Green phosphorescent iridium dendrimers containing dendronized benzoimidazole-based ligands for OLEDs

Wei Sheng Huang, Jiann T. Lin*, Hong-Cheu Lin

*Corresponding author for this work

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

A series of novel non-conjugated functionalized benzoimidazole-based dendrimers containing peripheral benzyl ether type dendrons have been synthesized and characterized. These compounds undergo cyclometalation with iridium trichloride to form iridium(III) complexes. The emission wavelengths of these dendrimers are in the range from 510 to 530 nm, and the photoluminescence quantum yields (PLQYs) in the range from 0.45 to 0.80. Dendrimers (Gn)2Ir(acac) and (Gn)3Ir exhibit a reversible one-electron oxidation wave at ∼0.55 V and ∼0.37 V (vs. Ag/AgNO3), respectively. With a device configuration of indium tin oxide/poly(3,4-ethylenedioxythiophene):poly(styrene sulfonic acid)/4,4′-bis(N-carbarzolyl)biphenyl:(G2)3Ir 20 wt% dopant/1,3,5-tris(2-N-phenyl-benzoimidazolyl)benzene/LiF/Al has a maximum external quantum efficiency (EQE) of 17.6% and a maximum current efficiency of 61.5 cd/A.

Original languageEnglish
Pages (from-to)557-568
Number of pages12
JournalOrganic Electronics
Volume9
Issue number5
DOIs
StatePublished - 1 Jan 2008

Keywords

  • Dendrimers
  • Iridium complexes
  • Light-emitting diodes
  • Phosphorescence

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