Microwave synthesis of Y 2 O 3 :Eu 3+ nanophosphors: A study on the influence of dopant concentration and calcination temperature on structural and photoluminescence properties

Khachatourian, Adrine Malek; Golestani‐Fard, F.; Sarpoolaky, H.; Vogt, Carmen; Vasileva, Elena; Mensi, Mounir; Попов, С. М.; Toprak, Muhammet S.

doi:10.1016/j.jlumin.2015.08.059

Cited by 38 publications

(16 citation statements)

References 49 publications

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“…The luminescence concentration quenching was also studied for the Fe 3 O 4 @SiO 2 @Y 2 O 3 :Eu 3+ (1, 2 and 5 mol%) materials by increasing the concentration of the Eu 3+ dopant. As a result, the

Q_{L n}^{L n}

values decrease gradually by 65, 60 and 58% as the concentrations of the dopant Eu 3+ ion were increased to the 1, 2 and 5 mol%, respectively (Table ), owing to the cross‐relaxation process,, which lead to higher non‐radiative decay rates and shorter lifetimes, as depicted from the normalized luminescence decay curves of the bifunctional composite materials (Figure ). The lifetime values (τ) of the emitting 5 D 0 level of Eu 3+ ion was determined from the decay curves of the luminescent and magnetic materials, which were measured at 300 K by monitoring emission at 612 nm of the 5 D 0 → 7 F 2 hypersensitive transition of Eu 3+ ion and excitation in the LMCT band at 260 nm.…”

Section: Resultsmentioning

confidence: 99%

Red‐Emitting Magnetic Nanocomposites Assembled from Ag‐Decorated Fe₃O₄@SiO₂ and Y₂O₃:Eu³⁺: Impact of Iron‐Oxide/Silver Nanoparticles on Eu³⁺ Emission

et al. 2018

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The new multistep approach for co-assembling magnetic iron oxide nanoflowers with red-emitting Y 2 O 3 :Eu 3 + to form luminescent and magnetic nanocomposites was reported. The Fe 3 O 4 core prepared by solvothermal method was layered by SiO 2 shell and decorated with small size spherical Ag nanoparticles as well as further coated with Y 2 O 3 :Eu 3 + luminophore. The nanoflower shape Fe 3 O 4 core of size~110 nm and crystalline cubic structure of bifunctional iron-oxide@Y 2 O + (1 mol%) nanomaterials were confirmed from X-rays diffraction, EDS spectra and transmission electron microscopy (TEM) images. The static magnetic measurements supported and manifested nonsuperparamagnetic behavior of the materials at 300 K. The iron oxides are usually luminescence quenchers. In order to rationalize this effect, their optical properties based on their emission spectral data and luminescence decay curves were studied. Experimental intensity parameters (W l ), lifetimes (t), intrinsic quantum yield (Q Ln Ln ) as well as radiative (A rad ) and nonradiative (A nrad ) decay rates were calculated to probe the local chemical environment of the Eu 3 + ion and to better understand the phenomena of iron oxide induced luminescence quenching. The highest value of the intrinsic quantum yield (Q Ln Ln = 74%) for the a-Fe 2 O 3 @Y 2 O 3 :Eu 3 + (1 mol%) among all the luminescent and magnetic nanocomposites suggests that a-Fe 2 O 3 phase induces a lower luminescence quenching then Fe 3 O 4 /g-Fe 2 O 3 . The SiO 2 thin layer leads to improve the luminescence efficiency, whereas the Ag nanoparticles act as luminescence quencher. These novel Eu 3 + nanomaterials may act as a red emitting layer for magnetic and light converting molecular devices.[a] Dr.

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Q_{L n}^{L n}

Section: Resultsmentioning

confidence: 99%

Red‐Emitting Magnetic Nanocomposites Assembled from Ag‐Decorated Fe₃O₄@SiO₂ and Y₂O₃:Eu³⁺: Impact of Iron‐Oxide/Silver Nanoparticles on Eu³⁺ Emission

et al. 2018

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“…Hydrothermal synthesis has been used for the synthesis of ceramic NPs of Y, Zr, and Nb, adapted from a method reported earlier [29, 30]. Specifically, 0.03 M Y 3+ , 0.3 M Zr 4+ , and 0.03 M Nb 5+ solutions were prepared in the presence of 0.5 M urea by dissolving Y(NO 3 ) 3 ·6H 2 O, ZrOCl 2 ·xH 2 O and NH 4 NbO(C 2 O 4 ) 2 ·xH 2 O in 40 mL of DI water.…”

Section: Methodsmentioning

confidence: 99%

A Library of Potential Nanoparticle Contrast Agents for X-Ray Fluorescence Tomography Bioimaging

Shaker

Larsson

et al. 2018

Contrast Media & Molecular Imaging

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Nanoparticles (NPs) have been used as contrast agents for several bioimaging modalities. X-ray fluorescence (XRF) tomography can provide sensitive and quantitative 3D detection of NPs. With spectrally matched NPs as contrast agents, we demonstrated earlier in a laboratory system that XRF tomography could achieve high-spatial-resolution tumor imaging in mice. Here, we present the synthesis, characterization, and evaluation of a library of NPs containing Y, Zr, Nb, Rh, and Ru that have spectrally matched K-shell absorption for the laboratory scale X-ray source. The K-shell emissions of these NPs are spectrally well separated from the X-ray probe and the Compton background, making them suitable for the lab-scale XRF tomography system. Their potential as XRF contrast agents is demonstrated successfully in a small-animal equivalent phantom, confirming the simulation results. The diversity in the NP composition provides a flexible platform for a better design and biological optimization of XRF tomography nanoprobes.

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“…[1][2][3] They have high luminous efficiency, excellent luminescence properties, high quantum efficiency, color purity, high brightness, and good atmospheric stability. 4 This nanophosphor based LED can be used to replace incandescent and uorescent lamps due to their longer lifetime, lower energy consumption and eco-friendly behavior. They don't use toxic elements such as mercury as an excitation light source.…”

Section: Introductionmentioning

confidence: 99%

The effect of lithium on structural and luminescence performance of tunable light-emitting nanophosphors for white LEDs

2020

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Microwave synthesis of Y 2 O 3 :Eu 3+ nanophosphors: A study on the influence of dopant concentration and calcination temperature on structural and photoluminescence properties

Cited by 38 publications

References 49 publications

Red‐Emitting Magnetic Nanocomposites Assembled from Ag‐Decorated Fe₃O₄@SiO₂ and Y₂O₃:Eu³⁺: Impact of Iron‐Oxide/Silver Nanoparticles on Eu³⁺ Emission

Red‐Emitting Magnetic Nanocomposites Assembled from Ag‐Decorated Fe₃O₄@SiO₂ and Y₂O₃:Eu³⁺: Impact of Iron‐Oxide/Silver Nanoparticles on Eu³⁺ Emission

A Library of Potential Nanoparticle Contrast Agents for X-Ray Fluorescence Tomography Bioimaging

The effect of lithium on structural and luminescence performance of tunable light-emitting nanophosphors for white LEDs

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Microwave synthesis of Y 2 O 3 :Eu 3+ nanophosphors: A study on the influence of dopant concentration and calcination temperature on structural and photoluminescence properties

Cited by 38 publications

References 49 publications

Red‐Emitting Magnetic Nanocomposites Assembled from Ag‐Decorated Fe3O4@SiO2 and Y2O3:Eu3+: Impact of Iron‐Oxide/Silver Nanoparticles on Eu3+ Emission

Red‐Emitting Magnetic Nanocomposites Assembled from Ag‐Decorated Fe3O4@SiO2 and Y2O3:Eu3+: Impact of Iron‐Oxide/Silver Nanoparticles on Eu3+ Emission

A Library of Potential Nanoparticle Contrast Agents for X-Ray Fluorescence Tomography Bioimaging

The effect of lithium on structural and luminescence performance of tunable light-emitting nanophosphors for white LEDs

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Red‐Emitting Magnetic Nanocomposites Assembled from Ag‐Decorated Fe₃O₄@SiO₂ and Y₂O₃:Eu³⁺: Impact of Iron‐Oxide/Silver Nanoparticles on Eu³⁺ Emission

Red‐Emitting Magnetic Nanocomposites Assembled from Ag‐Decorated Fe₃O₄@SiO₂ and Y₂O₃:Eu³⁺: Impact of Iron‐Oxide/Silver Nanoparticles on Eu³⁺ Emission