Used in the production of luminescent materials for display technologies and lighting, particularly in green phosphors for cathode-ray tubes and fluorescent lamps. Serves as a precursor in the synthesis of terbium-doped materials for optical applications, including lasers and fiber optics. Employed in research for developing magnetic and magneto-optical materials due to terbium’s strong paramagnetic properties. Also utilized in bioimaging and biomedical assays as a fluorescent probe because of its long luminescence lifetime and sharp emission peaks.