Ln x Ga 5 O 12 , x ≈ 0.3 (Ln = Pr; Tm) have been obtained. The luminescence properties of the Tm 3+ -doped nanocrystalline GGG samples were measured and analysed.

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Section: Introductionmentioning

confidence: 99%

Structural and luminescence investigation on gadolinium gallium garnet nanocrystalline powders prepared by solution combustion synthesis

et al. 2007

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“…Rare earth RE oxide nanoparticles exhibit extraordinary properties; for example, Sharma et al have reported that the luminescence intensity of Y 2 O 3 : Eu 3 , used as a red light-emitting material in fluorescence lamps, is stronger for smaller particles 10 nm . 1 The RE oxides can be used as catalysts or catalyst supports.…”

Section: Introductionmentioning

confidence: 99%

Pore-Structure-Controlled Coagulates of CeO2 Nanoparticles for Supporting Ru Catalysts in Liquid Phase Oxidation of Benzyl Alcohol

Hayashi

Hosokawa

Imamura

et al. 2007

J. Ceram. Soc. Japan

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CeO 2 colloidal particles with a mean crystallite size of 2 nm synthesized by a solvothermal reaction were coagulated with 1 molL solutions of various bases: NaOH, NH 4 OH, Na 2 CO 3 , NH 4 2 CO 3 , NaHCO 3 , and NH 4 HCO 3 . The CeO 2 powders obtained by calcination of the coagulated products at 300? C had almost the same crystallite sizes in a range of 4-5 nm, while their BET surface areas were considerably different. The CeO 2 powders coagulated with Na 2 CO 3 and NH 4 OH had large surface areas due to micropores, and the powders obtained using NaHCO 3 and NH 4 2 CO 3 had large pore-volumes derived from macropores. A series of Ru CeO 2 catalysts were prepared by a precipitation-deposition method, and characteristics of the Ru species supported on these CeO 2 powders having different pore structures were examined in the liquid phase oxidation of benzyl alcohol. The Ru species having well-crystallized RuO 2 bulk state showed only low activities. On the other hand, well dispersed Ru species exhibited high activities. The pore structure of CeO 2 affected the states of the Ru species loaded, and, consequently, affected their activities for the oxidation. Ruthenium species were not loaded on the surface inside the micropores by the preparation method adopted in this work. Accordingly, the RuCeO 2 catalysts with large surface areas derived from meso-and macro-pores had well-dispersed Ru species and showed high activities, which were much higher than that of the RuCeO 2 catalyst prepared by a conventional co-precipitation method.

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“…They did not report the case where yttrium nitrate was used as the yttrium precursor in the wet chemical method. They also reported a wet chemical result from Y 2 O 3 /Eu 2 O 3 powders in which the concentration dependence of the fluorescence in the range from 0-5 mol.% Eu 2 O 3 did not show any concentration quenching [14]. Huang et al [12] sample prepared by combustion synthesis, the onset of quenching began at 12 mol.% [11].…”

Section: Resultsmentioning

confidence: 95%

Sol-gel synthesis and luminescence property of nanocrystalline Y2O3: Eu phosphor using metal nitrate precursors

et al. 2006

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We synthesized nanocrystalline Y2O3:Eu phosphor by a novel sol-gel route using simple metal nitrates and alcohols as the starting materials instead of oxide powders and nitric acid. The structural characteristics and luminescence properties of the sol-gel derived nanocrystalline Y2O3:Eu phosphor were studied by X-ray diffraction, transmission electron microscopy, and photoluminescence measurement. The crystallized crystal size increased from 7 to 55 nm as the firing temperature was increased from 500 to 1000 o C. The red-emitting luminescence dominated by the 5 D0-7 F2 transition of the Eu 3+ ions. The intensity of the red luminescence increased with increasing firing temperature, and concentration quenching was observed with increasing Eu 3+ concentration.

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Tailoring the particle size from μm→nm scale by using a surface modifier and their size effect on the fluorescence properties of europium doped yttria

Cited by 141 publications

References 16 publications

Structural and luminescence investigation on gadolinium gallium garnet nanocrystalline powders prepared by solution combustion synthesis

Structural and luminescence investigation on gadolinium gallium garnet nanocrystalline powders prepared by solution combustion synthesis

Pore-Structure-Controlled Coagulates of CeO2 Nanoparticles for Supporting Ru Catalysts in Liquid Phase Oxidation of Benzyl Alcohol

Sol-gel synthesis and luminescence property of nanocrystalline Y2O3: Eu phosphor using metal nitrate precursors

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