Used primarily as a photoinitiator in UV-curable systems, this compound plays a key role in polymer chemistry. It is especially effective in free-radical polymerization reactions triggered by ultraviolet or visible light. Common applications include inks, coatings, adhesives, and dental resins, where rapid curing under light exposure is required. Its ability to absorb light in the long-wavelength UV to visible range makes it suitable for formulations needing deep cure penetration and reduced oxygen inhibition. Often combined with co-initiators like tertiary amines to enhance efficiency.