In this work, Zn_xCd_1-xS nanocrystalline particles synthesis from aqueous solution is presented. As starting reagents, CdSO₄/Cd(NO₃)₂, ZnSO₄/ Zn(NO₃)₂ and Na₂S₂O₃/ Na₂S were used. A chemical stabilizer was added into the solution aiming to provide a colloidal state of the synthesized nanoparticles, preventing Zn_xCd_1-xS to form clusters. The particles size distribution from the final powders was investigated by laser analysis and by transmission electronic microscopy (TEM), which revealed crystallites of 1.5 – 10 nm diameter. The shape and the crystalline structure of the particles were investigated by transmission electronic microscopy and scanning electronic microscopy (SEM). Thin films containing nanocrystalline cadmium and zinc sulphide are used in photo and electroluminescent cells. Different methods to obtain thin films have been investigated. A high efficient method is the digital deposition (bubble jet), which enables to perform complex configurations with low costs, based on nanocrystalline Zn_xCd_1-xS particles. Other compounds as phosphors ZnS:Cu and ZnS:Cu,Ag exhibit a good UV conversion efficiency into fluorescence emission, applied also in photo and electroluminescent cells.

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