“…52 The excellent optical properties and easy synthetic modification of BODIPYs make them the most studied fluorophore, and they have been used as a potential candidate in dye-sensitized solar cells, sensors, photosensitizers, fluorescent switches, nonlinear optics, photodynamic therapy (PDT), laser dyes, light harvesting and bioimaging applications. 53–60 Normal BODIPYs exhibit an absorption in the green spectral region (about 500 nm), which is not appropriate for in vivo PDT. Alternatively, near-IR absorption is desired for in vivo PDT because light with such wavelengths enables deeper tissue penetration.…”