2CzPN (1,2-Bis(carbazol-9-yl)-4,5-dicyanobenzene, CAS 1416881-50-9) is a thermally activated delayed fluorescence (TADF) material that emits in the sky blue region. Ossila supplies it in sublimed grade with purity above 99% (HPLC), as pale yellow crystals or powder, for organic electronics research.
The molecule pairs two electron-donating carbazolyl groups with an electron-withdrawing dicyanobenzene core. Steric hindrance twists the carbazolyl units out of the dicyanobenzene plane, giving a small singlet-triplet gap (ΔE ST) of 0.09 eV. Because it carries fewer carbazolyl groups than 4CzIPN, its donor strength is lower and its emission peak moves to a shorter wavelength, 473 nm in toluene.
Beyond acting as a blue emitter, 2CzPN has been reported as a host or exciton harvester in orange phosphorescent, red quantum-dot, green exciplex and hybrid white devices, with a maximum EQE of 38.4% reported for a white OLED structure.
- Sky blue emitting layer material in TADF OLEDs.
- Host material for phosphorescent emitters such as (tbt)2Ir(acac) in orange OLEDs.
- Exciton harvester in the PVK host layer of red quantum-dot light-emitting diodes.
- Component of exciplex emitting layers in green OLEDs.
- Blue TADF component in hybrid white OLEDs.
| Brand | Ossila |
|---|---|
| CAS number | 1416881-50-9 |
| Molecular formula | C32H18N4 |
| Purity | Sublimed > 99% (HPLC) |
| Category | — |
| Pack sizes | 100 mg, 250 mg, 500 mg, 1 g |
| Physical form | Pale yellow crystals/powder |
| Storage | — |
- Product code: M2181A1
- Full name: 4,5-Bis(carbazol-9-yl)-1,2-dicyanobenzene
- Synonym: 1,2-Bis(carbazol-9-yl)-4,5-dicyanobenzene
- Molecular weight: 458.51 g/mol
- Absorption: λ max 380 nm in toluene
- Fluorescence: λ max 473 nm in toluene
- HOMO/LUMO: HOMO = 5.8 eV, LUMO = 3.0 eV; T1 = 2.5 eV
- ΔE ST: 0.09 eV
- Classification / Family: Blue emitting layer materials, Blue phosphorescent host materials, TADF materials
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