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Product Code M2217A1-250mg
Price $546 ex. VAT

4CzBN, sky-blue TADF fluorescence emitter

High-purity (>99.0%) and available online for priority dispatch, 2,3,5,6-tetrakis(carbazol-9-yl)benzonitrile, 1996609-93-8, 4CzBN, 4Cz-BN


4CzBN is a well-known benzonitrile based sky-blue TADF fluorescence emitter with four bulky carbazolyl groups evenly distributed on the benzene ring next to a nitrile group. The absence of any bulky group at the 4-position for 4CzBN, still produces the twisting of the carbazolyl groups at 3- and 5-positions.

Comparing with non-polar 4CzTPN which is symmetric in structure, 4CzBN has one less nitrile group leading to a lower charge carrier balance.

General Information


CAS number 1996609-93-8
Full name 2,3,5,6-tetrakis(carbazol-9-yl)benzonitrile
Chemical formula C55H33N5
Molecular weight 763.9 g/mol
Absorption* λmax 334 nm, 403 nm in toluene
Fluorescence λem 443 nm in toluene
HOMO/LUMO HOMO = 5.79 eV, LUMO = 2.75 eV, T1 = 2.66 eV [1]
Classification / Family Carbazole, Phthalonitrile, TADF materials, Blue dopant materials, Sublimed materials

* Measurable with an optical spectrometer

Product Details


Purity Sublimed >99.0% (1H NMR)
Melting point Td = 455 °C (0.5% weight loss), Tg = 316 °C (lit.)
Appearance Lime-yellow powder/crystals

* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials.

Chemical Structure


4CzBN
Chemical Structure of 2,3,5,6-tetrakis(carbazol-9-yl)benzonitrile (4CzBN).

Device Structure(s)


Device structure ITO (100 nm)/HATCN (10 nm)/Tris-PCz (30 nm) mCBP (5 nm)/15 wt.% 4CzBN:mCBP (30 nm)/T2T (10nm)/BPy-TP2 (40 nm)/ LiF (0.8 nm)/ Al (100 nm) [1]
Colour Sky-blue blue light emitting device
Max. Current Efficiency 26.6 cd/A
Max. EQE 9.7%
Max. Power Efficiency 20.9 Im/W

*For chemical structure information, please refer to the cited references.

MSDS Documentation


4CzBN MSDS4CzBN MSDS sheet

Pricing


Grade Order Code Quantity Price
Sublimed (>99.0% purity) M2217A1 250 mg £420
Sublimed (>99.0% purity) M2217A1 500 mg £700
Sublimed (>99.0% purity) M2217A1 1 g £1150

Literature and Reviews


  1. Efficient and stable sky-blue delayed fluorescence organic light-emitting diodes with CIE y below 0.4, C. Chan et al, Nat. Commun., 9:5036 (2018); DOI: 10.1038/s41467-018-07482-6.
  2. A perspective on blue TADF materials based on carbazole-benzonitrile derivatives for efficient and stable OLEDs, C. Yin et al., Appl. Phys. Lett., 116, 120503 (2020); DOI: 10.1063/1.5143501.
  3. Effect of ortho-biphenyl substitution on the excited state dynamics of a multi-carbazole TADF molecule, S. Woo et al., J. Mater. Chem. C, 8, 12075-12084 (2020); DOI: 10.1039/D0TC02627A.

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