LUMINESCENT-GRADE ZINC-SULFIDE PREPARED BY THIOSULFATE METHOD - V - CORRECTION OF THE LUMINESCENCE ABILITY OF ZNS-TYPES BY DIFFERENT ADDITIVES

The different zinc sulphide types obtained by thiosulphate method poss ess variable luminescence abilities which are mostly connected with di fferent desulphuration degrees of the host lattice. The luminescence a bility could be partially corrected by addition of small amounts of zi nc oxide or sulphur into the synthesis mixtures. The optimum additive amounts are of 1.0-1.5 mol % ZnO for mixtures containing ZnSII-type ob tained in intermediate sulphurated atmosphere and of about 3 wt % sulp hur for mixture with ZnSIII-type prepared in weakly sulphurated medium .