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X‐RAY INDUCED VISIBLE LUMINESCENCE OF PORPHYRINS
Author(s) -
Kokotov Sophia,
Lewis Aaron,
Neumann Ronny,
Amrusi Shmuel
Publication year - 1994
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1994.tb05052.x
Subject(s) - luminescence , hematoporphyrin , photochemistry , chromophore , quenching (fluorescence) , singlet oxygen , polystyrene , fluorescence , chemistry , emission spectrum , irradiation , supramolecular chemistry , porphyrin , oxygen , materials science , spectral line , optoelectronics , optics , molecule , organic chemistry , polymer , physics , photodynamic therapy , nuclear physics , astronomy
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‐diphenyloxa‐zole, 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.