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

31 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)249-253
頁數5
期刊Thin Solid Films
498
發行號1-2
DOIs
出版狀態Published - 2006 三月 1
事件Proceedings of the Third Asian Conference on Chemical Vapor Deposition (Third Asian-CVD), Third Asian CVD -
持續時間: 2004 十一月 122004 十一月 14

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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