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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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Author(s)

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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Abstract

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.
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Original languageEnglish
Pages (from-to)1225-1228
JournalChemistry Letters
Volume48
Issue number10
Early online date21 Sep 2019
DOIs
Publication statusPublished - Oct 2019

    Research areas

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

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