Used as a fluorescent dye in biological staining and imaging, particularly for membrane labeling in live and fixed cells. Exhibits strong absorption and emission in the near-infrared range, making it suitable for fluorescence microscopy and flow cytometry. Commonly employed in mitochondrial tracking due to its ability to accumulate in negatively charged membranes. Also applied in photodynamic therapy research and as a sensor in optoelectronic devices because of its high quantum yield and photostability.