4CzFCN, or 2,3,4,6-Tetra(9H-carbazol-9-yl)-5-fluorobenzonitrile (CAS 1819362-10-1), is a thermally activated delayed fluorescence (TADF) emitter that produces blue light. It is supplied as a sublimed deep yellow powder or crystals with a purity above 99.0% by HPLC.
Structurally it is closely related to the green emitter 4CzIPN, except that a fluorine atom takes the place of one cyano group. Because fluorine withdraws electrons less strongly than a nitrile, the emission shifts towards blue. The fluorine also makes the molecule more hydrophobic and more soluble, so 4CzFCN can be processed from solution in most aromatic solvents.
In a 10 wt% CzSi host its calculated PLQY reaches 100%, with a small ΔEST of 0.06 eV. A reported solution-processed device using 4CzFCN in a CDBP host achieved a maximum EQE of 20.8% and a maximum current efficiency of 55.3 cd/A.
- Emissive dopant in blue TADF organic light-emitting diodes.
- Fabrication of solution-processed OLED devices using aromatic solvents.
- Research into blue and white TADF-OLEDs based on exciplex host systems.
- Photophysical studies of carbazole-based TADF materials with small singlet-triplet energy gaps.
| Brand | Ossila |
|---|---|
| CAS number | 1819362-10-1 |
| Molecular formula | C55H32FN5 |
| Purity | Sublimed >99.0% (HPLC) |
| Category | — |
| Pack sizes | 100 mg, 250 mg, 500 mg, 1 g |
| Physical form | Deep yellow powder/crystals |
| Storage | — |
- Product code: M2331A1
- Full name: 2,3,4,6-Tetra(9H-carbazol-9-yl)-5-fluorobenzonitrile
- Molecular weight: 781.87 g/mol
- Absorption: λmax 307 nm in THF
- Fluorescence: λem 471 nm in film
- HOMO/LUMO: HOMO = 6.31 eV, LUMO = 3.49 eV
- Glass transition temperature: Tg = 179 ℃
- Max. EQE: 20.8%
- Max. current efficiency: 55.3 cd/A
- Max. power efficiency: 38.6 lm/W
Refer to the 4CzFCN MSDS sheet for safe handling and storage information.
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