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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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Jong Uk Kim, Michael Y. Wong, Shiv Kumar, Oliver Hayes, Finlay Duncan, Chin-Yiu Chan, Ben Yiu-Wing Wong, Hao Ye, Lin-Song Cui, Hajime Nakanotani, Eli Zysman-Colman, Chihaya Adachi

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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.


Original languageEnglish
Pages (from-to)1225-1228
JournalChemistry Letters
Issue number10
Early online date21 Sep 2019
Publication statusPublished - Oct 2019

    Research areas

  • Thermally activated delayed fluorescence (TADF), Organic light-emitting diode (OLED), Ambipolar host

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ID: 259378381