Widely used as a photoredox catalyst in organic synthesis, enabling light-driven reactions such as C–H functionalization and radical additions under mild conditions. Its strong oxidizing power in the excited state makes it effective for electron transfer processes. Commonly applied in polymerization reactions, especially in cationic photopolymerization of epoxides and vinyl ethers, where it acts as a photoacid generator upon irradiation. Also utilized in the development of sensors and luminescent materials due to its favorable photophysical properties. Suitable for use in coatings, inks, and adhesives that cure rapidly under UV or visible light.