Singlet oxygen quantum yield determination for a fluorene-based two-photon photosensitizer

Kevin D. Belfield, Mykhailo V. Bondar, Olga V. Przhonska

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24 Scopus citations


The quantum yield, Φ Δ, of singlet oxygen generation under two-photon excitation has been determined for a fluorene derivative. A photochemical method was developed using 1,3-diphenylisobenzofuran (DPBF), a chemical quencher of 1O 2, and 2-(9,9-didecyl-7- nitrofluoren-2-yl)benzothiazole (1) as a two-photon photosensitizer (PS). The photochemical kinetics of the quencher was measured by two different fluorescence methods. Fluorene 1 exhibited relatively high singlet oxygen quantum yield, Φ Δ∈≈∈0.4∈±∈0. 1, and had a two-photon absorption cross-section of 28∈±∈5GM. Thus, 1 may have potential for use as a two-photon PS in the near-IR spectral region for biomedical applications.

Original languageEnglish (US)
Pages (from-to)111-117
Number of pages7
JournalJournal of Fluorescence
Issue number1
StatePublished - Jan 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Spectroscopy
  • Clinical Biochemistry


  • Fluorene
  • Photosensitizer
  • Singlet Oxygen
  • Two-Photon


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