@article{06a7d37b19da4495936e07e5e6cd4edf,
title = "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",
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.",
author = "Kim, {Jong Uk} and Wong, {Michael Y.} and Shiv Kumar and Hayes, {Oliver G.} and Finlay Duncan and Chan, {Chin Yiu} and Wong, {Ben Yiu Wing} and Hao Ye and Cui, {Lin Song} and Hajime Nakanotani and Eli Zysman-Colman and Chihaya Adachi",
note = "Funding Information: This 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 Sk{\l}odowska-Curie Individual Fellowship (MCIF; No. 748430- THF-OLED). Funding Information: This work was supported by a grant fund from the Regional Innovation Eco-System Program sponsored by the Ministry Figure 6. Current densityvoltage (JV ) characteristics of (a) hole-only devices (HODs) and (b) electron-only devices (EODs) based on the CzPO, Cz3PO and DPEPO hosts. Publisher Copyright: {\textcopyright} 2019 The Chemical Society of Japan.",
year = "2019",
doi = "10.1246/cl.190412",
language = "English",
volume = "48",
pages = "1225--1228",
journal = "Chemistry Letters",
issn = "0366-7022",
publisher = "The Chemical Society of Japan",
number = "10",
}