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    Photochemical properties of porphyrin films covering curved surfaces of optical fibers

    Year: 2009

    Journal: Chemical Physics Letters, Volume 471, Issues 4-6, 26 March 2009, Pages 290-294, 20111221

    Authors: Alexey Veselov, Christoph Thür, Vladimir Chukharev, Mircea Guina, Helge Lemmetyinen and Nikolai V. Tkachenko

    Organizations: Department of Chemistry and Bioengineering, Tampere University of Technology, P.O. Box 541, 33101 Tampere, Finland, Optoelectronics Research Centre, Tampere University of Technology, P.O. Box 692, 33101 Tampere, Finland

    Surface organization and photochemistry of Langmuir–Blodgett (LB) monolayers of 10 mol-% 5,10,15,20-tetrakis(pentafluorophenyl)porphyrin (PFP) in an octadecylamine (ODA) matrix on flat quartz and tapered optical fiber surfaces are studied. Previous investigations of PFP films on flat surfaces had revealed that they exhibit a relatively long fluorescence lifetime (not, vert, similar4 ns). In this Letter we show that the fluorescence lifetime of PFP films deposited on optical fiber-tapers with diameters between 10 and 20 μm is ten times shorter than that measured for the flat surface, being about 0.3 ns. Besides, films on tapered fibers are found to aggregate into domains with typical sizes smaller than those on flat surfaces.