Used primarily as a photoinitiator in UV-curable systems, this compound plays a key role in polymer chemistry. It efficiently generates free radicals upon exposure to ultraviolet or visible light, making it suitable for initiating polymerization in coatings, inks, and adhesives. Its high bromine content enhances intersystem crossing, improving radical generation efficiency. It is especially effective in radical and hybrid curing systems where deep cure and fast reaction kinetics are required. Due to its xanthene backbone, it also exhibits good thermal stability and light absorption in the near-UV range, allowing for efficient use in layered or pigmented formulations.