Photophysical and electrochemical properties of blue phosphorescent iridium(III) complexes

Li Lan Wu, Cheng Hsien Yang, I-Wen Sun, Sheng-Yuan Chu, Po Ching Kao, Hsin Hsuan Huang

Research output: Contribution to journalArticlepeer-review

94 Citations (Scopus)

Abstract

A series of 2-difluorophenyl-4-methoxypyridine ligands were synthesized and successfully used to prepare indium complexes including bis[2-(2′, 3′-difluorophenyl)-4-methoxypyridinato-N,C2′]iridium(III) [5-(2′-pyridyl)tetrazolate] (5a1), bis[2-(2′,4′- difluorophenyl)-4-methoxypyridinato-N,C2′]iridium(III) [5-(2′-pyridyl)tetrazolate] (5a2), bis[2-(2′,5′- difluorophenyl)-4-methoxypyridinato-N,C2′]iridium(III) [5-(2′-pyridyl)tetrazolate] (5a3), bis[2-(3′,4′- difluorophenyl)-4-methoxypyridinato-N,C2′]iridium(III) [5-(2′-pyridyl)tetrazolate] (5a4), and bis[2-(3′,5′- difluorophenyl)-4-methoxypyridinato-NC2′]iridium(III) [5-(2′-pyridyl)tetrazolate] (5a5). Interestingly, 5a4 exhibits 2′-coordinated and 6′-coordinated isomers. The coordination behavior of this ligand with iridium metal differed depending on the repulsion energy and the delocalization energy effects of the iridium complexes. X-ray structural analysis technique was successfully applied to interpret the different coordination behavior of 5a4. In addition, introducing the methoxy group to the well-known ligand (2-difluorophenylpyridine) successfully expanded the band gap of iridium complexes and made 5a2 exhibit the bluest emission at 452 nm. To the best of our knowledge, this is one of the bluest OLEDs based on a 2-difluorophenylpyridine-iridium coordination emitter.

Original languageEnglish
Pages (from-to)2017-2023
Number of pages7
JournalOrganometallics
Volume26
Issue number8
DOIs
Publication statusPublished - 2007 Apr 9

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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