Thickness dependence of the fluorescence lifetime in films of bisfluorene-cored dendrimers

J. C. Ribierre, A. Ruseckas, P. E. Shaw, H. S. Barcena, P. L. Burn, I. D.W. Samuel

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Abstract

The effect of film thickness on fluorescence lifetime, quantum yield, and exciton diffusivity is studied in first-generation bisfluorene-cored dendrimers with E-stilbenyl and biphenyl-based dendrons. A decrease of the fluorescence lifetime and quantum yield is observed in films thinner than 50 nm spin-coated on fused silica substrates. The radiative decay of the singlet excited-state and singlet exciton diffusion rates are independent of the film thickness within a 20% uncertainty. The fluorescence lifetime of dendrimers dispersed in an inert host is also independent of film thickness. The nonradiative decay rate increases by a factor of 4 in thin films of dendrimers with first-generation E-stilbenyl dendrons. The same effect is observed on different glass and sapphire substrates, and it is much weaker in the dendrimer with first-generation biphenyl dendrons, which allows us to rule out quenching by substrate. The data can be explained by long-range (dipole - dipole) energy transfer to quenching sites concentrated at the surface of thin films. The results contribute to understanding of the thin film photophysics and will help development of light-emitting devices.

Original languageEnglish
Pages (from-to)20463-20468
Number of pages6
JournalJournal of Physical Chemistry C
Volume112
Issue number51
DOIs
Publication statusPublished - Dec 1 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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    Ribierre, J. C., Ruseckas, A., Shaw, P. E., Barcena, H. S., Burn, P. L., & Samuel, I. D. W. (2008). Thickness dependence of the fluorescence lifetime in films of bisfluorene-cored dendrimers. Journal of Physical Chemistry C, 112(51), 20463-20468. https://doi.org/10.1021/jp805429d