3CzBN, also known as 2,4,6-Tri(9H-carbazol-9-yl)benzonitrile (CAS 1799923-03-7), is a donor-acceptor host material for blue thermally activated delayed fluorescence (TADF) OLEDs. Its benzonitrile core carries three electron-donating carbazole groups positioned meta to one another, a layout intended to spread electronic delocalization over the whole molecule. It is supplied as an off-white powder in unsublimed grade (>98%, HNMR).
The compound has a ΔE ST of 0.21 eV. In room-temperature toluene it does not show TADF emission, but freezing the solvent brings out both phosphorescence and thermally activated emission bands. Its TADF behaviour is also switchable by solvent: the 1CT–3LE gap falls from 0.20 eV in toluene to 0.09 eV in acetonitrile, where 3CzBN becomes TADF active.
As a high-triplet-energy host with good carrier injection and transport, 3CzBN has been used with a 4TCzBN dopant in blue TADF devices reaching a maximum external quantum efficiency of 14.8%, a maximum power efficiency of 29.5 lm W −1 and an onset voltage of 2.8 V.
- Host material in the emissive layer of blue TADF OLEDs.
- Host for 4TCzBN-doped blue TADF devices targeting low onset voltage.
- Research into solvent-dependent TADF activation in carbazole benzonitrile derivatives.
- Photophysical studies of singlet-triplet energy gaps and solvent-freezing effects.
| Brand | Ossila |
|---|---|
| CAS number | 1799923-03-7 |
| Molecular formula | C43H26N4 |
| Purity | Unsublimed >98% (HNMR) |
| Category | — |
| Pack sizes | 250 mg, 500 mg, 1 g |
| Physical form | Off-white powder |
| Storage | — |
- Product code: M2502B1
- Molecular weight: 598.69 g/mol
- Synonyms: 2,4,6-Tri(9H-carbazol-9-yl)benzonitrile
- Fluorescence: λem 432 nm (Toluene)
- HOMO/LUMO: HOMO = 5.75 eV, LUMO = 2.61 eV (ΔE ST = 0.21 eV)
- Thermal properties: Tg = 153 °C, Td = 401 °C
- Classification / Family: Cyanoarenes, Carbazole derivatives, TADF blue host
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