Title
Excited State Absorption Study In Hematoporphyrin Ix
Keywords
Excited state absorption; Multiphoton absorption; Photodynamic therapy; Porphyrin
Abstract
We present the study of the excited state absorption of Hematoporphyrin IX dissolved in dimethyl sulfoxide. All measurements were carried out using open aperture Z-scan and white-light continuum pump-probe with picosecond pulses to avoid triplet excited state absorption. Without the latter contribution, the results obtained with both techniques show a transition to a high singlet excited state. The vibronic progression of the Q-band is observed due to photobleaching of the ground state. In addition, we show that the excited state presents reverse saturable absorption for most of the spectral range studied. A long relaxation component of the first singlet excited state was evidenced with the pump-probe experiment. This result is in agreement with fluorescence lifetime and fluorescence quantum yield measurements. In order to elucidate the origin of the nonlinear effects, we used a three-level energy diagram to describe the principal singlet-singlet transitions. © 2009 Springer Science+Business Media, LLC.
Publication Date
1-1-2010
Publication Title
Journal of Fluorescence
Volume
20
Issue
1
Number of Pages
197-202
Document Type
Article
Personal Identifier
scopus
DOI Link
https://doi.org/10.1007/s10895-009-0538-z
Copyright Status
Unknown
Socpus ID
77950985302 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/77950985302
STARS Citation
De Boni, Leonardo; Toro, Carlos; and Hernandez, Florencio E., "Excited State Absorption Study In Hematoporphyrin Ix" (2010). Scopus Export 2010-2014. 1826.
https://stars.library.ucf.edu/scopus2010/1826