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We report on the unique luminescent properties of ZnS nanoparticles co-activated by Cu 2+ and rare-earth metallic ions. The co-activated ZnS nanocrystals with varying sizes from 20 to 30Å have been prepared by using a chemical coprecipitation at room temperature. The nanoparticles can be co-doped with copper and rare-earth metallic ions during synthesis without altering X-ray diffraction...
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