Effect of Precursor Molar Ratio of S2-/Zn2+ on Particle Size and Photoluminescence of ZnS:Mn2+ Nanocrystals
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Abstract
We investigate the influence of precursor molar ratio of S2-/Zn2+ on particle size and photoluminescence (PL) of ZnS:Mn2+ nanocrystals. By changing the S2-/Zn2+ ratio from 0.6 (Zn-rich) to 2.0 (S-rich), the particle size increases from nearly 2.7nm to about 4.0nm. The increase in the ratio of S2-/Zn2+ causes a decrease of PL emission intensity of ZnS host while a distinct increase of Mn2+ emission. The maximum intensity for the luminescence of Mn2+ emission is observed at the ratio of S2-/Zn2+≈1.5. The possible mechanism for the results is discussed by filling of S2- vacancies and the increase of Mn2+ ions incorporated into ZnS lattices.
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