Widely used as a fluorescent probe in biological imaging due to its strong two-photon absorption properties. It enables deep-tissue imaging with high resolution and low background noise. Commonly employed in live-cell microscopy to track membrane dynamics and study cellular structures. Its cationic nature allows it to accumulate in mitochondria, making it useful for monitoring mitochondrial function and detecting early signs of apoptosis. Also utilized in photodynamic therapy research as a photosensitizer due to its ability to generate reactive oxygen species upon light excitation. Exhibits good photostability and high quantum yield, suitable for long-term imaging experiments.