Used as a photoacid generator in photopolymerization processes, particularly in UV-curable coatings, inks, and resins. Upon exposure to light, it releases strong acid that initiates polymerization, making it valuable in advanced lithography for microelectronics and in dental composites. Also serves as an arylating agent in organic synthesis, transferring phenyl groups to various substrates under mild conditions. Its stability and reactivity make it suitable for use in radical reactions and as a precursor in the preparation of hypervalent iodine-based catalysts.