Multilayer cathode for organic light-emitting devices

Xiufang Li, Zhenbo Deng*, Zheng Chen, Yumeng Shi, Denghui Xu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A thin layer of samarium (Sm) was introduced in the cathode fabrication of the organic light-emitting devices (OLEDs). An efficient cathode Sm/LiF/Al used to improve the performance of OLEDs was reported. Standard N,N′-bis(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl 4,4′-diamine (NPB)/tris-(8-hydroxyquinoline) aluminum (AlQ) devices with Sm/LiF/Al cathode showed dramatically enhanced electroluminescent (EL) brightness and efficiency. The optimized device with the 0.5 nm layer of Sm with the cathode structure of Sm/LiF/Al showed the improved power efficiency of 40% than the control device of the conventional LiF/Al cathode at 100 mA/cm2. The drive voltage of the device with the Sm/LiF/Al cathode was decreased about 2 V at 500 mA/cm2 compared with the conventional LiF/Al cathode device. The enhanced properties of the device with such a multilayer cathode are considered to the improved balance of electron/hole injection in the emitting layer.

Original languageEnglish (US)
Pages (from-to)323-326
Number of pages4
Issue number4
StatePublished - Oct 2008
Externally publishedYes


  • Electroluminescence (EL)
  • Exciton
  • Organic light-emitting devices (OLEDs)

ASJC Scopus subject areas

  • Human-Computer Interaction
  • Hardware and Architecture
  • Electrical and Electronic Engineering


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