Used as a precursor in the synthesis of luminescent materials and phosphors, particularly in optoelectronic devices. Employed in research for doping scintillation crystals that detect radiation due to lutetium's high density and thermal neutron absorption. Serves as a catalyst in organic reactions, especially in esterification and condensation processes. Applied in analytical chemistry as a reagent for trace metal analysis. Investigated for use in medical imaging and radiotherapy due to the favorable nuclear properties of lutetium isotopes. Also utilized in the preparation of other lutetium-based compounds for advanced ceramic and glass materials.