Temperature dependence of the triplet diffusion and quenching rates in films of an Ir (ppy)3 -cored dendrimer

J. C. Ribierre, A. Ruseckas, I. D.W. Samuel, S. V. Staton, P. L. Burn

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26 Citations (Scopus)


We study photoluminescence and triplet-triplet exciton annihilation in a neat film of a fac-tris(2-phenylpyridyl)iridium(III) [Ir (ppy)3] -cored dendrimer and in its blend with a 4, 4′ -bis (N -carbazolyl)biphenyl host for the temperature range of 77-300 K. The nearest neighbor hopping rate of triplet excitons is found to increase by a factor of 2 with temperature between 150 and 300 K and is temperature independent at lower temperature. The intermolecular quenching rate follows the Arrhenius law with an activation energy of 7 meV, which can be explained by stronger dipole-dipole interactions with the donor molecule in the higher triplet substate. The results indicate that energy disorder has no significant effect on triplet transport and quenching in these materials.

Original languageEnglish
Article number085211
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number8
Publication statusPublished - Feb 27 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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