INFLUENCE OF THE GROWTH-CONDITIONS ON THE PROPERTIES OF CAS-EU ELECTROLUMINESCENT THIN-FILMS

A detailed study of the structural, compositional and optical properti es of electron beam deposited CaS:Eu electroluminescent devices is pre sented. Specific attention is paid to the influence of H2S addition - applied for the first time - and Se coevaporation during the phosphor film deposition. Upon addition of H2S or Se, the crystallinity of the layers improves, the oxygen contamination decreases and the surface ro ughness increases. Finally, the electroluminescent characteristics are correlated with the results of the structural analysis.