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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    25 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

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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