Influence of magnetic field on delayed fluorescence of coumarin dye in Langmuir-Blodgett films

N. Kh Ibrayev, D. A. Afanasyev

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4 Citations (Scopus)

Abstract

The triplet-triplet annihilation (TTA) was studied in mixed Langmuir-Blodgett films of 7-decyloxy-3 (4′-ethoxyphenyl)-coumarin molecules and palmitic acid. The thermal activation of the TTA process is observed due to the inhomogeneous broadening of triplet energy levels. Modulation of the TTA rate constant in the external magnetic field for the multilayer films shows the dependence that is characteristic of crystals. Only negative magnetic effect is observed for the monolayers. Time dependence of the magnetic effect in conditions of high rate constant of triplet excitons migration is connected with the dominating contribution of ordered clusters or randomly oriented molecule clusters into the TTA process.

Original languageEnglish
Pages (from-to)39-45
Number of pages7
JournalChemical Physics Letters
Volume538
DOIs
Publication statusPublished - 11 Jun 2012
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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