New trifluoromethyl modified iridium(III) complex for high-efficiency sky-blue phosphorescent organic light-emitting diode

Xiao Kang Zheng, Fang Qing Zhao, Meng Na Yin, Cheng Qian, Shuai Hang Bi, Peng Tao, Yan Qin Miao, Shu Juan Liu, Qiang Zhao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

A new and efficient trifluoromethyl modified sky-blue iridium(III) coordination compound (Ir-CF3) is well designed and prepared by using bis(trifluoromethyl) modified 4-methyl-2-phenylpyridine as the cyclometalating ligand and 2-(1H-imidazol-2-yl)pyridine as the auxiliary ligand. Ir-CF3 shows intensive sky-blue phosphorescence (465 nm with 494 nm as shoulder), high solution photoluminescence efficiency (0.22). The incorporation of trifluoromethyl moiety into the complex not only enhances the robust chemical stability but also provides the steric hindrance beneficial to organic light-emitting diodes. The sky-blue OLEDs based on this complex show narrow emission band with full width at half maxima of 54 nm. The peak power efficiency, current efficiency and external quantum efficiency of electroluminescence are as high as 36.05 lm/W, 51.45 cd/A and 21.74%, respectively.

Original languageEnglish
Article number153181
JournalTetrahedron Letters
Volume75
DOIs
Publication statusPublished - 6 Jul 2021

Keywords

  • Aromatic fluorine-free
  • Blue phosphorescence
  • Iridium(III) complex
  • Organic light-emitting diodes

ASJC Scopus subject areas

  • Biochemistry
  • Drug Discovery
  • Organic Chemistry

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