Used as a photoacid generator in photopolymerization processes, particularly in advanced lithography for semiconductor manufacturing. Upon exposure to light, it releases acid that initiates polymerization or cross-linking in resist materials, enabling high-resolution patterning. Also employed in organic synthesis as a phosphonium-based reagent for Wittig-type reactions, facilitating carbon-carbon bond formation. Its thermal stability and solubility in organic solvents make it suitable for thin-film applications and optoelectronic device fabrication.