We fabricated organic light-emitting diodes (OLEDs) with the thermally activated delayed fluorescence (TADF) mate- rial of 4CzlPN, Which show better stability compared with the 4,4'-Bis(carbazol-9-yl)biphenyl ...
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We fabricated organic light-emitting diodes (OLEDs) with the thermally activated delayed fluorescence (TADF) mate- rial of 4CzlPN, Which show better stability compared with the 4,4'-Bis(carbazol-9-yl)biphenyl (CBP) based devices. The half lifetime of the device using 4CzlPN as host material has doubled, and a slower voltage rise compared with that of CBP-based devices has been achieved, which indicates the improvement of stability. We attribute the better sta- bility to the good film morphology and difficult crystallization property of 4CzlPN. Our results suggest that employing the 4CzlPN as host material can be a promising way of fabricating OLEDs with longer operation lifetime.
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