Characterization of hemicyanine Langmuir-Blodgett films by picosecond time-resolved fluorescence
Language
en
Article de revue
This item was published in
Journal of Photochemistry and Photobiology B: Biology. 2008-10-16, vol. 93, n° 1, p. 44-52
Elsevier
English Abstract
Hemicyanine Langmuir–Blodgett films have been elaborated and characterized using stationary and time-resolved spectroscopic techniques. Depending on the experimental conditions, especially the pH of the water subphase, the ...Read more >
Hemicyanine Langmuir–Blodgett films have been elaborated and characterized using stationary and time-resolved spectroscopic techniques. Depending on the experimental conditions, especially the pH of the water subphase, the absorption spectra of the films indicate the presence of non-fluorescent Haggregates in the monolayer. Time-resolved fluorescence measurements revealed three mono-exponential decay times: a very short one (20–23 ps) attributed to an excited intramolecular charge transfer state and two longer ones (100–120 ps and 400–590 ps) attributed to thephotoisomerization of the chromophores.Read less <
English Keywords
Langmuir–Blodgett film
Hemicyanine
Fluorescence
Charge transfer
Photoisomerization
Origin
Hal imported