Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 113, Issue 20, Pages 7101-7106Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp902060m
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Funding
- Civilian Research and Development Foundation [UKB2-2923-KV-07]
- Ministry of Education and Science of Ukraine [M/49-2008]
- National Science Foundation [ECS-0524533, ECS-0621715, CHE-0832622]
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One- and two-photon stimulated en-fission 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 S-1 -> S-0 were shown for 1 at lambda(q) = 1064 nm, representing the first report of two-photon stimulated emission depletion (STED) in a molecular system. The two-photon stimulated emission cross section, delta(2PE)(lambda(q)), of fluorene 1 was estimated to be similar to 240-280 GM, suggesting that this compound may be a good candidate for use in two-photon STED microscopy.
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