Used as a fluorescent dye in laser dyes, particularly in dye lasers operating in the near-infrared region. It serves as a spectral sensitizer in solar cells to enhance light absorption and improve efficiency. Commonly employed in fluorescence microscopy and biological staining due to its strong emission and photostability. Also utilized in environmental tracing to monitor water flow and detect leaks in geological systems. Its high quantum yield makes it suitable for use in optical sensors and photonic devices.