CAS Number 1996609-93-8
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.
| 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
| 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 of 2,3,5,6-tetrakis(carbazol-9-yl)benzonitrile (4CzBN), 1996609-93-8.
| 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 |
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