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

Jean Charles Maurice Ribierre, A. Ruseckas, I. D.W. Samuel, S. V. Staton, P. L. Burn

Research output: Contribution to journalArticle

23 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
Article number085211
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number8
DOIs
Publication statusPublished - Feb 27 2008

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Dendrimers
dendrimers
Quenching
quenching
temperature dependence
excitons
Excitons
dipoles
iridium
Iridium
Temperature
temperature
disorders
activation energy
photoluminescence
Photoluminescence
Activation energy
Molecules
molecules
interactions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Temperature dependence of the triplet diffusion and quenching rates in films of an Ir (ppy)3 -cored dendrimer. / Ribierre, Jean Charles Maurice; Ruseckas, A.; Samuel, I. D.W.; Staton, S. V.; Burn, P. L.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 77, No. 8, 085211, 27.02.2008.

Research output: Contribution to journalArticle

Ribierre, Jean Charles Maurice ; Ruseckas, A. ; Samuel, I. D.W. ; Staton, S. V. ; Burn, P. L. / Temperature dependence of the triplet diffusion and quenching rates in films of an Ir (ppy)3 -cored dendrimer. In: Physical Review B - Condensed Matter and Materials Physics. 2008 ; Vol. 77, No. 8.
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