A phosphor is a substance exhibiting luminescence, i.e., emitting light (or other electromagnetic radiation) on nonthermal stimulation. There are two main types: the zinc phosphors, as used on cathode-ray tubes (where stimulation is by electrons); and the oxygen type, as coated on the inside of fluorescent light tubes to convert ultraviolet radiation to visible light. Zinc sulfide is often mixed with cadmium sulphide and a small quantity of metallic phosphates, silicates or fluorides to produce phosphors.
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