Picosecond Generation of Transient Charge Carriers in Langmuir-Blodgett Films of Semi-Amphiphilic Heterodimers

Thu Hoa Tran Thi 1 Jean-François Lipskier 1 Daniel Houde 2 Claude Pépin 2 R. Langlois 2 Serge Palacin 1
1 SCM - Service de Chimie Moléculaire
2 Sherbrooke - Laboratoire de Spectroscopie Optique Ultrarapide
Abstract : Langmuir-Blodgett homolayers are formed by deposition of semi-amphiphilic porphyrin-phthalocyanine heterodimers. The optical and photophysical properties of these dimers have been investigated and compared to the liquid-phase data. Excitation of the dimer results in an instantaneous formation of the singlet excited states, followed by a very efficient charge-transfer reaction. The oxidized porphyrin and reduced phthalocyanine moieties are formed within 2 ps and disappear in 70 ps. The triplet excited states of the porphyrin issued from the intersystem crossing decay pathway of the singlet excited states are formed with a very low quantum yield. They also undergo a charge-transfer reaction, leading to the formation of long-lived transient charge carriers. The photoprocesses determined in the Langmuir-Blodgett films of semi-amphiphilic porphyrin-phthalocyanine heterodimers are almost identical to those previously observed for the same dimers in the liquid phase.
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Thu Hoa Tran Thi, Jean-François Lipskier, Daniel Houde, Claude Pépin, R. Langlois, et al.. Picosecond Generation of Transient Charge Carriers in Langmuir-Blodgett Films of Semi-Amphiphilic Heterodimers. Journal of the Chemical Society, Faraday Transactions, Royal Society of Chemistry, 1994, 88, pp.2529-2535. ⟨10.1039/FT9928802529⟩. ⟨cea-01057135⟩

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