Strontium oxide is used in the production of cathode ray tubes (CRTs) and fluorescent lighting, where it contributes to electron emission properties when incorporated into materials. It is commonly employed in ceramics and glass manufacturing to enhance hardness, durability, and optical properties such as refractive index. As a strong basic oxide, it acts as a drying agent for solvents in laboratory settings and can absorb CO2 to form strontium carbonate. It serves as a precursor for strontium-based phosphors in electronic components and color television screens. Note: Strontium compounds like strontium chloride are used in toothpaste for sensitive teeth, but not the oxide itself.