Used primarily as a photoinitiator in UV-curing systems, enabling rapid polymerization of inks, coatings, and adhesives upon exposure to ultraviolet light. Its strong absorption in the near-UV range makes it effective in clear and pigmented formulations. Commonly found in printing inks, electronics encapsulation, and dental composites where deep cure and low yellowing are required. Also employed as a photosensitizer in photodynamic therapy research and in organic synthesis to facilitate photochemical reactions.