Used in the production of yttrium-containing phosphors for cathode ray tubes and LED displays. Serves as a raw material in the synthesis of other yttrium compounds for high-temperature superconductors and ceramics. Employed in dental alloys and restorative materials due to its biocompatibility and durability. Applied in specialty optical coatings and lasers, particularly in solid-state lasers where fluoride-based matrices enhance performance. Also utilized in nuclear reactors as a neutron absorber and in the manufacturing of fluoride glass for fiber optics.