One - and two-photon stimulated emission depletion of a sulfonyl-containing fluorene derivative

Kevin D. Belfield, Mykhailo V. Bondar, Ciceron O. Yanez, Florencio E. Hernandez, Olga V. Przhonska

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20 Scopus citations


One- and two-photon stimulated emission transitions were investigated by the fluorescence quenching of a sulfonyl-containing fluorene compound, 2,7-bis(4-(phenylsulfonyl)styryl)-9,9-didecyl-9H-fluorene (1), in solution at room temperature using a picosecond pump-probe technique. The nature of stimulated transitions under various fluorescence excitation and quenching conditions was analyzed theoretically, and good agreement with experimental data was demonstrated. Two-photon stimulated transitions S1 → S 0 were shown for 1 at λq ) 1064 nm, representing the first report of two-photon stimulated emission depletion (STED) in a molecular system. The two-photon stimulated emission cross section, δ2PEq), of fluorene 1 was estimated to be ∼240-280 GM, suggesting that this compound may be a good candidate for use in two-photon STED microscopy.

Original languageEnglish (US)
Pages (from-to)7101-7106
Number of pages6
JournalJournal of Physical Chemistry B
Issue number20
StatePublished - May 21 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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