Zinc and cadmium sulfides are the most critical basic materials of sulfide-type phosphors. An essential condition of getting highly efficient phosphors is that these sulfides must first be prepared to the highest possible chemical purity before the necessary amount of activator. Some inorganics, such as silver-activated zinc sulfide, are suitable scintillators but cannot be grown in optical-quality large crystals. As a result, their use is limited to thin polycrystalline layers known as phosphor screens. The precipitate is recovered by filtration, then calcined (roasted) at temperatures above 600° C (1,112° F). Zinc sulfide, ZnS, occurs in nature as the mineral sphalerite and may be prepared by treating solutions of zinc salts with hydrogen sulfide. It was long used as a white pigment but has been gradually replaced by titanium dioxide.
Zinc sulfide has luminescent properties. Zinc sulfide in a suitably activated form (i.e., with trace quantities of certain elements) can exhibit fluorescence, phosphorescence, and luminescence. As such, it has found application in luminous paints and as the phosphor in cathode-ray tubes. Sulfide, also spelled sulfide, is any of three classes of chemical compounds containing the element sulfur. The three courses of sulfides include inorganic sulfides, organic sulfides (sometimes called thioethers), and phosphine sulfides. Inorganic sulfides are ionic compounds containing the negatively charged sulfide ion, S2−; these compounds may be regarded as salts of the very weak acid hydrogen sulfide. Organic sulfides are compounds in which a sulfur atom is covalently bonded to two organic groups. Phosphine sulfides are formed from the reaction of organic phosphines with sulfur, in which the sulfur atom is linked to the phosphorus by a bond that has covalent and ionic properties. If you are looking for high quality, high purity, and cost-effective zinc sulfide, or if you require the latest price of zinc sulfide, please feel free to email contact mis-asia.
