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Product Code M2308A1
Price $264.00 ex. VAT

FK306, co-dopant material for devices with high performances

Highly efficient blue phosphorescent emitter

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 to achieve higher device performances.

General Information

CAS number 1421058-47-0
Chemical formula C33H33F4IrN4O2
Molecular weight 785.85 g/mol
Absorption λmax 244 nm (dichloromethane)
Photoluminescence λem 454 nm (dichloromethane)
HOMO/LUMO HOMO = 6.3 eV, LUMO = 3.6 eV; ET = 2.83 eV[1]
Chemical name Bis[4-tert -butyl-2',6'-difluoro-2,3'-bipyridine](acetylacetonate)iridium(III)
Synonyms Iridium(Ⅲ)bis(4-(tert-butyl)-2,6-diuoro-2,3-bipyridinne)acetylacetonate
Classification / Family Iridium complex, Blue phosphorescent materials, Blue dopant materials, Electron transport materials, Sublimed materials, Semiconducting small molecules

Product Details

Purity Sublimed >99.0% (HPLC)
Melting point > 280 °C (0.5% weight loss)
Appearance Yellow powder/crystals

*Sublimation is a technique used to obtain ultra pure-grade chemicals. For more details about sublimation, please refer to the sublimed materials for OLED devices page.

Chemical Structure

fk306 - chemical structure - 1421058-47-0
Chemical structure of bis[4-tert -butyl-2',6'-difluoro-2,3'-bipyridine](acetylacetonate)iridium(III) (FK306), CAS 1421058-47-0.

Device Structure(s)

Device structure ITO (130 nm)/TAPC (40 nm)/FK306:mCP 15 wt% doped mCP (10 nm)/B3PyPB (50 nm)/LiF (0.5 nm)/Al (100 nm)[1]
Colour blue light emitting device Blue
EQE @100 cd/m2 15.3%
Current Efficiency @100 cd/m2 26.1 cd/A
Power Efficiency @100 cd/m2 24.2 Im/W
Device structure ITO/HAT-CN (6 nm)/HAT-CN (0.2 wt%):TAPC (50 nm)/FK306 (0.2 wt%):TXO-TPA (1.0 wt%):26DCzPPy (10 nm)/Tm3PyP26PyB (60 nm)/LiF (1 nm)/Al (100 nm) [2]
Colour orange-yellow light emitting device Orange-Yellow
Max. EQE 11.8%
Max. Current Efficiency 41.51 cd/A
Max. Power Efficiency 44.95 Im/W
Device structure ITO/HAT-CN (6 nm)/HAT-CN (0.2 wt%):TAPC (50 nm)/TXO-TPA (1.0 wt%):TcTa (5 nm)/FK306 (0.4 wt%):TXO-TPA (1.0 wt%):26DCzPPy (10 nm)/Tm3PyP26PyB (60 nm)/LiF (1 nm)/Al (100 nm) [2]
Colour orange-yellow light emitting device Orange-Yellow
Max. EQE 16.5%
Max. Current Efficiency 58.94 cd/A
Max. Power Efficiency 61.69 Im/W


Grade Order Code Quantity Price
Sublimed (>99.0% purity) M2308A1 100 mg £240
Sublimed (>99.0% purity) M2308A1 250 mg £480
Sublimed (>99.0% purity) M2308A1 500 mg £850
Sublimed (>99.0% purity) M2308A1 1 g £1450

MSDS Documentation

FK306 MSDSFK306 MSDS sheet

Literature and Reviews

  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.

To the best of our knowledge the information provided here is accurate. However, Ossila assume no liability for the accuracy of this page. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, pharmaceuticals, cosmetics, food or commercial applications.

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