Search results for "Site-selective spectroscopy"

showing 4 items of 4 documents

Ordering of fluorite-type phases in erbium-doped oxyfluoride glass ceramics

2018

In this study, novel transparent Er3+ doped glass ceramics were prepared from melt-quenched oxyfluoride glasses with general composition of Na2O-NaF-BaF2-YbF3-Al2O3-SiO2. The crystallization of fluorite (BaF2, BaF2-YbF3, NaF-BaF2-YbF3 and Na0.5-xYb0.5+xF2+2x) and distorted fluorite (rhombohedral Ba4Yb3F17 and tetragonal NaF-BaF2-YbF3) phases was analysed in glass ceramics with different BaF2 and YbF3 ratio. The phase composition and microstructure were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Intense red upconversion luminescence (UCL) was detected under near-infrared excitation resulting from three photon upconversion followed by cross-relaxation betw…

Materials scienceBa4Yb3F17Scanning electron microscopeGlass ceramicsNucleationMineralogy02 engineering and technology010402 general chemistry01 natural sciencesFluoritelaw.inventionTetragonal crystal systemlaw:NATURAL SCIENCES:Physics [Research Subject Categories]Materials ChemistryCrystallizationPhase transitionSite-selective spectroscopyDoping021001 nanoscience & nanotechnologyMicrostructurePhoton upconversion0104 chemical sciencesCrystallographyCeramics and Composites0210 nano-technologyUpconversionJournal of the European Ceramic Society
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Cubic and rhombohedral Ba4Lu3F17:Er3+ in transparent glass ceramics: Crystallization and upconversion luminescence

2018

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LuminescenceMaterials scienceGlass ceramicsBiophysicsAnalytical chemistry02 engineering and technology01 natural sciencesBiochemistrylaw.inventionlaw0103 physical sciencesActivator (phosphor):NATURAL SCIENCES:Physics [Research Subject Categories]CeramicCrystallizationThermal analysis010302 applied physicsSite-selective spectroscopyBa4Lu3F17General Chemistry021001 nanoscience & nanotechnologyCondensed Matter PhysicsAtomic and Molecular Physics and OpticsPhoton upconversion3. Good healthNanocrystalvisual_artvisual_art.visual_art_mediumCrystallite0210 nano-technologyLuminescenceUpconversionJournal of Luminescence
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Upconversion luminescence in transparent oxyfluoride glass ceramics containing hexagonal NaErF4

2019

The authors wish to express gratitude to K. Smits for TEM measurements. This research is funded by the Latvian Council of Science, project “Novel transparent nanocomposite oxyfluoride materials for optical applications”, project No. LZP-2018/1-0335. GK wishes to expresses gratitude to Arnis Riekstins "MikroTik" donation. Donations are administered by the University of Latvia Foundation. © 2019. This work is licensed under a CC BY-NC-ND 4.0 license.

Materials scienceGlass ceramicsAnalytical chemistry02 engineering and technology010402 general chemistry01 natural sciences7. Clean energyIonMaterials Chemistry:NATURAL SCIENCES:Physics [Research Subject Categories]CeramicSpectroscopyOxyfluorideSite-selective spectroscopyMechanical EngineeringMetals and AlloysRate equation021001 nanoscience & nanotechnologyPhoton upconversion0104 chemical sciencesMicrocrystallineNanocrystalMechanics of MaterialsTransmission electron microscopyvisual_artvisual_art.visual_art_medium0210 nano-technologyNaErF4Upconversion
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Upconversion luminescence of Er3 +/Yb3 + and their role in the stabilization of cubic NaLaF4 nanocrystals in transparent oxyfluoride glass ceramics

2018

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Materials scienceGlass ceramicsMineralogy02 engineering and technologyCrystal structure010402 general chemistry7. Clean energy01 natural sciencesFluoritelaw.inventionlawPhase (matter)Materials Chemistry:NATURAL SCIENCES:Physics [Research Subject Categories]CrystallizationOxyfluorideSite-selective spectroscopyDoping021001 nanoscience & nanotechnologyCondensed Matter PhysicsPhoton upconversion3. Good health0104 chemical sciencesElectronic Optical and Magnetic MaterialsCrystallographyNanocrystalNaLaF4Ceramics and CompositesCrystallite0210 nano-technologyUpconversion
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