4TCzBN, or 2,3,5,6-Tetrakis(3,6-di-tert-butyl-9H-carbazol-9-yl)benzonitrile (CAS 2055722-93-3), is a thermally activated delayed fluorescence (TADF) material from the carbazolyl benzonitrile family. It is employed in high-efficiency blue and white TADF-OLED devices and is supplied as a sublimed yellow powder/crystals with purity above 99.0% by 1H NMR.
Within the molecule, the carbazolyl groups act as electron donors and the nitrile group as an electron acceptor. The bulky tert-butyl units form a protective shell around the luminophore, keeping neighbouring molecules apart. This spacing is thought to lower the likelihood of triplet-polaron annihilation (TPA), which helps raise device efficiency and stability.
In reported sky-blue devices combining 4TCzBN with 2,4-2CzBN or 3,5-2CzBN in the emissive layer, maximum EQE values of 21.5% and 20.1% were achieved, with maximum power efficiencies of 42.0 lm/W and 34.5 lm/W respectively.
- Emissive material in highly efficient blue TADF-OLED devices.
- Component in white TADF-OLED devices.
- Emissive layer material in sky-blue OLEDs paired with 2,4-2CzBN or 3,5-2CzBN.
- Research into reducing triplet-polaron annihilation to improve OLED efficiency and stability.
| Brand | Ossila |
|---|---|
| CAS number | 2055722-93-3 |
| Molecular formula | C87H97N5 |
| Purity | Sublimed >99.0% (1H NMR) |
| Category | — |
| Pack sizes | 100 mg, 250 mg, 500 mg |
| Physical form | Yellow powder/crystals |
| Storage | — |
- Product code: M2218A2
- Full name: 2,3,5,6-Tetrakis(3,6-di-tert-butyl-9H-carbazol-9-yl)benzonitrile
- Molecular weight: 1212.73 g/mol
- Absorption: λmax 295 nm, 345 nm and 417 nm in toluene
- Fluorescence: λem 483 nm in toluene
- HOMO/LUMO: HOMO = 5.48 eV, LUMO = 2.73 eV, T1 = 2.60 eV
- Glass transition: Tg = 322 °C (lit.)
- Classification: Carbazole, Benzonitrile, TADF materials, Blue dopant materials, Sublimed materials
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