Triplet exciton diffusion and phosphorescence quenching in iridium(III)-centered dendrimers

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

    Research output: Contribution to journalArticlepeer-review

    56 Citations (Scopus)

    Abstract

    A study of triplet-triplet exciton annihilation and nonradiative decay in films of iridium(III)-centered phosphorescent dendrimers is reported. The average separation of the chromophore was tuned by the molecular structure and also by blending with a host material. It was found that triplet exciton hopping is controlled by electron exchange interactions and can be over 600 times faster than phosphorescence quenching. Nonradiative decay occurs by weak dipole-dipole interactions and is independent of exciton diffusion, except in very thin films (<20nm) where surface quenching dominates the decay.

    Original languageEnglish
    Article number017402
    JournalPhysical review letters
    Volume100
    Issue number1
    DOIs
    Publication statusPublished - Jan 10 2008

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy(all)

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