Singlet energy transfer and singlet-singlet annihilation in light-emitting blends of organic semiconductors

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

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    Excitation energy transfer from host to guest is studied in spin-cast blends of 4, 4′ -bis(N -carbazolyl)biphenyl (CBP) and a phosphorescent fac -tris(2-phenylpyridyl)iridium(III)-cored dendrimer using time resolved fluorescence. The kinetics of energy transfer are consistent with homogeneous dispersion of the dendrimers in the CBP host. Diffusion-controlled singlet-singlet exciton annihilation is observed in the CBP host at moderate excitation densities, similar to those encountered in high brightness light-emitting devices and organic lasers. The results are important for organic lighting and the understanding of exciton diffusion in guest-host systems for electrophosphorescence.

    Original languageEnglish
    Article number183305
    JournalApplied Physics Letters
    Volume95
    Issue number18
    DOIs
    Publication statusPublished - 2009

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy (miscellaneous)

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