Phosphorescent Iridium(III) Complexes Bearing Fluorinated Aromatic Sulfonyl Group with Nearly Unity Phosphorescent Quantum Yields and Outstanding Electroluminescent Properties

Jiang Zhao, Yue Yu, Xiaolong Yang, Xiaogang Yan, Huiming Zhang, Xianbin Xu, Guijiang Zhou*, Zhaoxin Wu, Yixia Ren, Wai Yeung WONG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

A series of heteroleptic functional IrIII complexes bearing different fluorinated aromatic sulfonyl groups has been synthesized. Their photophysical features, electrochemical behaviors, and electroluminescent (EL) properties have been characterized in detail. These complexes emit intense yellow phosphorescence with exceptionally high quantum yields (φP > 0.9) at room temperature, and the emission maxima of these complexes can be finely tuned depending upon the number of the fluorine substituents on the pendant phenyl ring of the sulfonyl group. Furthermore, the electrochemical properties and electron injection/transporting (EI/ET) abilities of these IrIII phosphors can also be effectively tuned by the fluorinated aromatic sulfonyl group to furnish some desired characters for enhancing the EL performance. Hence, the maximum luminance efficiency (ηL) of 81.2 cd A-1, corresponding to power efficiency (ηP) of 64.5 lm W-1 and external quantum efficiency (ηext) of 19.3%, has been achieved, indicating the great potential of these novel phosphors in the field of organic light-emitting diodes (OLEDs). Furthermore, a clear picture has been drawn for the relationship between their optoelectronic properties and chemical structures. These results should provide important information for developing highly efficient phosphors.

Original languageEnglish
Pages (from-to)24703-24714
Number of pages12
JournalACS applied materials & interfaces
Volume7
Issue number44
DOIs
Publication statusPublished - 11 Nov 2015

Scopus Subject Areas

  • Materials Science(all)

User-Defined Keywords

  • electron injection/transporting
  • fluorination
  • functionalization
  • iridium complexes
  • OLEDs
  • sulfonyl group

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