By a News Reporter-Staff News Editor at Journal of Technology -- Research findings on Materials Science are discussed in a new report. According to news reporting originating in Jena, Germany, by VerticalNews journalists, research stated, "A new method of synthesizing spherical nanoparticles with photoluminescent spinel structures using a CO2 laser co-vaporization technique (CoLAVA) is presented. The method applies homogeneous mixtures of oxidic precursors such as Al2O3, SrO and Eu2O3 and allows the fabrication of quantities exceeding 10 g h(-1)."
The news reporters obtained a quote from the research from the University of Jena, "During the CoLAVA process, the educt oxides are reacted by a gas phase condensation yielding amorphous spherical particles with diameters ranging from 10 to 100 nm. The as-prepared materials exhibit red emission at 625 nm (1.98 eV) due to the incorporated Eu3+. Temperature treatment up to 1200 degrees C under a reducing atmosphere yielded crystalline particles of the same size, which were slightly sintered. These particles consisted of >90 wt.% SrAl2O4 with minor fractions of Sr3Al2O6 and SrCO3. The amount of the SrAl2O4 spinel increased with increasing temperature, whereas the accompanying phases were decreased. A strong green emission centered at 525 nm (2.36 eV) detected at RT was observed at an onset temperature of 900 degrees C, which is due to the presence of Eu2+ in the crystal lattice of SrAl2O4. The red emission was not observed at higher annealing temperatures."
According to the news reporters, the research concluded: "The CoLAVA method represents a fast and facile route for the fabrication of nano- to microstructured phosphor materials for a variety of engineering applications."
For more information on this research see: Synthesis of Eu-doped SrAl2O4 nanophosphors by CO2 laser vaporization. Acta Materialia, 2013;61(19):7133-7141. Acta Materialia can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England. (Elsevier - www.elsevier.com; Acta Materialia - www.elsevier.com/wps/product/cws_home/221)
Our news correspondents report that additional information may be obtained by contacting C. Zollfrank, University of Jena, Otto Schott Inst Mat Res, D-07741 Jena, Germany. Additional authors for this research include S. Gruber, M. Batentschuk, A. Osvet, F. Goetz-Neunhoeffer, S. Dittrich, J. Grabow, H.D. Kurland and F.A. Muller.
Keywords for this news article include: Jena, Europe, Germany, Materials Science
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