Used as a precursor in the preparation of thulium-doped materials for luminescent applications, particularly in optoelectronic devices and solid-state lasers. Its high volatility and thermal stability make it suitable for chemical vapor deposition (CVD) processes, where thin films of thulium-containing oxides are deposited for use in phosphors and display technologies. Also employed in research settings for the synthesis of advanced nanomaterials with magnetic and optical functionalities.