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Title: Photophysicalcharacterisation of some dipyrromethenedyes in ethylacetate and covalentlybound to poly(methyl methacrylate
Authors: Susdorf, T.; Álvarez, M.; Holzer, W.; Penzkofer, A.; Amat-Guerri, Francisco; Liras, Marta; Costela, A.; García-Moreno, Inmaculada; Sastre, Roberto
Keywords: Dipyrromethene dyes
Dipyrromethene dyes covalently bound to PMMA
Absorption spectroscopy
Fluorescence spectroscopy
Saturable absorption
Excited-state absorption
Photo-degradation
Issue Date: 2005
Publisher: Elsevier
Citation: Chemical Physics 312 : 151–158 (2005)
Abstract: Analogues of the dipyrromethene-BF2 dye PM567 modified at the 8-position by acetoxymethyl (P1Ac), s-acetoxypentyl (P5Ac), and p-acetoxymethylphenyl (PAr1Ac) groups are studied in ethyl acetate solution. PM567 modified at the 8-position by methacryloyloxymethyl (P1MA), s-methacryloyloxypentyl (P5MA), and p-methacryloyloxymethylphenyl (PAr1MA) groups have been copolymerized with methyl methacrylate (MMA), and these solid samples are also studied. The absorption cross-section and stimulated emission cross-section spectra are determined. The fluorescence quantum distributions and fluorescence lifetimes are measured. Saturable absorption measurements with picosecond laser excitation are carried out for excited-state absorption crosssection determination at the excitation wavelength. The photo-degradation of the dyes is studied under cw laser excitation conditions and quantum yields of photo-degradation are extracted.
Publisher version (URL): http://dx.doi.org/10.1016/j.chemphys.2004.11.035
URI: http://hdl.handle.net/10261/59868
ISSN: 0301-0104
DOI: 10.1016/j.chemphys.2004.11.035
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