5CzBN, or 2,3,4,5,6-penta(carbazol-9-yl)benzonitrile (CAS 1469700-24-0), is a blue dopant that emits light-blue fluorescence through thermally activated delayed fluorescence (TADF). It is a common choice for researchers fabricating high-efficiency TADF-OLEDs.
The molecule carries five bulky, electron-donating carbazolyl groups crowded around a central benzonitrile ring, which makes it strongly sterically hindered. It absorbs at 325 nm, 348 nm and 420 nm in DCM and emits at 488 nm in toluene, with a HOMO of 5.55 eV, a LUMO of 2.74 eV and a T1 of 2.68 eV.
The material is a yellow powder or crystals and comes in two grades: unsublimed at >98% and sublimed at >99.0% purity (1H NMR). In reported blue devices using an mCBP host, 5CzBN reached a maximum EQE of 18.0% and a power efficiency of 49.9 lm/W.
- Light-blue emissive dopant in the emitting layer of TADF-OLED devices.
- Guest emitter doped into mCBP host layers for blue OLED stacks.
- Research into thermally activated delayed fluorescence and reverse intersystem crossing in carbazole-based emitters.
- Studies of fluorescent emitters for all-fluorescent white OLEDs.
| Brand | Ossila |
|---|---|
| CAS number | 1469700-24-0 |
| Molecular formula | C67H40N6 |
| Purity | Unsublimed >98%; Sublimed >99.0% (1H NMR) |
| Category | — |
| Pack sizes | 100 mg, 250 mg, 500 mg, 1 g |
| Physical form | Yellow powder/crystals |
| Storage | — |
- Product code: M2219A2
- Full name: 2,3,4,5,6-penta(carbazol-9-yl)benzonitrile
- Synonyms: 5CzCN, 2,3,4,5,6-penta(9H-carbazol-9-yl)benzonitrile
- Molecular weight: 929.1 g/mol
- Absorption: λmax 325 nm, 348 nm and 420 nm in DCM
- Fluorescence: λem 488 nm in toluene
- HOMO/LUMO: HOMO = 5.55 eV, LUMO = 2.74 eV, T1 = 2.68 eV
- Glass transition temperature: Tg = 318 °C (lit.)
- Classification / Family: Carbazole, Phthalonitrile, TADF materials, Blue dopant materials, Sublimed materials
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