X-RAY INDUCED VISIBLE LUMINESCENCE OF PORPHYRINS |
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| Authors: | Sophia Kokotov Aaron Lewis Ronny Neumann Shmuel Amrusi |
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| Institution: | Department of Applied Physics, Graduate School of Applied Science and Technology, The Hebrew University of Jerusalem, Jerusalem, Israel 91904;Casali Institute of Applied Chemistry, Graduate School of Applied Science and Technology, The Hebrew University of Jerusalem, Jerusalem, Israel 91904 |
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| Abstract: | 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. |
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