Department of Physics, The Hashemite University, Zarqa 13115, Jordan
Abstract. The photophysical properties of pyropheophorbide a methyl ester (PPME) were studied in homogeneous organic solvent (dimethylformamide) by means of molecular VIS absorption and fluorescence steady-state and time-resolved spectroscopy. Theoretical calculation on the parameters of homo-Förster resonance energy transfer (FRET) was performed assuming its occurrence between pyropheophorbide a methyl ester molecules in dimethylformamide solutions. Using the experimental data, the Förster radius for PPME molecules was calculated to be R0 = 53 Å. The fluorescence quantum yield and lifetime of PPME were found to be 0.21 and 7.3 ns, respectively. The linear differential equations which describe the processes in the Jablonski diagram of PPME were constructed to reveal the kinetics of the transitions.
Key words: Förster resonance energy transfer, donor, acceptor, fluorescence quantum yield, pyropheophorbide a methyl ester, Jablonski diagram
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