High-triplet-energy bipolar host materials based on phosphine oxide derivatives for efficient sky-blue thermally activated delayed fluorescence organic light-emitting diodes with reduced roll-off
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We designed and synthesized two new ambipolar host materials, namely CzPO and Cz3PO . Combining CzPO and Cz3PO with CzTRZ2 as the emitter resulted in improved maximum external quantum efficiencies of 13.1% and 13.2%, respectively, together with small efficiency roll-offs, while the device based on bis[2-(diphenylphosphino)phenyl]ether oxide ( DPEPO ) as host showed a much more pronounced efficiency roll-off.
Kim , J U , Wong , M Y , Kumar , S , Hayes , O , Duncan , F , Chan , C-Y , Wong , B Y-W , Ye , H , Cui , L-S , Nakanotani , H , Zysman-Colman , E & Adachi , C 2019 , ' High-triplet-energy bipolar host materials based on phosphine oxide derivatives for efficient sky-blue thermally activated delayed fluorescence organic light-emitting diodes with reduced roll-off ' , Chemistry Letters , vol. 48 , no. 10 , pp. 1225-1228 . https://doi.org/10.1246/cl.190412
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DescriptionThis work was supported by a grant fund from the Regional Innovation Eco-System Program sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan, JST ERATO (Grant Number JPMJER1305), the International Institute for Carbon Neutral Energy Research (WPI-I2CNER) sponsored by MEXT, and JSPS KAKENHI (Grant Numbers 00H00000). EZ-C the EPSRC (EP/R035164/1; EP/P010482/1) and the University of St Andrews and for SK the European Commission Marie Skłodowska-Curie Individual Fellowship (MCIF; No. 748430- THF-OLED)
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