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

Goncalves, Pablo José; Barbosa Neto,  Newton Martins; Parra, Gustavo Gimenez; De Boni, Leonardo; Ferreira, Lucimara Perpetua; Siqueira,  Jonathas de Paula; Misoguti, Lino; Borissevitch, Iouri; Zilio, Sérgio Carlos

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

Data

2012

Autores

Goncalves, Pablo José

Barbosa Neto, Newton Martins

Parra, Gustavo Gimenez

De Boni, Leonardo

Ferreira, Lucimara Perpetua

Siqueira, Jonathas de Paula

Misoguti, Lino

Borissevitch, Iouri

Zilio, Sérgio Carlos

Resumo

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 S1 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.

Palavras-chave

Excited states, Nonlinear absorption, Z-scan, Aggregation, Triplet quantum yield

Citação

GONÇALVES, P. J. et al. Excited-state dynamics of meso-tetrakis(sulfonatophenyl) porphyrin J-aggregates. Optical Materials, Amsterdam, v. 34, p. 741-747, 2012. DOI: 10.1016/j.optmat.2011.10.012. Disponível em: https://www.sciencedirect.com/science/article/pii/S0925346711005052. Acesso em: 3 jul. 2024.