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4CzPN is one of three isomers (including 4CzTPN and 4CzIPN) which belong to the carbazolyl benzonitriles (CBC) family. CBC family members are well known, highly efficient thermally activated delayed fluorescence (TADF) materials.
The carbazolyl groups are located next and opposite to the nitrile groups, electrons in 4CzPN orbitals are supposedly more delocalized than its isomers. However, with four bulky carbazolyl groups next to each other, the steric hindrance can reduce the conjugation of the carbazolyl groups to the centre benzene ring.
A new way towards high-efficiency thermally activated delayed fluorescence devices via external heavy-atom effect, W. Zhang et al., Sci. Rep., 6, 30178 (2016); doi: 10.1038/srep30178.
High-efficiency white organic light-emitting diodes using thermally activated delayed fluorescence, J. Nishide et al., Appl. Phys. Lett. 104, 233304 (2014); doi: 10.1063/1.4882456.
Exciton-Adjustable Interlayers for High Efficiency, Low Efficiency Roll-Off, and Lifetime Improved Warm White Organic Light-Emitting Diodes (WOLEDs) Based on a Delayed Fluorescence Assistant Host, Z. Wang et al., Adv. Funct. Mater., 28, 1706922 (2018); DOI: 10.1002/adfm.201706922.
The Effect of Carrier Transport Layer on the Electroluminescent Properties of Solution-Processed Thermally Activated Delayed Fluorescent Device based on 4CzPN, L. Zhang et al., Phys. Status Solidi B, 259 (10), 2200072 (2022); DOI: 10.1002/pssb.202200072.
Interplay between Singlet and Triplet Excited States in Interface Exciplex OLEDs with Fluorescence, Phosphorescence, and TADF Emitters, Z. Zhou et al., Adv. Funct. Mater., 2211059 (2022); DOI: 10.1002/adfm.202211059.
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