Used as a highly efficient photoinitiator in cationic polymerization reactions, particularly in UV-curing systems. It generates strong Brønsted acids upon exposure to light, enabling rapid curing of epoxy and vinyl ether monomers. Commonly applied in advanced coatings, adhesives, and lithographic inks where low-temperature, fast curing is required. Also employed in photoresist technologies and 3D printing due to its high sensitivity and stability in dark conditions.