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Product Code M2308A1-100mg
Price £260 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.

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 £260
Sublimed (>99.0% purity) M2308A1 250 mg £520
Sublimed (>99.0% purity) M2308A1 500 mg £950
Sublimed (>99.0% purity) M2308A1 1 g £1600

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.
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