Used as a fluorescent dye in biological staining and imaging due to its strong emission in the red to near-infrared range. It is particularly effective for visualizing cellular structures and tracking biomolecules in live-cell imaging. Its high photostability and low toxicity make it suitable for long-term fluorescence studies. Also employed in forensic science for fingerprint detection on porous surfaces, where it binds to trace proteins and lipids, enhancing visibility under UV or laser light. Additionally, it serves as a sensitizer in some photodynamic therapy applications and in the development of optical sensors for environmental monitoring.