Date：2017-10-13 |
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【Academic writing Sharing 20171011】 |
Diphenanthroline Electron Transport Materials for Efficient
Charge Generation Unit in Tandem Organic Light Emitting Diodes
Article excerpt is from: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, and Jang Hyuk Kwon
Chem. Mater. 2017, in press
two new phenanthroline-based compounds, p-bPPhenB and 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/Vs, very small injection barrier at the P-N junction interface, high glass transition temperature of, and exceptionally good operational stability. Because of such excellent characteristics, a single stack red phosphorescent OLED (PhOLED) with p-bPPhenB showed 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 hours) compared to those of control device using bathophenanthroline (Bphen) (3.7 V, 39lm/W, 27.1%, and 13 hours). Furthermore, two-stack (tandem) red PhOLED by using p-bPPhenB in 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 that of tandem device using Bphen (6.2 V, 45.2 lm/W, 53.3%).
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