Diphenanthroline Electron Transport Materials for the Efficient Charge Generation Unit in Tandem Organic Light-Emitting Diodes
Gyeong Woo Kim,Young Hoon Son,Hye In Yang,Jin Hwan Park,Ik Jang Ko,Raju Lampande,Jeonghun Sakong,Min-Jae Maeng,Jong-Am Hong,Ju Young Lee,Yongsup Park,Jang Hyuk Kwon +11 more
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TLDR
In this article, the authors reported two new phenanthroline-based compounds, 1,4-bis(2-phenyl-1,10-phenanthrolin-4-yl)benzene (p-bPPhenB) and 1,3-bis (2-PNyl- 1,10phenanthuslin- 4-yl), for the charge generation unit of tandem organic light-emitting diodes (OLEDs).Abstract:
In this paper, we report two new phenanthroline-based compounds, 1,4-bis(2-phenyl-1,10-phenanthrolin-4-yl)benzene (p-bPPhenB) and 1,3-bis(2-phenyl-1,10-phenanthrolin-4-yl)benzene (m-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) × 10–3 cm2/(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 p-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 (LT95, 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 p-bPPhenB in the charge generation unit exhibited superior cha...read more
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Highly efficient blue thermally activated delayed fluorescence emitters based on symmetrical and rigid oxygen-bridged boron acceptors
TL;DR: In this article, two deep-blue thermally activated delayed fluorescence emitters, TDBA-Ac and DBA-DI, containing oxygen-bridged, symmetric and rigid boron acceptor moieties have been designed to have high photoluminescence quantum yield and narrow-band blue emission.
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Rigid Oxygen‐Bridged Boron‐Based Blue Thermally Activated Delayed Fluorescence Emitter for Organic Light‐Emitting Diode: Approach towards Satisfying High Efficiency and Long Lifetime Together
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