Improved efficiency of organic light-emitting diodes using CoPc buffer layer

Po Ching Kao, Sheng Yuan Chu, Zong Xian You, S. J. Liou, Chan An Chuang

研究成果: Conference article同行評審

32 引文 斯高帕斯(Scopus)


In this paper, the remarkable improvements in turn-on voltage and luminance have been demonstrated in an organic light-emitting diode (OLED) using cobalt phthalocyanine (CoPc) layer as a hole injection layer (HIL) in a device structure of ITO/CoPc/NPB (60 nm)/Alq3 (75 nm)/LiF (1 nm)/Al (200 nm). The J-V, L-V and ηp-V characteristics were measured at room temperature with a thickness variation of CoPc layer. The improvement of the luminance intensity by a factor of more than two has been obtained and the turn-on voltage at 1 cd/m2 decreased about 1 V with the CoPc layer. We propose that such an improvement is mainly due to the relative energy level of the highest-occupied molecular orbital (HOMO) band between that of the NPB hole transport layer (HTL) and the Fermi level of ITO anode, leading to enhance the hole injection from the ITO to organic layer.

頁(從 - 到)249-253
期刊Thin Solid Films
出版狀態Published - 2006 3月 1
事件Proceedings of the Third Asian Conference on Chemical Vapor Deposition (Third Asian-CVD), Third Asian CVD -
持續時間: 2004 11月 122004 11月 14

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 表面和介面
  • 表面、塗料和薄膜
  • 金屬和合金
  • 材料化學


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