Used as a highly effective photoinitiator in radical polymerization reactions, especially in UV-curable systems. It enables rapid curing of coatings, inks, and adhesives under visible or near-UV light, even in low-intensity or ambient conditions. Its strong absorption in the visible range and high efficiency in generating free radicals make it suitable for dental composites, 3D printing resins, and clear coatings where deep penetration of light and minimal yellowing are critical. Also valued in oxygen-inhibited environments due to its ability to sustain polymerization in the presence of air.