Coumarin 6H is widely used as a fluorescent dye in various scientific and industrial applications. Its strong fluorescence properties make it valuable in biological imaging, where it helps in tracking and visualizing cellular processes. It is also employed in laser dyes, particularly in tunable dye lasers, due to its ability to emit light in the visible spectrum. Additionally, Coumarin 6H is utilized in organic light-emitting diodes (OLEDs) and as a sensitizer in solar cells to enhance light absorption efficiency. Its applications extend to analytical chemistry, where it serves as a fluorescent probe for detecting and quantifying specific molecules.