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Applied Physics Letters / Volume 71 / Issue 13

Appl. Phys. Lett. 71, 1762 (1997); http://dx.doi.org/10.1063/1.119392 (3 pages)

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, and N. Peyghambarian

Optical Sciences Center, University of Arizona, Tucson, Arizona, 85721

(Received 9 April 1997; accepted 25 July 1997)

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. © 1997 American Institute of Physics.

© 1997 American Institute of Physics

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KEYWORDS and PACS

Keywords

organic compounds, light emitting diodes, cathodes

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.119392

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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