Coumarin 478 is widely used as a fluorescent dye in various industrial and scientific applications. It is commonly employed in the production of optical brighteners for textiles, paper, and detergents, where it enhances the appearance of whiteness and brightness. In the field of biochemistry, it serves as a fluorescent marker for tracking and imaging biological molecules, aiding in research and diagnostic processes. Additionally, it is utilized in the manufacturing of solar cells and organic light-emitting diodes (OLEDs) due to its efficient light-emitting properties. Its stability and fluorescence make it a valuable component in analytical chemistry for detecting and quantifying substances in complex mixtures.