Used in the preparation of near-infrared fluorescent dyes for bioimaging and labeling of cells and tissues. Commonly applied in fluorescence microscopy and flow cytometry due to its strong absorption and emission in the NIR range, allowing deeper tissue penetration and reduced background autofluorescence. Also utilized in the development of optical sensors and as a photosensitizer in photodynamic therapy research. Its lipophilic nature enables easy cell membrane penetration, making it suitable for live-cell imaging. Additionally, it serves as a spectral sensitizer in photographic emulsions and imaging devices.