Blue Emissive fac/mer-Iridium (III) NHC Carbene Complexes and their Application in OLEDs

Muazzam Idris, Savannah C. Kapper, Abegail C. Tadle, Thilini Batagoda, Daniel Sylvinson Muthiah Ravinson, Opeoluwa Abimbola, Peter I. Djurovich, Jongchan Kim, Caleb Coburn, Stephen R. Forrest, Mark E. Thompson

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

The photophysical and electrochemical properties of N-heterocyclic carbene complexes of Iridium (III) (Ir(C^C:)3, where C^C: = N-phenyl,N-methyl-pyrazinoimidazol-2-yl (pmpz), N,N-di-p-tolyl-pyrazinoimidazol-2-yl (tpz)) are reported. Facial and meridional isomers of Ir(pmpz)3 are prepared, but only the facial isomer can be isolated for Ir(tpz)3. The fac-Ir(pmpz)3 and fac-Ir(tpz)3 complexes have emission maxima at 465 nm in polystyrene, whereas the emission maximum of mer-Ir(pmpz)3 is redshifted to 495 nm. The emission energies and photoluminescent quantum yield (ΦPL) in solution decrease on going from nonpolar to polar solvents; however, all the complexes are efficient emitters in polystyrene at room temperature (ΦPL = 88–96%) and 77 K. Blue phosphorescent organic light emitting diodes employing fac-Ir(tpz)3 as an emissive dopant achieves a high external electroluminescence efficiency (≈18 ± 1%) and brightness (29 000 cd m−2) at low current density.

Original languageEnglish
Article number2001994
JournalAdvanced Optical Materials
Volume9
Issue number8
DOIs
Publication statusPublished - 2021 Apr 20

Bibliographical note

Publisher Copyright:
© 2021 Wiley-VCH GmbH

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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