Exciplex-exciplex energy transfer and annihilation in solid films of porphyrin-fullerene dyads

Heli Lehtivuori, Helge Lemmetyinen, Nikolai V. Tkachenko*

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Exciplex-exciplex annihilation was observed for the first time in porphyrin-fullerene molecular films. The films were prepared using Langmuir-Blodgett and drop casting methods. The exciplex-exciplex interactions were studied using femtosecond pump-probe method. The exciplex-exciplex annihilation can be seen as a fast (within few picoseconds) decay of the transient absorption at excitation densities higher than 0.4 mJ/cm2. Analysis of the excitation density dependences indicates that in average four dyads are involved in the exciplex-exciplex interaction, suggesting that an exciplex-exciplex energy transfer may precede the annihilation.

Original languageEnglish
Pages (from-to)16036-16037
Number of pages2
JournalJournal of the American Chemical Society
Volume128
Issue number50
DOIs
Publication statusPublished - 20 Dec 2006

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