4CzPN (3,4,5,6-tetrakis(carbazol-9-yl)-1,2-dicyanobenzene, CAS 1416881-51-0) is a green-emitting thermally activated delayed fluorescence (TADF) material for OLED research. It offers an alternative to the related emitters 4CzIPN and 4CzTPN, and together with them forms a set of three isomers within the carbazolyl benzonitrile (CBC) family, a group known for highly efficient TADF behaviour.
In 4CzPN the carbazolyl groups sit both adjacent to and opposite the nitrile groups, which is thought to give more delocalised orbital electrons than in its isomers. The four bulky carbazolyl units crowded side by side, however, create steric hindrance that can weaken their conjugation with the central benzene ring.
The material is an orange powder or crystalline solid with a melting point above 360 °C. It emits at 528 nm in toluene, and has a HOMO of 5.83 eV, a LUMO of 3.38 eV and a triplet energy of 2.50 eV. It is offered unsublimed at >98.0% (HPLC) or sublimed at >99% (HPLC) purity.
- Green dopant emitter in the emissive layer of TADF-OLED devices.
- Green emitting component in white OLEDs that combine multiple emissive layers.
- Co-dopant with TBRb in warm white OLED architectures using mCBP hosts.
- Research into external heavy-atom effects for high-efficiency TADF devices.
- Studies of carrier transport layers in solution-processed TADF devices.
| Brand | Ossila |
|---|---|
| CAS number | 1416881-51-0 |
| Molecular formula | C56H32N6 |
| Purity | Unsublimed >98.0% (HPLC), Sublimed >99% (HPLC) |
| Category | — |
| Pack sizes | 100 mg, 250 mg, 500 mg, 1 g |
| Physical form | Orange powder/crystals |
| Storage | — |
- Product code: M2221A2
- Full Name: 3,4,5,6-tetrakis(carbazol-9-yl)-1,2-dicyanobenzene
- Synonym: 1,2,3,4-tetrakis(carbazol-9-yl)-5,6-dicyanobenzene
- Molecular Weight: 788.27 g/mol
- Absorption: λmax 315, 325, 364 nm in toluene
- Fluorescence: λem 528 nm in toluene
- HOMO/LUMO: HOMO = 5.83 eV, LUMO = 3.38 eV; T1 = 2.50 eV
- Melting Point: >360 °C (lit.)
- Classification: Carbazole, TADF materials, Green dopant materials, Sublimed materials
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