LiF/Al cathodes and the effect of LiF thickness on the device characteristics and built-in potential of polymer light-emitting diodes

We report the characteristics of a series of polymer light-emitting diodes, fabricated with LiF/Al cathodes and differing only by the thickness of the LiF interlayer (0 nm⩽d⩽11 nm). Electroabsorption studies of the internal electrostatic potential give direct evidence of a sizable reduction of the c...

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Bibliographic Details
Published in:Applied physics letters 2000-11, Vol.77 (19), p.3096-3098
Main Authors: Brown, T. M., Friend, R. H., Millard, I. S., Lacey, D. J., Burroughes, J. H., Cacialli, F.
Format: Article
Language:English
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Summary:We report the characteristics of a series of polymer light-emitting diodes, fabricated with LiF/Al cathodes and differing only by the thickness of the LiF interlayer (0 nm⩽d⩽11 nm). Electroabsorption studies of the internal electrostatic potential give direct evidence of a sizable reduction of the cathodic barrier height brought about by the LiF films. These results also correlate with photoemission experiments [S. E. Shaheen, G. E. Jabbour, M. M. Morrell, Y. Kawabe, B. Kippelen, N. Peyghambarian, M. F. Nabor, R. Schlaf, E. A. Mash, and N. R. Armstrong, J. Appl. Phys. 84, 2324 (1998)] and with the electroluminescence performance of the diodes.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1323741