The influence of LiF thickness on the built-in potential of blue polymer light-emitting diodes with LiF/Al cathodes
Autor: | Thomas M. Brown, D. J. Lacey, Richard H. Friend, Franco Cacialli, J. H. Burroughes, I. S. Millard |
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Rok vydání: | 2001 |
Předmět: |
Conductive polymer
Chemistry business.industry Mechanical Engineering Metals and Alloys chemistry.chemical_element Lithium fluoride Electroluminescence Condensed Matter Physics Cathode Electronic Optical and Magnetic Materials law.invention chemistry.chemical_compound Optics Mechanics of Materials law Aluminium Materials Chemistry Work function business Diode Light-emitting diode |
Zdroj: | Synthetic Metals. 124:15-17 |
ISSN: | 0379-6779 |
DOI: | 10.1016/s0379-6779(01)00412-x |
Popis: | We use electroabsorption to investigate the built-in potential of polymer light-emitting diodes with LiF/Al cathodes, as a function of the LiF thickness d . We find that the built-in potential increases with d , reaching a plateau at d ≤7 nm. The results, obtained on finished devices, imply a correspondent lowering of the cathode work function, which correlates with the device luminance and efficiency. Consequently, we demonstrate that the improvement in device performance, brought about by the thin LiF layers, is predominantly attributable to the reduction of the barrier height to electron injection. |
Databáze: | OpenAIRE |
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