Highly Emissive Red Heterobimetallic Ir III /M I (M I = Cu I and Au I ) Complexes for Efficient Light-Emitting Electrochemical Cells - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Chemistry of Materials Année : 2022

Highly Emissive Red Heterobimetallic Ir III /M I (M I = Cu I and Au I ) Complexes for Efficient Light-Emitting Electrochemical Cells

Résumé

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.
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hal-03789493 , version 1 (27-09-2022)

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Anna Bonfiglio, Pei-Wan Hsiao, Yin Chen, Christophe Gourlaouen, Quentin Marchand, et al.. Highly Emissive Red Heterobimetallic Ir III /M I (M I = Cu I and Au I ) Complexes for Efficient Light-Emitting Electrochemical Cells. Chemistry of Materials, 2022, 34 (4), pp.1756-1769. ⟨10.1021/acs.chemmater.1c03972⟩. ⟨hal-03789493⟩
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