High stability light-emitting electrochemical cells from cationic iridium complexes with bulky 5,5 ' substituents

Liangfeng Sun, Armand Galan, Sebastien Ladouceur, Jason D. Slinker*, Eli Zysman-Colman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

We explore the photophysical, electrochemical, and electroluminescent properties of the ionic transition metal complex [(ppy)(2)Ir(bpy*)](PF(6)) where ppyH is 2-phenylpyridine and bpy* is 5,5'-diaryl-2,2'-bipyridine. Single layer devices of the structure ITO/[(ppy)(2)Ir(bpy*)](PF(6))/Au exhibited high stability, with half-lives on the order of 100 h at a bias of -4 V. Long lifetimes are achieved through the bulky nature of the aryl substituents, which serves to limit chromophore-chromophore self-quenching, and 5,5' positioning of these bulky groups is clearly advantageous for device performance.

Original languageEnglish
Pages (from-to)18083-18088
Number of pages6
JournalJournal of Materials Chemistry
Volume21
Issue number44
DOIs
Publication statusPublished - 2011

Keywords

  • TRANSITION-METAL-COMPLEXES
  • ELECTROLUMINESCENT DEVICES
  • PHOTOPHYSICAL PROPERTIES
  • QUANTUM YIELDS
  • SINGLE-LAYER
  • EFFICIENT
  • GREEN
  • HEXAFLUOROPHOSPHATE
  • REDUCTION
  • REDOX

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