Tris(cyclopentadienyl)lanthanum is primarily used in the field of organometallic chemistry as a precursor for the synthesis of various lanthanide-based compounds. It serves as a catalyst in polymerization reactions, particularly for the production of specialty polymers with unique properties. This compound is also employed in the development of advanced materials, such as thin films and coatings, which are utilized in electronics and optoelectronics. Additionally, it plays a role in research focused on understanding the behavior of lanthanide complexes in catalytic processes and material science applications.