Fluorescence lifetime of 5-(4-carboxyphenyl)-10,15,20-tritolylporphyrin in a mixed langmuir-blodgett film with dioleoylphosphatidylcholine. a proposed standard

Harold A. Dick, James R. Bolton, Gilles Picard, Gaétan Munger, Roger M. Leblanc

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Time-resolved fluorescence lifetime measurements of 5-(4-carboxyphenyl)-10,15,20-tritolylporphyrin (TTPa) with dioleoylphosphatidylcholine (DOPC) in mixed Langmuir-Blodgett (LB) films on quartz slides were performed at two different laboratories. TTPa in the mixed LB film exhibited a simpler and longer decay profile than did a pure TTPa monolayer. At a DOPC/TTPa molar ratio of 50:1, ; the decay consisted primarily of one lifetime of 10. 7 plus or minus 0. 2 ns. This mixed LB film is being offered as a standard for time-resolved fluorescence lifetime measurements of LB films. Simplification and lengthening of the lifetime were attributed to reduction of TTPa aggregate formation in the film. This effect is also seen in fluorescence and absorption spectra. The fluorescence lifetime of the standard system at the air-water interface was also measured and found to be essentially the same as that of the LB film.

Original languageEnglish (US)
Pages (from-to)133-136
Number of pages4
JournalLangmuir
Volume4
Issue number1
DOIs
StatePublished - Jan 1 1988
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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