S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Electrical and Computer Engineering (전기·정보공학부) Others_전기·정보공학부
Efficient Blue Organic Light-Emitting Diodes using Newly Developed Pyrene-Based Electron Transport Materials
- Oh, Hyoung-Yun; Lee, Changhee; Lee, Seonghoon
- Issue Date
- Org. Electron. 10 (2009) 163
- We synthesized new kinds of pyrene-based electron transport materials: 1,6-di(pyridin-3-
yl)-3,8-di(naphthalen-1-yl)pyrene (N1PP) and 1,6-di(pyridin-3-yl)-3,8-di(naphthalen-2-
yl)pyrene (N2PP). The external quantum efficiencies of the device with these electron
transport materials increase by more than 50% at 1 mA cm 2 compared with those of the
device with representative Alq3 as an electron transport material. The enhanced quantum
efficiency is due to a balanced charge recombination in an emissive layer. Electron mobilities
in N1PP and N2PP films are three times higher than that in Alq3. Highly enhanced
power efficiency is achieved due to a low electron injection barrier and a high electron
mobility. We find that the luminance degradation in the blue OLEDs is correlated with
the HOMO energy levels of electron transport materials.
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