Journal
CHEMISTRY OF MATERIALS
Volume 34, Issue 4, Pages 1756-1769Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.1c03972
Keywords
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Funding
- CNRS
- International Centre for Frontier Research in Chemistry (icFRC)
- Labex CSC [ANR-10-LABX-0026 CSC, ANR-10-IDEX-0002-02]
- French Agence Nationale de la Recherche (ANR) [ANR-18-CE06-007-01]
- Universite de Strasbourg
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This study presents a class of bright heterobimetallic emitters with enhanced fluorescence efficiency and radiative rate constant. The application of these bimetallic complexes in light-emitting electrochemical cells achieves high external quantum efficiency.
A class of four bright heterobimetallic emitters is presented, which features both a chromophoric [Ir(C boolean AND 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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