Used as a precursor in the synthesis of thulium-doped materials for luminescent applications, particularly in optoelectronic devices and phosphors. 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 advanced display technologies and solid-state lasers. Also employed in research settings for studying lanthanide coordination chemistry and magnetic properties due to the well-defined structure and purity it offers.