Photoluminescent properties of ZnS:Mn nanocrystals prepared in inhomogeneous system

ZnS:Mn nanocrystalline colloids and powders were prepared by chemical method with H,S gas in an inhomogeneous system of gas-liquid phase. The best reactive conditions were determined. The structure and the properties of the materials were examined by X-ray diffraction (XRD) and infrared (IR) spectroscopy. From the PLE and PL spectra of ZnS:Mn nanocrystals, it is shown that the Mn2+ ions are incorporated into the ZnS host structure. The position of the characteristic peaks in the PLE spectra of ZnS:Mn nanocrystal sol or powders shift to higher energy under UV exposure, and are different from those of ZnS:Mn bulk materials. The emission sites of ZnS:Mn nanocrystal sol and powders are different from the bulk materials, but the emission sites of nanocrystal powders are the same as those of nanocrystal sol. (C) 2002 Elsevier Science B.V. All rights reserved.