Laser-synthesized Y 2 O 3 :Eu 3+ nanophosphors and their stabilization in water suspensions
| Autor: | M. Lezhnina, Ulrich Kynast, M. G. Ivanov, I. V. Krutikova, I. S. Puzyrev |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
chemistry.chemical_element Mineralogy Nanoparticle 02 engineering and technology 010402 general chemistry 01 natural sciences Dispersant law.invention Suspension (chemistry) Inorganic Chemistry law Calcination Electrical and Electronic Engineering Physical and Theoretical Chemistry Spectroscopy Organic Chemistry Green body Yttrium 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry Chemical engineering 0210 nano-technology Europium Monoclinic crystal system |
| Zdroj: | Optical Materials. 74:67-75 |
| ISSN: | 0925-3467 |
| DOI: | 10.1016/j.optmat.2017.02.031 |
| Popis: | Europium doped yttrium oxide nanophosphors (Y 2 O 3 doped with 5% Eu 3+ ), which consists of spherical single-phase monoclinic particles with an average size of 17 nm, was prepared by laser synthesis. While the monoclinic material has a low efficiency of only 19% of a μm-sized commercial Y 2 O 3 :Eu product, the cubic phase after calcination at 900 °C achieves 68% despite the remaining hydroxo-groups at the surface and still small crystallite size (56 nm). An ethanolammonium salt of citric acid (Dolapix CE64) was used as a dispersant in water suspension. To estimate the stability of the dispersed phase, the electrokinetic potential and agglomerate sizes were measured as a function of pH. With this dispersant, a 30 wt% nanopowder water suspension, showing a Newtonian viscosity of about 6 mPa × s, was obtained. Maximum content of the nanopowder of about 60 wt% can be accomplished in the slurry, still fluid enough to be used to cast a highly uniform and dense ceramic green body to sinter nanostructured Y 2 O 3 :Eu 3+ phosphors ceramics. |
| Databáze: | OpenAIRE |
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