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...

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Main Authors: Drobizhev, M, Karotki, A, Kruk, M, Krivokapic, A, Anderson, H, Rebane, A
Format: Journal article
Language:English
Published: 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.
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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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AT karotkia photonenergyupconversioninporphyrinsonephotonhotbandabsorptionversustwophotonabsorption
AT krukm photonenergyupconversioninporphyrinsonephotonhotbandabsorptionversustwophotonabsorption
AT krivokapica photonenergyupconversioninporphyrinsonephotonhotbandabsorptionversustwophotonabsorption
AT andersonh photonenergyupconversioninporphyrinsonephotonhotbandabsorptionversustwophotonabsorption
AT rebanea photonenergyupconversioninporphyrinsonephotonhotbandabsorptionversustwophotonabsorption