Triplet exciton diffusion in fac-tris(2-phenylpyridine) iridium(III)-cored electroluminescent dendrimers

E B Namdas, A Ruseckas, I D W Samuel, S C Lo, P L Burn

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116 Citations (Scopus)

Abstract

We have studied triplet-triplet annihilation in neat films of electrophosphorescent fac-tris(2-phenylpyridine) iridium(III) [Ir(ppy)(3)]-cored dendrimers containing phenylene- and carbazole-based dendrons with 2-ethylhexyloxy surface groups using time-resolved photoluminescence. From measured annihilation rates, the limiting current densities above which annihilation would dominate in dendrimer light-emitting devices are found to be > 1 A/cm(2). The triplet exciton diffusion length varies in the range of 2-10 nm depending on the dendron size. The distance dependence of the nearest-neighbor hopping rate shows that energy transfer is dominated by the exchange mechanism. (C) 2005 American Institute of Physics.

Original languageEnglish
Article number091104
Number of pages3
JournalApplied Physics Letters
Volume86
DOIs
Publication statusPublished - 28 Feb 2005

Keywords

  • LIGHT-EMITTING-DIODES
  • ELECTROPHOSPHORESCENCE
  • ANNIHILATION
  • FILMS

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