4CzFCN, 2,3,4,6-Tetra(9H-carbazol-9-yl)-5-fluorobenzonitrile, has a similar structure to 4CzIPN, with the only difference that one of the cyano groups is replaced by a fluorine atom. The presence of fluorine atom promotes hydrophobicity and increases the solubility, and as a result, 4CzFCN can be solution processed in most of the aromatic solvents.
The weaker electron-withdrawing ability of fluorine compared to nitrile blue-shifts the emission, thus 4CzFCN is a TADF blue emitting material while 4CzIPN is green emitting. Calculated PLQY in 10 wt% CzSi host is 100% for 4CzFCN, with a small ΔEST of 0.06 eV.
|Molecular weight||781.87 g/mol|
|Absorption*||λmax 307 nm in THF|
|Fluorescene||λem 471 nm in film|
|HOMO/LUMO||HOMO = 6.31 eV, LUMO = 3.49 eV |
|Classification / Family||Carbazole, TADF blue emitter materials, Phosphorescent organic light-emitting devices (PHOLEDs), Sublimed materials|
|Purity||Sublimed >99.0% (HPLC)|
|Melting point||Tg = 179 ℃|
|Appearance||Deep yellow powder/crystals|
* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials for OLED devices.
|Device structure||ITO/PEDOT:PSS (30 nm)/PVK (15 nm)/CDBP:25% 4CzFCN (30 nm)/PO-T2T (50 nm)/LiF (0.8 nm)/Al (100 nm) |
|Max. Current Efficiency||55.3 cd/A|
|Max. Power Efficiency||38.6 Im/W|
|Sublimed (>99.0% purity)||M2331A1||100 mg||£169.00|
|Sublimed (>99.0% purity)||M2331A1||250 mg||£338.00|
|Sublimed (>99.0% purity)||M2331A1||500 mg||£576.00|
|Sublimed (>99.0% purity)||M2331A1||1 g||£979.00|
MSDS Documentation4CzFCN MSDS Sheet
Literature and Reviews
- 20% External Quantum Efficiency in Solution-Processed Blue Thermally Activated Delayed Fluorescent Devices, Y. Cho et al., Adv. Funct. Mater., 25 (43), 6786-6792 (2015); DOI: 10.1002/adfm.201502995.
- Blue and White Solution-Processed TADF-OLEDs with Over 20% EQE, Low Driving Voltages and Moderate Efficiency Decline based on Interfacial Exciplex Hosts, Z. He et al., J. Mater. Chem. C, 7, 11806-11812 (2019); DOI: 10.1039/C9TC03468D.
- Purely Organic Thermally Activated Delayed Fluorescence Materials for Organic Light-Emitting Diodes, M. Wong et al., Adv. Mater., 29 (22), 1605444 (2017); DOI: 10.1002/adma.201605444..
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