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Chemical stabilization of doping in conjugated polymers
Umeå University, Faculty of Science and Technology, Department of Physics. (The Organic Photonics and Electronics Group)
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Physics. (The Organic Photonics and Electronics Group)
2010 (English)In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 11, no 6, 1079-1087 p.Article in journal (Refereed) Published
Abstract [en]

Conjugated polymers can be electrochemically doped to high-conductivity states under applied voltage, but such in situ formed doping structures are dynamic and dissipate when the formation voltage is removed. For some applications it is highly desirable to permanently stabilize the doping after its formation. Here, we report and compare results on four different approaches to chemical stabilization of an emissive and rectifying p–n junction doping structure in a light-emitting electrochemical cell (LEC) application: (i) polymerization of the dopant counter-ions, (ii) polymerization of the counter-ions utilizing a radical-initiator compound, (iii) polymerization of the ion-transport material, and (iv) polymerization of both the counter-ions and the ion-transport material utilizing a radical-initiator compound. We found that approach (i) resulted in LEC devices with poor stability, current rectification and light-emission, and that approach (ii) solely yielded a notable improvement in the light-emission. Approach (iii) resulted in good current rectification and stability, but the overall best results were clearly attained with approach (iv) as such stabilized LEC devices exhibited a respectable current rectification ratio of 2000, as well as a decent light-emission efficiency and long-term stability under idle conditions.

Place, publisher, year, edition, pages
Elsevier B.V. , 2010. Vol. 11, no 6, 1079-1087 p.
Keyword [en]
Doping, p–n Junction, Chemical stabilization, Light-emitting electrochemical cell, Ion-pair monomer, Superyellow
Identifiers
URN: urn:nbn:se:umu:diva-35842DOI: 10.1016/j.orgel.2010.03.009ISI: 000277935200017OAI: oai:DiVA.org:umu-35842DiVA: diva2:349638
Available from: 2010-09-07 Created: 2010-09-07 Last updated: 2017-12-12Bibliographically approved

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Tang, ShiIrgum, KnutEdman, Ludvig
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CiteExportLink to record
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  • apa
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