Used as a phosphor in various lighting applications, zinc sulfide emits light when excited by radiation or electrons. It is commonly found in cathode ray tubes, X-ray screens, and glow-in-the-dark products due to its luminescent properties. When doped with elements like copper or silver, it produces different colors of light, making it valuable in electroluminescent panels and display technologies. It also serves as an infrared optical material, transmitting light in the mid-infrared range, useful in optical windows and lenses. In addition, zinc sulfide is employed as a pigment in paints, plastics, and coatings where opacity and brightness are required. Its semiconductor characteristics make it suitable for use in solar cells and photoelectric devices.