Photochemical properties of (7-benzothiazol-2-yl-9, 9-didecylfluoren-2-yl)diphenylamine under one- and two-photon excitation

Kevin D. Belfield, Mykhailo V. Bondar, Olga V. Przhonska, Katherine J. Schafer

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

The photochemical properties of the fluorene derivative (7-benzothiazol -2-yl-9,9-didecylfluoren-2-yl)diphenylamine (1) in hexane and CH2Cl2 were studied under linear (one-photon) and nonlinear (two-photon) excitation. The quantum yield of the photochemical reaction, Φ, for 1 in hexane was in the range (3.5-5)×10-5 for one-photon excitation (UVGL-25 and Xe-lamps) and was nearly the same under two-photon excitation (femtosecond laser with pulse duration 120 fs, average power ∼10 mW, repetition rate f=1 kHz). The values of Φ in CH2Cl2 were (2.5-4)×10-5 for one-photon excitation and increased 50-80 times under two-photon excitation. This increase can be explained by an additional one-photon absorption process from the first electronically excited state, resulting in the observed enhancement in photochemical decomposition.

Original languageEnglish (US)
Pages (from-to)569-574
Number of pages6
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume162
Issue number2-3
DOIs
StatePublished - Mar 15 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

Keywords

  • Fluorene derivatives
  • Photochemical quantum yield
  • Photodecomposition
  • Photostability
  • Two-photon excitation

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