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.
|Molecular weight||763.9 g/mol|
|Absorption*||λmax 334 nm, 403 nm in toluene|
||λem 443 nm in toluene|
|HOMO/LUMO||HOMO = 5.79 eV, LUMO = 2.75 eV, T1 = 2.66 eV |
|Classification / Family||Carbazole, Phthalonitrile, TADF materials, Blue dopant materials, Sublimed materials|
|Purity||Sublimed >99.0% (1H NMR)|
|Melting point||Td = 455 °C (0.5% weight loss), Tg = 316 °C (lit.)
* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials for OLED devices.
|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) |
|Max. Current Efficiency||26.6 cd/A|
|Max. Power Efficiency||20.9 Im/W|
*For chemical structure information, please refer to the cited references.
|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.
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