The luminescence intensity of Mn2+ in the ZnS:Mn nanoclusters formed in an ultrastable zeolite-Y is seven orders of magnitude stronger than that of other nanoparticles deposited out of solutions. This remarkable effect is attributed to a strong quantum size confinement, the location of Mn2+ ions at the near-surface sites, and good surface passivation. The lowering of the energy loss in the E4(D4 or/and T24(D4) states during the energy transfer from the ZnS host to the emitting state T14(G4) of Mn2+ may also contribute to the observed fluorescence enhancement.
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Chen et al. (2000) studied this question.
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