Excited-state dynamics of meso-tetrakis(sulfonatophenyl) porphyrin J-aggregates
- Goncalves, P. J.
- Barbosa Neto, N. M.
- Parra, G. G.
- De Boni, Leonardo
- Aggarwal, L. P. F.
- Siqueira, J. P.
- Misoguti, Lino
- Borissevitch, I. E.
- Zilio, S. C.
DOIAbstract
The excited-state dynamics of free-base meso-tetrakis(sulfonatophenyl) porphyrin J-aggregates obtained by the Z-scan technique in femto- and picosecond time scales, along with UV-Vis spectroscopy and flash photolysis is reported. Besides obtaining the S-1 state lifetime, the discrimination between internal conversion and intersystem crossing nonradiative processes from that state was also possible, and their rates and respective quantum yields were found. The aggregates present reverse saturable absorption at 532 nm for both singlet and triplet excited states. The data shown is important for several applications such as optical limiting, photodynamic therapy and others. (C) 2011 Elsevier B.V. All rights reserved.Fundacao de Amparo a Pesquis...
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