Unveiled optical properties of tetrapyrollic pigments in cryogenic environments

Unveiled optical properties of tetrapyrollic pigments in cryogenic environments

An unexpected phenomenon was revealed in the laser induced fluorescence spectra of free-base (H₂Pc) and zinc (ZnPc) phthalocyanines trapped in rare gas and nitrogen matrices under a moderate increase in the laser intensity. In all matrices the intensity of an emission band near 755 nm increased dras...

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Бібліографічні деталі
Дата:2010
Автори: Crépin, C., Shafizadeh, N., Chin, W., Galaup, J.-P., McCaffrey, J.G., Arabei, S.M.
Формат: Стаття
Мова:English
Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2010
Назва видання:Физика низких температур
Теми:
Nanostructures and Impurity Centers in Cryogenic Environment
Онлайн доступ:http://dspace.nbuv.gov.ua/handle/123456789/117046
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Назва журналу:Digital Library of Periodicals of National Academy of Sciences of Ukraine
Цитувати:Unveiled optical properties of tetrapyrollic pigments in cryogenic environments / C. Crépin, N. Shafizadeh, W. Chin, J.-P. Galaup, J.G. McCaffrey, S.M. Arabei // Физика низких температур. — 2010. — Т. 36, № 5. — С. 563-570. — Бібліогр.: 21 назв. — англ.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine
id irk-123456789-117046
record_format dspace
spelling irk-123456789-1170462017-05-20T03:03:06Z Unveiled optical properties of tetrapyrollic pigments in cryogenic environments Crépin, C. Shafizadeh, N. Chin, W. Galaup, J.-P. McCaffrey, J.G. Arabei, S.M. Nanostructures and Impurity Centers in Cryogenic Environment An unexpected phenomenon was revealed in the laser induced fluorescence spectra of free-base (H₂Pc) and zinc (ZnPc) phthalocyanines trapped in rare gas and nitrogen matrices under a moderate increase in the laser intensity. In all matrices the intensity of an emission band near 755 nm increased drastically when pumping the S₁←S₀ transition. This observation was assigned to stimulated emission in a four-level scheme involving a vibronic transition from the lowest electronic state to a vibrational level of the ground state. In the present work, we expose new similar results obtained with porphyrin molecules, i.e. tetra-benzoporphin (TBP). With free-base H₂TBP, stimulated emission was observed in Ar or N₂ matrices, but not in Xe matrices. A possible reason could be a fast inter-system crossing rate due to the heavy atom effect induced by Xe. We also report the observation of persistent burnt spectral holes, although the low efficiency of this process is not competitive with stimulated emission and no decrease of the stimulated emission with time was observed. With ZnTBP, no stimulated emission could be recorded; however the appearance of rather strong phosphorescence was noticed. Similar studies focusing on the stimulated emission phenomenon is that they should allow new insights into site effects and site selectivity. 2010 Article Unveiled optical properties of tetrapyrollic pigments in cryogenic environments / C. Crépin, N. Shafizadeh, W. Chin, J.-P. Galaup, J.G. McCaffrey, S.M. Arabei // Физика низких температур. — 2010. — Т. 36, № 5. — С. 563-570. — Бібліогр.: 21 назв. — англ. 0132-6414 PACS: 33.50.–j, 33.80.–b, 78.47.–p, 78.60.Lc http://dspace.nbuv.gov.ua/handle/123456789/117046 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection DSpace DC
language English
topic Nanostructures and Impurity Centers in Cryogenic Environment
Nanostructures and Impurity Centers in Cryogenic Environment
spellingShingle Nanostructures and Impurity Centers in Cryogenic Environment
Nanostructures and Impurity Centers in Cryogenic Environment
Crépin, C.
Shafizadeh, N.
Chin, W.
Galaup, J.-P.
McCaffrey, J.G.
Arabei, S.M.
Unveiled optical properties of tetrapyrollic pigments in cryogenic environments
Физика низких температур
description An unexpected phenomenon was revealed in the laser induced fluorescence spectra of free-base (H₂Pc) and zinc (ZnPc) phthalocyanines trapped in rare gas and nitrogen matrices under a moderate increase in the laser intensity. In all matrices the intensity of an emission band near 755 nm increased drastically when pumping the S₁←S₀ transition. This observation was assigned to stimulated emission in a four-level scheme involving a vibronic transition from the lowest electronic state to a vibrational level of the ground state. In the present work, we expose new similar results obtained with porphyrin molecules, i.e. tetra-benzoporphin (TBP). With free-base H₂TBP, stimulated emission was observed in Ar or N₂ matrices, but not in Xe matrices. A possible reason could be a fast inter-system crossing rate due to the heavy atom effect induced by Xe. We also report the observation of persistent burnt spectral holes, although the low efficiency of this process is not competitive with stimulated emission and no decrease of the stimulated emission with time was observed. With ZnTBP, no stimulated emission could be recorded; however the appearance of rather strong phosphorescence was noticed. Similar studies focusing on the stimulated emission phenomenon is that they should allow new insights into site effects and site selectivity.
format Article
author Crépin, C.
Shafizadeh, N.
Chin, W.
Galaup, J.-P.
McCaffrey, J.G.
Arabei, S.M.
author_facet Crépin, C.
Shafizadeh, N.
Chin, W.
Galaup, J.-P.
McCaffrey, J.G.
Arabei, S.M.
author_sort Crépin, C.
title Unveiled optical properties of tetrapyrollic pigments in cryogenic environments
title_short Unveiled optical properties of tetrapyrollic pigments in cryogenic environments
title_full Unveiled optical properties of tetrapyrollic pigments in cryogenic environments
title_fullStr Unveiled optical properties of tetrapyrollic pigments in cryogenic environments
title_full_unstemmed Unveiled optical properties of tetrapyrollic pigments in cryogenic environments
title_sort unveiled optical properties of tetrapyrollic pigments in cryogenic environments
publisher Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
publishDate 2010
topic_facet Nanostructures and Impurity Centers in Cryogenic Environment
url http://dspace.nbuv.gov.ua/handle/123456789/117046
citation_txt Unveiled optical properties of tetrapyrollic pigments in cryogenic environments / C. Crépin, N. Shafizadeh, W. Chin, J.-P. Galaup, J.G. McCaffrey, S.M. Arabei // Физика низких температур. — 2010. — Т. 36, № 5. — С. 563-570. — Бібліогр.: 21 назв. — англ.
series Физика низких температур
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AT galaupjp unveiledopticalpropertiesoftetrapyrollicpigmentsincryogenicenvironments
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first_indexed 2023-10-18T20:28:54Z
last_indexed 2023-10-18T20:28:54Z
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