Used as a host material in phosphors for LED lighting and display technologies due to its ability to efficiently emit light when doped with rare-earth activators such as europium or terbium. It serves in solid-state lasers and optical amplifiers because of its good thermal stability and transparency in the visible and near-infrared range. Employed in specialty glasses and ceramics requiring high resistance to thermal shock and chemical corrosion. Also investigated for use in bioactive coatings for medical implants owing to its biocompatibility and controlled ion release properties.