Used as a photosensitizer in photodynamic therapy and imaging applications due to its strong absorption in the visible light range and ability to generate reactive oxygen species upon light activation. Commonly applied in biological staining for fluorescence microscopy, especially for tracking cellular structures and monitoring membrane dynamics. Also utilized in the development of optical sensors and dye-sensitized solar cells because of its stable and intense coloration. Its ionic nature enhances solubility in polar solvents, making it suitable for solution-based processing in optoelectronic devices.