Abstract
Zinc sulphide phosphor fired at 900° C was found to exhibit cubic structure while (Zn, Cd)S phosphors containing appreciable amounts of CdS crystallized only in the hexagonal structure under all ordinary circumstances. In contrast, the lattice constants a and c for hexagonal form increased with increasing CdS concentrations in the (Zn, Cd)S solid solutions. Cathodoluminescence emission spectra, at room temperature, for silver-activated (Zn, Cd)S phosphors revealed that all phosphors with any Zn/Cd ratio are single band emitters. The emission band shifted monotonically to lower energies with increasing replacement of zinc by cadmium in the host lattice of the (Zn, Cd)S solid solution phosphors.
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