Highly efficient and bright organic electroluminescent devices with an aluminum cathode

G. E. Jabbour, Y. Kawabe, S. E. Shaheen, J. F. Wang, M. M. Morrell, B. Kippelen, N. Peyghambarian

Research output: Contribution to journalArticle

341 Scopus citations

Abstract

The electron injection process, which limits the electroluminescent performance of organic devices, has been enhanced tremendously by inserting a layer of LiF with appropriate thickness between the cathode and a quinacridone doped organic layer. Devices with an Al/LiF cathode demonstrated a luminance in excess of 20 000 cd/m2 and an external quantum efficiency of 3%, which is comparable to devices with a Mg/LiF cathode. These devices show maximum luminance of 45 000 cd/m2 prior to failure in continuous bias operation. For the same LiF thickness, the operating voltage for devices with Al/LiF was lower than the corresponding operating voltage for devices with Mg/LiF or Mg alone. Tunneling theory is used to explain this enhancement.

Original languageEnglish (US)
Pages (from-to)1762-1764
Number of pages3
JournalApplied Physics Letters
Volume71
Issue number13
DOIs
StatePublished - Sep 29 1997

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Jabbour, G. E., Kawabe, Y., Shaheen, S. E., Wang, J. F., Morrell, M. M., Kippelen, B., & Peyghambarian, N. (1997). Highly efficient and bright organic electroluminescent devices with an aluminum cathode. Applied Physics Letters, 71(13), 1762-1764. https://doi.org/10.1063/1.119392