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RESEARCH PRODUCT
Molecular Engineering of Iridium Blue Emitters Using Aryl N‐Heterocyclic Carbene Ligands
Henk J. BolinkMohammad Khaja NazeeruddinAron J. HuckabaSadig AghazadaAzin BabaeiIwan ZimmermannGiulia GranciniAntonio Pertegássubject
LigandArylchemistry.chemical_element02 engineering and technologyNuclear magnetic resonance spectroscopy010402 general chemistry021001 nanoscience & nanotechnologyPhotochemistry01 natural sciences0104 chemical sciencesInorganic Chemistrychemistry.chemical_compoundchemistryPyridineOLEDIridiumCyclic voltammetry0210 nano-technologyCarbenedescription
The synthesis of a new series of neutral bis[2-(2,4-difluorophen-2-yl)pyridine][1-(2-aryl)-3-methylimidazol-2-ylidene]iridium(III) complexes is reported. Each complex has been characterized by NMR spectroscopy, UV/Vis spectrophotometry, and cyclic voltammetry, and the photophysical properties examined in depth. Furthermore, two of the complexes have been characterized by single-crystal X-ray diffraction analysis. By systematically modifying the cyclometalating aryl group on the N-heterocyclic carbene (NHC) ligand from 2,4-dimethoxyphenyl to 6-methoxy-2-methyl-3-pyridyl, the energy levels of the Ir complexes were modified to produce new blue emitters with increased HOMO and triplet-state energies. OLED devices fabricated with these emitters showed external quantum efficiencies (EQEs) in the range of 2.3-3.2% with low turn-on values of 2.7-2.9 V and efficacies of up to 6.3%.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-10-11 | European Journal of Inorganic Chemistry |