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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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2010
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| Zitieren: | 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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Crépin, C. Shafizadeh, N. Chin, W. Galaup, J.-P. McCaffrey, J.G. Arabei, S.M. 2017-05-19T09:17:16Z 2017-05-19T09:17:16Z 2010 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 https://nasplib.isofts.kiev.ua/handle/123456789/117046 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. The assistance of Dr. Michel Broquier and Dr. Pierre Çarçabal for the design of the oven used for vaporization of the porphyrin molecules is gratefully acknowledged. The France-Belarus cooperation was supported by the CNRS/BRFFR no. 23181 agreement and grant BRFFR no. F09F-001. McC’s participation in this work was made possible with support from Science Foundation Ireland (SFI), Research Frontiers Programme (06/RFP/CHP012). en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Nanostructures and Impurity Centers in Cryogenic Environment Unveiled optical properties of tetrapyrollic pigments in cryogenic environments Article published earlier |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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| title |
Unveiled optical properties of tetrapyrollic pigments in cryogenic environments |
| spellingShingle |
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 |
| 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 |
| 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. |
| topic |
Nanostructures and Impurity Centers in Cryogenic Environment |
| topic_facet |
Nanostructures and Impurity Centers in Cryogenic Environment |
| publishDate |
2010 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| 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.
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| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.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. |
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| first_indexed |
2025-12-01T06:23:28Z |
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2025-12-01T06:23:28Z |
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