Photogeneration of transient charge carriers in an alternate porphyrin-phthalocyanine Langmuir-Blodgett film - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles Chemical Physics Letters Year : 1989

Photogeneration of transient charge carriers in an alternate porphyrin-phthalocyanine Langmuir-Blodgett film

Abstract

Long-lived triplet excitons are generated by laser excitation of a zinc porphyrin Langmuir-Blodgett film. The transient T-T spectrum is similar to that obtained in the liquid phase and the triplet excitons disappear with second-order kinetics by T-T annihilation. Their half-life varies from 110±10 to 55±5 μs with increasing laser energies. In contrast, excitation of an alternate porphyrin-phthalocyanine heterolayer leads to a charge-transfer reaction. The transient optical absorption spectrum is attributed to the oxidized porphyrin and reduced phthalocyanine on the basis of the spectrum shape and the peculiar redox properties of phthalocyanine. They are the primary transient charge carriers responsible for conduction. Their half-life varies from 700 to 300 ns with increasing laser energies.

Dates and versions

cea-01057193 , version 1 (21-08-2014)

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Cite

Thu Hoa Tran Thi, Serge Palacin, Bertrand Clergeot. Photogeneration of transient charge carriers in an alternate porphyrin-phthalocyanine Langmuir-Blodgett film. Chemical Physics Letters, 1989, 157, pp.92-96. ⟨10.1016/0009-2614(89)87214-8⟩. ⟨cea-01057193⟩
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