Zinc sulfide electroluminophores as well as processes for their preparation

A process for producing a fine grained EL phosphor comprising the steps of: DOLLAR A 1. Preparation of a fine-grained zinc sulphide by precipitating zinc sulphide from the solutions of suitable zinc sulfide salts with H2S. DOLLAR A 2. mixing the obtained ZnS crystallites with required for forming phosphor activators and co-activators. DOLLAR A 3. annealing the resulting mixture at temperatures below 1000 ° C in the presence of fluxes using fluoridic and / or bromidischen and / or jodidischen melting agents. DOLLAR A 4. treating the obtained according to step 3 pulverulent electroluminophors means of organic and / or inorganic acids in an acid bath with stirring. DOLLAR A 5. washing, neutralization and drying of the obtained powdery electroluminophores.