FREE shipping to on qualifying orders when you spend or more, processed by Ossila BV. All prices ex. VAT. Qualifying orders ship free worldwide! Fast, secure, and backed by the Ossila guarantee. It looks like you are visiting from , click to shop in or change country. Orders to the EU are processed by our EU subsidiary.

It looks like you are using an unsupported browser. You can still place orders by emailing us on, but you may experience issues browsing our website. Please consider upgrading to a modern browser for better security and an improved browsing experience.

Product Code M2217A1-250mg
Price £420 ex. VAT

4CzBN, sky-blue TADF fluorescence emitter

High-purity (>99.0%) and available online for priority dispatch

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, see our spectrometer application notes.

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

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



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.
Return to the top