By a News Reporter-Staff News Editor at Clinical Trials Week -- Investigators discuss new findings in Clinical Research. According to news originating from Oslo, Norway, by NewsRx correspondents, research stated, "We present a comparative study of the 1.54 mu m photoluminescence (PL) from A1(2)O(3):(Er, Si) and Al2O3:( Er, Ge) films co-sputtered on Si substrates using a composite target. The PL yield of Si- and Ge- doped films subjected to different thermal treatment in the range 500-1100 degrees C is referenced against that of a control A1(2)O(3):(Er) structure."
Our news journalists obtained a quote from the research from Foundation for Scientific and Industrial Research, "The Er-related emission reaches maximum upon annealing at 700 degrees C for the Al2O3:(Er, Si) and 500 degrees C for the Al2O3:(Er, Ge) films, in both cases decreasing at higher annealing temperatures. Ge co-doped films are found to be approximately 20 times less luminous than the reference Al2O3:(Er) structure, whereas Si co-doping leads to greatly enhanced emission at 1.54 lm. By adapting energy filtered transmission electron microscopy (EFTEM), the presence of similar to 2 nm Si nanoclusters was revealed, whereas no indications of Ge clusters or crystals could be observed implying that mere presence of Ge in the Al2O3 matrix can dramatically reduce the luminescence efficiency."
According to the news editors, the research concluded: "We discuss the possible reasons for not forming the Ge nanoclusters in the Al2O3 host and the apparent quenching of the Errelated emission."
For more information on this research see: A comparative study of 1.5 mu m photoluminescence from (Er, Si) and (Er, Ge) co-sputtered with Al2O3 on Si. Journal of Alloys and Compounds, 2014;590():5-8. Journal of Alloys and Compounds can be contacted at: Elsevier Science Sa, PO Box 564, 1001 Lausanne, Switzerland. (Elsevier - www.elsevier.com; Journal of Alloys and Compounds - www.elsevier.com/wps/product/cws_home/522468)
The news correspondents report that additional information may be obtained from J. Mayandi, SINTEF Mat & Chem, NO-0314 Oslo, Norway. Additional authors for this research include T.G. Finstad, S. Foss, A. Galeckas and M. Stange (see also Clinical Research).
Keywords for this news article include: Oslo, Norway, Europe, Nanoclusters, Nanotechnology, Clinical Research, Emerging Technologies, Clinical Trials and Studies
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