Fig. 2.

Excitation and emission spectra of PpIX. (a) PpIX in $\mathrm{DMSO}:{\mathrm{H}}_2\mathrm{O}$ ($1:3$) and (b) PpIX in 2% Intralipid. Insert: bean profile of UV excitation used to obtain the emission spectrum of (a) and (b). The peak wavelength of excitation is 405 nm.