Excited-state dynamics of meso-tetrakis(sulfonatophenyl) porphyrin J-aggregates

► Excited-state dynamics of porphyrin J-aggregates. ► Cross-sections, S 1 state lifetime, rates and quantum yields. ► Discrimination between internal conversion and intersystem crossing nonradiative processes. The excited-state dynamics of free-base meso-tetrakis(sulfonatophenyl) porphyrin J-aggrega...

Full description

Saved in:
Bibliographic Details
Published in:Optical materials 2012-02, Vol.34 (4), p.741-747
Main Authors: Gonçalves, P.J., Barbosa Neto, N.M., Parra, G.G., de Boni, L., Aggarwal, L.P.F., Siqueira, J.P., Misoguti, L., Borissevitch, I.E., Zílio, S.C.
Format: Article
Language:English
Subjects:
Aggregates
Aggregation
Constraining
Dynamics
Excitation
Excitation spectra
Excited states
Flash photolysis
Nonlinear absorption
Photodynamic therapy
Porphyrins
Triplet quantum yield
Z-scan
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:► Excited-state dynamics of porphyrin J-aggregates. ► Cross-sections, S 1 state lifetime, rates and quantum yields. ► Discrimination between internal conversion and intersystem crossing nonradiative processes. 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.
ISSN:0925-3467
1873-1252
DOI:10.1016/j.optmat.2011.10.012