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.

Keywords

CathodeElectroluminescenceMaterials scienceOptoelectronicsLuminanceQuantum tunnellingLayer (electronics)OLEDElectroluminescent displayAluminiumQuantum efficiencyOpticsNanotechnologyChemistryComposite materialPhysics

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Publication Info

Year
1997
Type
article
Volume
71
Issue
13
Pages
1762-1764
Citations
347
Access
Closed

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Ghassan E. Jabbour, Yutaka Kawabe, Sean E. Shaheen et al. (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

Identifiers

DOI
10.1063/1.119392