Hematoporphyrin oligomers in cetyl trimethyl ammonium bromide (CTAB) micellar solution were irradiated by an argon laser. The spectroscopic property of the solution before and after the photoirradation was investigated by the measurements of spectra of fluorescence and triplet-triplet (Tn-Ti) absorption, and lifetimes of the excited singlet and triplet stats. From the results, the irradiated oligomers were concluded to form stable aggregates which would be photoactive sensitizers.
