Abstract
Recent developments in the field of thermally activated delayed fluorescence (TADF) emitter have led to significantly improved performances of hybrid solution processing prepared white organic light-emitting diodes (s-WOLEDs). Importantly, wide coverage of electroluminescent spectra and balanced transfer of carriers are conclusive factors to obtain high quality lighting sources. This paper demonstrated high quality s-WOLEDs grounded on blue TADF and red phosphorescent emitters. In optimal WOLED, Förster energy transfer (ET) distance and ET rate were calculated to be 1.81 nm and 1.29 × 106 s−1, respectively. Also, exciplex host were employed to decrease operation voltage and modulate carriers' distribution. The fabricated optimal solution-processed warm white electroluminescence device exhibited high color rendering index of 80 and maximum luminescent efficiencies up to 29.22 cd A−1, 28.68 lm W−1 and 13.5%. Furthermore, the Commission Internationale de I'Eclairage coordinates of this device are (0.39, 0.41) at the current density of 10 mA cm−2, while the turn-on voltage of this device is 3.0 V.
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