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FK306, namely Bis[4-tert -butyl-2',6'-difluoro-2,3'-bipyridine](acetylacetonate)iridium(III) is a bis-heteroleptic iridium complex with bulky fluorinated bipyridyl ligands.
FK306 is a highly efficient blue phosphorescent emitter with a wide bandgap (2.7 eV) and a deep HOMO energy level (6.3 eV). The deep HOMO energy level of FK306 is beneficial for electron trapping and hole blocking to balance the distribution of holes and electrons in the active layer. FK306 also has a low LUMO energy level (3.6 eV) which makes it a popular candidate as a co-dopant material for device with higher device performances.
High-performance pure blue phosphorescent OLED using a novel bis-heteroleptic iridium(III) complex with fluorinated bipyridyl ligands, F. Kessler et al., J Mater. Chem., 1 (6), 1070-1075 (2013); DOI:10.1039/C2TC00836J.
High Performances Thermally Activated Delayed Fluorescence Organic Light-emitting Diodes with Wide Gap Phosphorescent Complex as Sensitizer, Y. Cui et al., J. Mater. Chem. C, 8, 5984-5990 (2020); DOI: 10.1039/D0TC00446D.
Utilization of double-sensitized structure toward achieving high performance green and red phosphorescent organic light-emitting diodes, S. Li et al., J. Mater. Chem. C, 9, 11729-11737 (2021); DOI: 10.1039/D1TC02756E.
Novel scattering and color converting substrates for simple-structured white organic light-emitting diodes, L. Chen et al., 89 106045 (2021); DOI: 10.1016/j.orgel.2020.106045.
Phosphorescent dye doped electron transport layer for yellow thermally activated delayed fluorescent electroluminescence device, Q. Zhu et al., Optik 241, 166857 (2021); DOI: 10.1016/j.ijleo.2021.166857.
Efficient green electroluminescent devices based on iridium complex with wide energy gap complexes as sensitizers, X. Zhao et al., Org. Electron., 37, 85-92 (2016); DOI: 10.1016/j.orgel.2016.06.025.
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