4CzBN
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 | 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 |
|
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 for OLED devices.
Chemical Structure
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 
|
| 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 MSDS sheetPricing
| Grade | Order Code | Quantity | Price |
| Sublimed (>99.0% purity) | M2217A1 | 250 mg | £315.00 |
| Sublimed (>99.0% purity) | M2217A1 | 500 mg | £535.00 |
| Sublimed (>99.0% purity) | M2217A1 | 1 g | £857.00 |
Literature and Reviews
- 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 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.