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Closed Access item 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.
Garcia-Moreno, I.
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
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
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