S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
High-Performance Flexible Organic Light-Emitting Diodes Using Amorphous Indium Zinc Oxide Anode
- Kang, Jae-Wook; Jeong, Won-Ik; Kim, Jang-Joo; Kim, Han-Ki; Kim, Do-Geun; Lee, Gun-Hwan
- Issue Date
- Electrochemical Society
- Electrochem. Solid-State Lett., 10, J75 (2007)
- organic light emitting diodes; zinc compounds; III-V semiconductors; indium compounds; anodes; electrical conductivity; electrical resistivity
- We demonstrate a high-performance flexible organic light-emitting diode (OLED) employing amorphous indium zinc oxide (IZO) anode. The amorphous IZO on flexible polycarbonate (PC) substrate shows similar electrical conductivity and optical transmittance with commercial (ITO) glass, even though it was prepared at <50°C. Moreover, it exhibits little resistance change during 5000 bending cycles, demonstrating good mechanical robustness. A green phosphorescent OLED fabricated on amorphous IZO on flexible PC shows maximum external quantum efficiency of ext=13.7% and power efficiency of p=32.7 lm/W, which are higher than a device fabricated on a commercial ITO on glass (ext=12.4% and p=30.1 lm/W) and ITO on flexible PC (ext=8.5% and p =14.1 lm/W). The mechanical robustness and low-temperature deposition of IZO combined with high OLED performance clearly manifest that the amorphous IZO is a promising anode material for flexible displays.