Highly Emissive Red Heterobimetallic IrIII/MI (MI = CuI and AuI) Complexes for Efficient Light-Emitting Electrochemical Cells

Anna Bonfiglio, Pei Wan Hsiao, Yin Chen, Christophe Gourlaouen, Quentin Marchand, Vincent César, Stéphane Bellemin-Laponnaz, Yun Xin Wang, Chin Wei Lu, Chantal Daniel, Federico Polo, Hai Ching Su*, Matteo Mauro

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A class of four bright heterobimetallic emitters is presented, which features both a chromophoric [Ir(C^N)2] center and a positively charged, linear bis-NHC M(I) ancillary moiety bridged through a Janus-type ligand. An in-depth investigation of their optical and electrochemical properties is also reported, which are further elucidated by means of time-dependent density functional theory including spin-orbital coupling effects. All complexes display efficient, vibrant red phosphorescence with a higher quantum yield and a faster radiative rate constant compared to the mononuclear parental complexes. This effect was elucidated in terms of better S-T excited-state mixing as well as increased rigidity favored by the multimetallic architecture. Finally, their electroluminescence performances are investigated by using these bimetallic complexes as electroactive materials in light-emitting electrochemical cells, achieving external quantum efficiency values up to 6% and resulting in among the most efficient ones for red emitters. This result is also attributable to the charge-neutral nature of an emitting Ir complex bearing a charged, wider energy gap, metal complex as an ancillary moiety.

Original languageEnglish
Pages (from-to)1756-1769
Number of pages14
JournalChemistry of Materials
Volume34
Issue number4
DOIs
StatePublished - 22 Feb 2022

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