Used in research and development of luminescent materials due to its strong emission in the near-infrared region, making it suitable for optical sensors and imaging systems. Employed in the synthesis of other thulium-containing compounds for specialized catalysts and in doping crystals for solid-state lasers. Also investigated for use in portable X-ray devices and medical imaging technologies owing to its ability to emit X-rays when bombarded with electrons. Its hydrated form facilitates easier handling and solubility in aqueous reactions, beneficial for laboratory-scale preparations. Additionally, it plays a role in low-temperature magnetism research for advanced magnetic materials.