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)

Abstract

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
Number of pages5
JournalPhysical Review. B, Condensed matter and materials physics
Volume77
DOIs
Publication statusPublished - Feb 2008

Keywords

  • LIGHT-EMITTING-DIODES
  • ORGANIC ELECTROLUMINESCENT DEVICES
  • HIGH-EFFICIENCY
  • ELECTROPHOSPHORESCENT DEVICES
  • PHOSPHORESCENCE
  • ANNIHILATION
  • TRANSPORT
  • EMISSION
  • LAYER

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