Used as a dopant in phosphors for cathode ray tubes and fluorescent lamps, enhancing light emission efficiency. Employed in the production of fluoride glass for fiber optics due to its low phonon energy and high transparency in the ultraviolet to infrared range. Acts as a catalyst in automotive exhaust systems to reduce harmful emissions. Utilized in research for solid-state batteries as a component in electrolytes for improved ionic conductivity. Also applied in the synthesis of cerium-doped materials for scintillation detectors in radiation measurement.