X-ray induced visible luminescence of porphyrins.
A concept has been presented whereby X-ray irradiation can be used to induce visible luminescence of chromophores such as porphyrins. The essential aspects of the idea have been demonstrated in a supramolecular assembly consisting of a water-dispersed polystyrene latex with an embedded scintillating compound, 2,5-diphenyloxazole, and an externally attached hematoporphyrin. X-ray excitation of the assembly yields an emission spectra typical for hematoporphyrin with fluorescent yields of up to 3% with respect to 2,5-diphenyloxazole emission. Significant quenching in the presence of dioxygen indicates that singlet oxygen is formed at atmospheric conditions.
Department of Applied Physics, Hebrew University of Jerusalem, Israel.
S
S
Kokotov
A
A
Lewis
R
R
Neumann
S
S
Amrusi
D006801:Humans; D049449:Luminescence; D009369:Neoplasms / Q000188:drug therapy; D010777:Photochemistry; D010778:Photochemotherapy; D011166:Porphyrins / Q000737:chemistry / Q000528:radiation effects*; D014965:X-Rays
D011166:Porphyrins