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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.
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.
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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.
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