Product Code M2217A1
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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, however, 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 n.a.
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
Fluorescene 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

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. For more details about sublimation, please refer to the Sublimed Materials for OLED devices page.

Chemical Structure

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
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



Grade Order Code Quantity Price
Sublimed (>99.0% purity) M2104A1 250 mg £315.00
Sublimed (>99.0% purity) M2104A1 500 mg £535.00
Sublimed (>99.0% purity) M2104A1 1 g £857.00


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.

To the best of our knowledge the technical information provided here is accurate. However, Ossila assume no liability for the accuracy of this information. The values provided here are typical at the time of manufacture and may vary over time and from batch to batch.