Charge transport in highly efficient iridium cored electrophosphorescent dendrimers

JPJ Markham, Ifor David William Samuel, SC Lo, PL Burn, M Weiter, H Bassler

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)

Abstract

Electrophosphorescent dendrimers are promising materials for highly efficient light-emitting diodes. They consist of a phosphorescent core onto which dendritic groups are attached. Here, we present an investigation into the optical and electronic properties of highly efficient phosphorescent dendrimers. The effect of dendrimer structure on charge transport and optical properties is studied using temperature-dependent charge-generation-layer time-of-flight measurements and current voltage (I-V) analysis. A model is used to explain trends seen in the I-V characteristics. We demonstrate that fine tuning the mobility by chemical structure is possible in these dendrimers and show that this can lead to highly efficient bilayer dendrimer light-emitting diodes with neat emissive layers. Power efficiencies of 20 lm/W were measured for devices containing a second-generation (G2) Ir(ppy)(3) dendrimer with a 1,3,5-tris(2-N-phenylbenzimidazolyl)benzene electron transport layer. (C) 2004 American Institute of Physics.

Original languageEnglish
Pages (from-to)438-445
Number of pages8
JournalJournal of Applied Physics
Volume95
Issue number2
DOIs
Publication statusPublished - 15 Jan 2004

Keywords

  • LIGHT-EMITTING-DIODES
  • CONJUGATED POLYMERS
  • HOLE TRANSPORT
  • POLY(P-PHENYLENE VINYLENE)
  • ELECTROLUMINESCENT DIODES
  • CARRIER MOBILITY
  • DEVICE MODEL
  • GENERATION
  • LAYER
  • DEPENDENCE

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