C. Onose, C. S. Onose, S. Jinga, M. Elisa, H. Niciu, C. Grigorescu, I. C. Vasiliu, The synthesis of luminiscent nanoparticles from aqueous solutions, J. Optoelectron. Adv. Mater., 9/5 (2007) 1534-1539


Title: The synthesis of luminiscent nanoparticles from aqueous solutions

Abstract: The paper is an experimental study on obtaining method of nanocrystalline ZnxCd1-xS from aqueous solution. The inorganic ternary compound is used as a pigment, phosphors and semiconductor material. We have investigated the dependence of ZnxCd1-xS nanoparticles size and properties on composition, pH and concentration of the starting solution. The method consists in co-precipitation of ZnxCd1-xS from CdSO4/ Cd(NO3)(2) and ZnSO4/ Zn(NO3)(2) solutions, by adding an exceeding amount of Na2S at high pH of the solution. The precipitation reaction takes place in the presence of a chemical stabilizer as styrene-maleic anhydride or acrylic acid-maleic anhydride co-polymers. The stabilizer provides a colloidal state of the synthesized material and does not allow ZnxCd1-xS nanoparticles to agglomerate. This ternary compound has a high conversion efficiency of the excitation energy into visible light, applied in photo and electroluminescent cells.

Key words: luminescent nanoparticles; Zn-Cd-S; energy conversion; electroluminescent cell