By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Nanoparticles. According to news reporting originating from Tartu, Estonia, by NewsRx correspondents, research stated, "Zinc sulfide, both as a bulk material and in nanocrystalline form, is a valuable luminescent material with important applications. Doped ZnS nanoparticles of around 5 nm are the material of choice for optoelectronic applications running in the UV region owing to their significant quantum size effect."
Our news editors obtained a quote from the research from the University of Tartu, "This paper concerns detailed structural, spectroscopic and crystal field studies of ZnS nanoparticles, both pure and doped with Mn2+ ions, successfully synthesized at room temperature using a simple reverse micelle technique in the Triton X-100/cyclohexane medium. The resulting ZnS sphalerite phase smallsize nanoparticles (3-5 nm) have a much larger energy band gap ( similar to 4.7 eV) than that reported for the bulk ZnS (3.6 eV), thus confirming a pronounced quantum confinement effect. The electron paramagnetic resonance data provided evidence for the existence of two distinct environments for Mn2+ ions: the interior (core) and near the surface of the nanoparticles. The presence of an Mn2+-characteristic orange emission centered at 600 nm confirmed that our sample's were properly doped with Mn2+ ions, as the T-4(1)- >(6)A(1) radiation transition could arise only on the basis of Mn2+ ions incorporated into the ZnS nanoparticles. To the best of our knowledge, our finding include the longest decay time component for the orange emission ever observed, timed at about 3.3 ms. The experimental excitation spectra were analyzed and the transitions assigned using the exchange charge model of theory of crystal field, which allowed to calculate the energy level scheme of the Mn2+ ions."
According to the news editors, the research concluded: "The results presented in this paper provide us with detailed information about the ZnS sphalerite nanocrystals studied and can be readily applied to other similar systems."
For more information on this research see: Structural, optical and crystal field analyses of undoped and Mn2+-doped ZnS nanoparticles synthesized via reverse micelle route. Journal of Luminescence, 2014;146():133-140. Journal of Luminescence can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Journal of Luminescence - www.elsevier.com/wps/product/cws_home/505700)
The news editors report that additional information may be obtained by contacting R.M.K. Whiffen, University of Tartu, Inst Phys, EE-51014 Tartu, Estonia. Additional authors for this research include D.J. Jovanovic, Z. Antic, B. Bartova, D. Milivojevic, M.D. Dramicanin and M.G. Brik (see also Nanoparticles).
Keywords for this news article include: Tartu, Europe, Estonia, Nanotechnology, Emerging Technologies
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