Synthesis, photoluminescence and electroluminescence of triphenylphosphine functionalized cyclometalated iridium(III) complexes

Guiping Tan, Liqi Wang, Shoushan Wang, Peng Liu, Hongbo Fan, Cheuk Lam HO, Dongge Ma, Wai Yeung WONG*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Three greenish-blue iridium (III) phosphorescent complexes with the molecular structure of [Ir(pppy)2(PPh3)L] (Hpppy = 2-(4-phenoxyphenyl)pyridine; L = Cl, NCS, NCO) were synthesized and characterized. Their photoluminescence spectra are significantly blue-shifted after introducing the strong-field ancillary ligand triphenylphosphine. These compounds exhibit emission peaks in the range of 474–479 nm in solutions at 298 K with quantum yields up to 0.33. The organic light-emitting diodes (OLEDs) were fabricated by thermal evaporation with complex 3. The best OLED D3 was obtained with turn-on voltage of 4.3 V, maximum luminance of 11931 cd m−2 under 15.7 V, highest luminance efficiency (ηL) as 16.6 cd A−1, power efficiency (ηP) as 12.2 lm W−1 and external quantum efficiency (EQE) as 5.6%.

Original languageEnglish
Pages (from-to)717-725
Number of pages9
JournalDyes and Pigments
Volume160
DOIs
Publication statusPublished - Jan 2019

Scopus Subject Areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

User-Defined Keywords

  • Crystal structure
  • Iridium(III) complexes
  • Organic light-emitting diodes
  • Phosphorescence
  • Triphenylphosphine

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