Photoluminescence enhancement of ZnS : Mn nanoparticles by SiO2 coating

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DOIResolve DOI: http://doi.org/10.1016/j.jallcom.2007.09.082
AuthorSearch for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of Alloys and Compound
Volume455
Issue1-2
Pages519523; # of pages: 5
SubjectChemical synthesis; Impurities in semiconductors; Luminescence; Phosphors; X-ray diffraction
AbstractZnS:Mn nanoparticles (~3.1?nm) of a cubic structure were prepared by a coprecipitation method and then dispersed with various weights (0.5-8?g) into a solution containing ammonium hydroxide, ethanol and tetraethyl orthosilicate (TEOS) for surface coating. X-ray diffraction (XRD) analysis of these coated ZnS:Mn powders revealed the presence of amorphous materials after the coating process. Characterization of the coated powders using a transmission electron microscope (TEM) and an electron energy loss spectrometer (EELS) showed that ZnS:Mn nanoparticles were randomly embedded in the larger particles of amorphous SiO2 (50-100?nm). The optical properties of photoluminescence (PL) and diffuse reflection of the SiO2-coated ZnS:Mn powders were found to depend on the quantity of ZnS:Mn nanoparticles in the coating solution. The increased PL intensity of ZnS:Mn at 590?nm after SiO2 coating was proposed to result from the inhibition of excitation energy transfer to quenching centers or surface states based on the observation of the reduced absorption in the region of 370-450?nm.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
NPARC number12328231
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Record identifier6c41af39-461c-4c86-b815-fb2f834bfc38
Record created2009-09-10
Record modified2016-05-09
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