Photon energy upconversion in porphyrins: one-photon hot-band absorption versus two-photon absorption
We study the porphyrin S1 → S0 fluorescence and the photosensitized singlet oxygen 1Δg → 3∑g phosphorescence, both originating from absorption of photons with energy less than the porphyrin S0 → S1 transition energy. By measuring the excitation intensity dependence of fluorescence at lowered sample...
Main Authors: | , , , , , |
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Format: | Journal article |
Language: | English |
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2003
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author | Drobizhev, M Karotki, A Kruk, M Krivokapic, A Anderson, H Rebane, A |
author_facet | Drobizhev, M Karotki, A Kruk, M Krivokapic, A Anderson, H Rebane, A |
author_sort | Drobizhev, M |
collection | OXFORD |
description | We study the porphyrin S1 → S0 fluorescence and the photosensitized singlet oxygen 1Δg → 3∑g phosphorescence, both originating from absorption of photons with energy less than the porphyrin S0 → S1 transition energy. By measuring the excitation intensity dependence of fluorescence at lowered sample temperatures, we are able to discriminate between two parallel processes of one-photon hot-band absorption (HBA) and simultaneous two-photon absorption (TPA). When the HBA and TPA contributions are comparable in magnitude, we use this new method to determine absolute TPA cross-section. We also demonstrate for the first time a singlet oxygen photosensitization via HBA in porphyrin. © 2003 Elsevier Science B.V. All rights reserved. |
first_indexed | 2024-03-07T01:27:19Z |
format | Journal article |
id | oxford-uuid:92683e70-8168-4577-ae58-03c2edc431a6 |
institution | University of Oxford |
language | English |
last_indexed | 2024-03-07T01:27:19Z |
publishDate | 2003 |
record_format | dspace |
spelling | oxford-uuid:92683e70-8168-4577-ae58-03c2edc431a62022-03-26T23:25:19ZPhoton energy upconversion in porphyrins: one-photon hot-band absorption versus two-photon absorptionJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:92683e70-8168-4577-ae58-03c2edc431a6EnglishSymplectic Elements at Oxford2003Drobizhev, MKarotki, AKruk, MKrivokapic, AAnderson, HRebane, AWe study the porphyrin S1 → S0 fluorescence and the photosensitized singlet oxygen 1Δg → 3∑g phosphorescence, both originating from absorption of photons with energy less than the porphyrin S0 → S1 transition energy. By measuring the excitation intensity dependence of fluorescence at lowered sample temperatures, we are able to discriminate between two parallel processes of one-photon hot-band absorption (HBA) and simultaneous two-photon absorption (TPA). When the HBA and TPA contributions are comparable in magnitude, we use this new method to determine absolute TPA cross-section. We also demonstrate for the first time a singlet oxygen photosensitization via HBA in porphyrin. © 2003 Elsevier Science B.V. All rights reserved. |
spellingShingle | Drobizhev, M Karotki, A Kruk, M Krivokapic, A Anderson, H Rebane, A Photon energy upconversion in porphyrins: one-photon hot-band absorption versus two-photon absorption |
title | Photon energy upconversion in porphyrins: one-photon hot-band absorption versus two-photon absorption |
title_full | Photon energy upconversion in porphyrins: one-photon hot-band absorption versus two-photon absorption |
title_fullStr | Photon energy upconversion in porphyrins: one-photon hot-band absorption versus two-photon absorption |
title_full_unstemmed | Photon energy upconversion in porphyrins: one-photon hot-band absorption versus two-photon absorption |
title_short | Photon energy upconversion in porphyrins: one-photon hot-band absorption versus two-photon absorption |
title_sort | photon energy upconversion in porphyrins one photon hot band absorption versus two photon absorption |
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