General Information
| CAS number | 1416881-52-1 |
| Chemical formula | C56H32N6 |
| Molecular weight | 788.89 g/mol |
| Absorption | λmax 365 nm in acetonitrile |
| Fluorescene | λem 551 nm in acetonitrile |
| HOMO/LUMO | HOMO = 5.8 eV, LUMO = 3.4 eV [1] |
| Synonyms | 2,4,5,6-Tetra(9H-carbazol-9-yl)isophthalonitrile |
| Classification / Family | Carbazole, TADF green emitter materials, Phosphorescent organic light-emitting devices (PHOLEDs), Sublimed materials |
Product Details
| Purity | Sublimed >99.5% (HPLC) |
| Melting point | TGA: >300 °C (0.5% weight loss) |
| Color | Orange-yellow powder/crystals |
*Sublimation is a technique used to obtain ultra pure-grade chemicals. For more details about sublimation, please refer to the Sublimed Materials for OLED devices page.
Applications
Out of its three isomers, 4CzIPN has the highest photo-luminescence quantum efficiency (PLQY) of above 90%. This is due to the wide dispersion the highest-occupied molecular orbital (HOMO) over the donor moieties. Relatively short excited-state lifetime of delayed emission was reported. Additionally, higher external quantum efficiency (EQE) was observed by using 4CzIPN as an emitter in TADF-OLED devices.
Despite its low solubility in most of the aromatic solvents, 4CzIPN is also solution-processable in solvents such as dichloromethane or chloroform. This is due to the structure distortion of the carbazole units caused by steric hindrance.
| Device structure | ITO (70 nm)/(4 wt% ReO 3 ):mCP (50 nm)/mCP (15 nm)/mCP:B3PyMPM:(5 wt% 4CzIPN) (30 nm)/B3PYMPM (20 nm)/(4 wt% Rb2CO3):B3PYMPM (35 nm)/Al (100 nm) [3] |
| Colour |
Green 
|
| Max. Current Efficiency | 94.5 cd/A |
| Max. EQE | 29.6% |
| Max. Power Efficiency | 88.6 Im/W |
| Device structure | ITO (50 nm)/PEDOT:PSS (60 nm)/poly(9-vinylcarbazole) (15 nm)/SiCz:4CzIPN (30 nm)/TSPO1 (35 nm)/LiF (1 nm)/Al (200 nm) [4] |
| Colour |
Green
|
| Max. EQE | 26% |
| Max. Power Efficiency | 63.4 Im/W |
| Device structure | ITO(130 nm)/TAPC (35 nm)/CBP (5 nm)/5 wt% 4CzIPN doped CBP (5 nm)/B4PyPPM (65 nm)/LiF (0.8 nm)/Al (100 nm) [5] |
| Colour |
Green
|
| Max. Current Efficiency | 83.2 cd/A |
| Max. EQE | 25.7% |
| Max. Power Efficiency | 106.9 Im/W |
Literature and Reviews
- Promising operational stability of high-efficiency organic light-emitting diodes based on thermally activated delayed fluorescence, H. Nakanotani et al., Sci Rep., 3: 2127 (2013); doi: 10.1038/srep02127.
- Solvent Effect on Thermally Activated Delayed Fluorescence by 1,2,3,5-Tetrakis(carbazol-9-yl)-4,6-dicyanobenzene, R. Ishimatsu et al., J. Phys. Chem. A, 117, 5607−5612 (2013); DOI: 10.1021/jp404120s.
- A Fluorescent Organic Light-Emitting Diode with 30% External Quantum Efficiency, J-W. Sun et al., Adv. Mater., 26, 5684–5688 (2014); DOI: 10.1002/adma.201401407.
- High Efficiency in a Solution-Processed Thermally Activated Delayed-Fluorescence Device Using a Delayed-Fluorescence Emitting Material with Improved Solubility, Y-J. Cho et al., Adv. Mater., 26, 6642–6646 (2014); DOI: 10.1002/adma.201402188.
- High-Performance Green OLEDs Using Thermally Activated Delayed Fluorescence with a Power Effi ciency of over 100 lmW−1, Y. Seino et al; Adv. Mater., 28, 2638–2643 (2016); DOI: 10.1002/adma.201503782.