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Kim, Gyeong Woo,Son, Young Hoon,Yang, Hye In,Park, Jin Hwan,Ko, Ik Jang,Lampande, Raju,Sakong, Jeonghun,Maeng, Min-Jae,Hong, Jong-Am,Lee, Ju Young,Park, Yongsup,Kwon, Jang Hyuk American Chemical Society 2017 Chemistry of materials Vol.29 No.19
<P>In this paper, we report two new phenanthroline-based compounds, 1,4-bis(2-phenyl-1,10-phenanthrolin-4-yl)benzene (<I>p</I>-bPPhenB) and 1,3-bis(2-phenyl-1,10-phenanthrolin-4-yl)benzene (<I>m</I>-bPPhenB), for the charge generation unit of tandem organic light-emitting diodes (OLEDs). These two compounds exhibited high electron mobility of (5.8–4.4) × 10<SUP>–3</SUP> cm<SUP>2</SUP>/(V s), a very small injection barrier at the p–n junction interface, a high glass transition temperature of 123.9–182.1 °C, and exceptionally good operational stability. Because of such excellent characteristics, a single-stack red phosphorescent OLED (PhOLED) with <I>p</I>-bPPhenB showed a low driving voltage (2.7 V) and significantly improved maximum power efficiency (56.8 lm/W), external quantum efficiency (30.8%), and device lifetime (LT<SUB>95</SUB>, 130 h) compared to those of the control device using bathophenanthroline (Bphen) (3.7 V, 39 lm/W, 27.1%, and 13 h). Furthermore, a two-stack (tandem) red PhOLED using <I>p</I>-bPPhenB in the charge generation unit exhibited superior charge generation as well as electron transport properties and excellent device performances (5.0 V, 54.0 lm/W, 56.1%) compared to those of the tandem device using Bphen (6.2 V, 45.2 lm/W, 53.3%).</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2017/cmatex.2017.29.issue-19/acs.chemmater.7b02655/production/images/medium/cm-2017-026556_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm7b02655'>ACS Electronic Supporting Info</A></P>