SYNTHESIS OF WATER DISPERSED CdSe/ZnSe TYPE-II CORE-SHELL STRUCTURE QUANTUM DOTS

CdSe/ZnSe core/shell type-II structure quantum dots were prepared by a one-pot synthesis based on a simple solution route. The samples were characterised by UV-Vis spectroscopy and PL spectra. The influence of the reaction time on the optical properties of quantum dots was studied in detail, and the result indicated that reaction time plays an important role in the formation of CdSe/ZnSe type-II quantum dots. The dependence of Cd(2+)/Zn(2+) ratio on the formation of CdSe/ZnSe type-II quantum dots was investigated, too. This result clearly indicates that the Cd(2+) is considerably more reactive than Zn(2+) toward NaHSe, which can indicate that the Zn(2+) concentration can influence the formation rate of CdSe due to the increasing of Cd(2+) releasing rate.