Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Efficiency Improvement of Green Emitting OLED by Aquaregia Treatment of ITO Substrate

ITO 기판의 Aquaregia 처리에 의한 녹색발광 OLED의 효율 향상 연구

  • Choi, Gyu-Chae (Department of Electrical Engineering and NTRC, Dong-A University) ;
  • Kim, Dong-Eun (Department of Electrical Engineering and NTRC, Dong-A University) ;
  • Kim, Byoung-Sang (Department of Electrical Engineering and NTRC, Dong-A University) ;
  • Kwon, Young-Soo (Department of Electrical Engineering and NTRC, Dong-A University)
  • Published : 2008.07.16
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Abstract

ITO is widely used as an anode material in OLED, because of its good transparency, low electrical resistivity, high work function, and efficient hole injection properties. The interface between the electrode and the organic layer in the OLED effects the charge injection process and may influence the electrical and the luminance properties. Surface treatment of ITO, such as an Aquaregia treatment has been shown to enhance the efficiency, and luminance characteristics of the OLED. In this study, we investigated the effect of Aquaregia treatment. The fundamental structures of the OLED were ITO/NPB/$Alq_3$/LiF/Al. The current density-voltage-luminance, efficiency, and lifetime characteristics were measured with untreated and Aquaregia-treated ITO substrates. The Aquaregia treatment was found to enhance the performance of OLED. For the Aquaregia treated device, the maximum luminance and efficiency were increased by about 2 times compared to the untreated device. The mechanism of the Aquaregia treatment is discussed based on AFM analyses.

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