Used as a phosphor in various applications such as cathode ray tubes, X-ray screens, and glow-in-the-dark products due to its luminescent properties when doped with activators like copper or silver. Commonly employed in electroluminescent panels and lighting devices. Also serves as a pigment in paints, plastics, and coatings where opacity and brightness are required. Utilized in some semiconductor applications and infrared optical windows because of its transparency in the infrared spectrum. Found in certain types of solar cells and photocatalytic systems for energy conversion and environmental remediation.