Used in superconductors, particularly in combination with barium and copper oxides (e.g., YBCO), enabling high-temperature superconductivity for powerful magnets in MRI machines and magnetic levitation systems. Key component in phosphors for color television screens, LED displays, and fluorescent lamps, where it produces red luminescence when doped with europium. Employed in laser materials, such as yttrium aluminum garnet (YAG) crystals, which are used in industrial cutting, welding, and medical lasers. Added to alloys to improve strength, workability, and resistance to high-temperature oxidation, especially in aerospace and electronic applications. Utilized in cancer treatment through yttrium-90, a radioactive isotope used in targeted radiation therapy for liver tumors and certain types of lymphoma. Used in ceramic and glass materials to enhance thermal stability and resistance to cracking under thermal stress.