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Characterization of hemicyanine Langmuir–Blodgett films by picosecond time-resolved fluorescence

Paper ID Volume ID Publish Year Pages File Format Full-Text
30175 44462 2008 9 PDF Available
Title
Characterization of hemicyanine Langmuir–Blodgett films by picosecond time-resolved fluorescence
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 absorption spectra of the films indicate the presence of non-fluorescent H-aggregates 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 the photoisomerization of the chromophores.

Keywords
Langmuir–Blodgett film; Hemicyanine; Fluorescence; Charge transfer; Photoisomerization
First Page Preview
Characterization of hemicyanine Langmuir–Blodgett films by picosecond time-resolved fluorescence
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 93, Issue 1, 16 October 2008, Pages 44–52
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering