Near-Field Study of Hot Spot Photoluminescence Decay in ZnS:Mn Nanoparticles

Abstract:

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The local spatial distribution of photoluminescence due to the creation of hot luminescence centers was measured in the optical near-field by Scanning near-field optical microscope at emission peaks of materials (λ =595nm), which is due to the luminescence of Mn2+ in ZnS. The excitation bandgap of ZnS forms exitons, and these excitons get the center of Mn2+ through nonradiation dominates, by means of transition of 4T1 – 6A1 luminescence. This spectrum is evidence that Mn2+ has been incorporated into the ZnS nanoparticles. In comparison with the bulk ZnS:Mn phosphors these nanoparticles have clearly higher luminescent efficiency with its luminescent decay time at least 4 orders of magnitude slower. It means that the oscillator intensity of luminescent centers in ZnS:Mn nanocrystal enhances at least 4 orders of magnitude than that in corresponding bulk ZnS:Mn.

Info:

Periodical:

Materials Science Forum (Volumes 567-568)

Edited by:

Pavel Šandera

Pages:

241-244

DOI:

10.4028/www.scientific.net/MSF.567-568.241

Citation:

L. Grmela et al., "Near-Field Study of Hot Spot Photoluminescence Decay in ZnS:Mn Nanoparticles", Materials Science Forum, Vols. 567-568, pp. 241-244, 2008

Online since:

December 2007

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$35.00

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