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Enhancement of luminescent properties of ZnS:Mn nanophosphors by controlled ZnO capping

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3 Author(s)
Karar, N. ; Electronic Materials Division, National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110012, India ; Chander, Harish ; Shivaprasad, S.M.

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.1815059 

Results of a method is presented for synthesizing ZnS:Mn nanoparticles capped in situ by ZnO. Analysis of Raman spectra and x-ray photoelectron spectra results have reinforced claim of the formation of ZnO capping layer on the surface of ZnS:Mn nanoparticles. Raman spectra results also showed presence of stress at an optimum ZnO capping thickness. In brief, the only variation within samples is in their ZnO capping thickness. Phase formation was analyzed and confirmed from powder x-ray diffraction. ZnS:Mn particle size is about 4 nm. The change in photoluminescent properties with ZnO capping thickness variation is presented. It is shown that the variation in ZnO thickness and the resultant stress leads to an enhanced photoluminescence intensity/efficiency of nano-ZnS:Mn.

Published in:

Applied Physics Letters  (Volume:85 ,  Issue: 21 )

Date of Publication:

Nov 2004

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