| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Verbeeck, Jo
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (22/22 displayed)
- 2024Phase coexistence induced surface roughness in V<sub>2</sub>O<sub>3</sub>/Ni magnetic heterostructurescitations
- 2024Stabilizing Perovskite Pb(Mg<sub>0.33</sub>Nb<sub>0.67</sub>)O<sub>3</sub>-PbTiO<sub>3</sub> Thin Films by Fast Deposition and Tensile Mismatched Growth Templatecitations
- 2023Low-Dose 4D-STEM Tomography for Beam-Sensitive Nanocompositescitations
- 2022On the formation mechanisms of intragranular shear bands in olivine by stress-induced amorphizationcitations
- 2021Optical versus electron diffraction imaging of Twist-angle in 2D transition metal dichalcogenide bilayerscitations
- 2021Increased performance improvement of lithium-ion batteries by dry powder coating of high-nickel NMC with nanostructured fumed ternary lithium metal oxidescitations
- 2020Single femtosecond laser pulse excitation of individual cobalt nanoparticlescitations
- 2020Reliable Characterization of Organic and Pharmaceutical Compounds with High Resolution Monochromated EEL Spectroscopycitations
- 2020Unravelling stacking order in epitaxial bilayer MX₂ using 4D-STEM with unsupervised learningcitations
- 2019Controlling the interfacial conductance in <tex>$LaAlO_{3}/SrTiO_{3}$</tex> in 90 degrees off-axis sputter depositioncitations
- 2018Getting rid of anti-solvents: gas quenching for high performance perovskite solar cellscitations
- 2017Energy level alignment and cation charge states at the <tex>$LaFeO_{3}/LaMnO_{3}$</tex> (001) heterointerfacecitations
- 2017One step toward a new generation of C-MOS compatible oxide PN junctionscitations
- 2017Direct observation of enhanced magnetism in individual size- and shape-selected 3d transition metal nanoparticlescitations
- 2016A universal deposition protocol for planar heterojunction solar cells with high efficiency based on hybrid lead halide perovskite familiescitations
- 2016Long-range domain structure and symmetry engineering by interfacial oxygen octahedral coupling at heterostructure interfacecitations
- 2016Engineering properties by long range symmetry propagation initiated at perovskite heterostructure interface
- 2015Co-rich ZnCoO nanoparticles embedded in wurtzite <tex>$Zn_{1-x}Co_{x}O$</tex> thin filmscitations
- 2014Crystal Structure and Luminescent Properties of R2-xEux(MoO4)(3) (R = Gd, Sm) Red Phosphorscitations
- 2014Influence of the structure on the properties of <tex>$Na_{x}Eu_{y}(MoO_{4})_{z}$</tex> red phosphorscitations
- 2012Artificial construction of the layered Ruddlesden–Popper Manganite La2Sr2Mn3O10by reflection high energy electron diffraction monitored pulsed laser deposition
- 2012Grain size tuning of nanocrystalline chemical vapor deposited diamond by continuous electrical bias growth: Experimental and theoretical studycitations
Places of action
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article
Influence of the structure on the properties of <tex>$Na_{x}Eu_{y}(MoO_{4})_{z}$</tex> red phosphors
Abstract
Scheelite related compounds (A',A '')(n)[(B',B '')O-4](m) with B', B '' = W and/or Mo are promising new materials for red phosphors in pc-WLEDs (phosphor-converted white-light-emitting-diode) and solid-state lasers. Cation substitution in CaMoO4 of Ca2+ by the combination of Na+ and Eu3+, with the creation of A cation vacancies, has been investigated as a factor for controlling the scheelite-type structure and the luminescent properties. Na5Eu(MoO4)(4) and NaxEu(2-x)/33+square(2-x)/3MoO4 (0.138 <= x <= 0.5) phases with a scheelite-type structure were synthesized by the solid state method; their structural characteristics were investigated using transmission electron microscopy. Contrary to powder synchrotron X-ray diffraction before, the study by electron diffraction and high resolution transmission electron microscopy in this paper revealed that Na0.286Eu0.571MoO4 has a (3 + 2)D incommensurately modulated structure and that (3 + 2)D incommensurately modulated domains are present in Na0.200Eu0.600MoO4. It also confirmed the (3 + 1)D incommensurately modulated character of Na(0.138)Eu(0.621)Mo04. The luminescent properties of all phases under near-ultraviolet (n-UV) light have been investigated. The excitation spectra of these phosphors show the strongest absorption at about 395 nm, which matches well with the commercially available n-UV-emitting GaN-based LED chip. The emission spectra indicate an intense red emission due to the D-5(0) -> F-7(2) transition of Eu3+, with local minima in the intensity at Na0.286Eu0.571MoO4 and Na0.200Eu0.600MoO4 for similar to 613 nm and similar to 616 nm bands. The phosphor Na5Eu(MoO4)(4) shows the brightest red light emission among the phosphors in the Na2MoO4-Eu2/3MoO4 system and the maximum luminescence intensity of Na5Eu(MoO4)(4) (lambda(ex) = 395 nm) in the D-5(0) -> F-7(2) transition region is close to that of the commercially used red phosphor YVO4:Eu3+ (lambda(ex) = 326 nm). Electron energy loss spectroscopy measurements revealed the influence of the structure and Na/Eu cation distribution on the number and positions of bands in the UV-optical-infrared regions of the EELS spectrum.