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Identifying and Alleviating Electrochemical Side-Reactions in Light-Emitting Electrochemical Cells
Dept. of Physics Umeå University.
Dept. of Physics Umeå University.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology. (Transport and Separations Group)ORCID iD: 0000-0002-2773-5096
Dept. of Physics Umeå University.
2008 (English)In: Journal of the American Chemical Society., Vol. 130, no 13, 4562-4568 p.Article in journal (Refereed) Published
Abstract [en]

We demonstrate that electrochemical side-reactions involving the electrolyte can be a significant and undesired feature in light-emitting electrochemical cells (LECs). By direct optical probing of planar LECs, comprising Au electrodes and an active material mixture of {poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) + poly(ethylene oxide) (PEO) + KCF3SO3}, we show that two direct consequences of such a side-reaction are the appearance of a -degradation layer- at the negative cathode and the formation of the light-emitting p−n junction in close proximity to the cathode. We further demonstrate that a high initial drive voltage and a high ionic conductivity of the active material strongly alleviate the extent of the side reaction, as evidenced by the formation of a relatively centered p−n junction, and also rationalize our findings in the framework of a general electrochemical model. Finally, we show that the doping concentrations in the doped regions at the time of the p−n junction formation are independent of the applied voltage and relatively balanced at 0.11 dopants/MEH-PPV repeat unit in the p-type region and 0.15 dopants/MEH-PPV repeat unit in the n-type region.

Place, publisher, year, edition, pages
2008. Vol. 130, no 13, 4562-4568 p.
Keyword [en]
LEC, organic electronics, light-emitting electrochemical cell
National Category
Natural Sciences
URN: urn:nbn:se:liu:diva-44856DOI: 10.1021/ja7113294Local ID: 77890OAI: diva2:265718
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2013-10-07

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Robinson, Nathaniel D
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Surface Physics and ChemistryThe Institute of Technology
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