Influence of the different concentration of Mg in ZnS powder precursor on properties of derived phosphors has been investigated. For this were synthesized ZnS:Cu,Mn phosphors co-doped with different amount of Mg, introduced with MgCl 2 ×6H 2 O. Comparison of properties shows that a small amount of Mg increases the brightness of the photo and electroluminescence. However, further increase in Mg content leads to a sharp decrease in brightness of the electroluminescence and a small shift of the spectrum to the shorter wavelengths.

Influence of some parameters of plasma treatment of initial ZnS powder precursor on properties of derived phosphors has been investigated. for this we processed ZnS powder precursor with different parameters of plasma treatment: gases, different times and electric potentials. Electroluminescent phosphors were then synthesized using treated ZnS and EL devices were fabricated. Plasma treatment increased EL and PL brightness and also increased intensity of green band in emission spectra comparing to blue one.

Abstract— Electron‐beam processing of starting‐material ZnS increased the luminance derived from electroluminescent phosphors. As is shown in the paper, irradiation caused the formation of defects in ZnS that resulted in increased copper content in the phosphor due to the promotion of diffusion and the formation of additional “green” luminescence centers. A change in surface properties was also investigated, and it was found that processing resulted in increased the amount of both surface zinc and sulfur vacancies as well as the amount of surface centers related to copper.