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Time-Resolved Chemical Mapping in Light-Emitting Electrochemical Cells
Linköping University, Department of Physics, Chemistry and Biology, Molecular Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-3899-4891
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-5365-6140
Linköping University, Department of Physics, Chemistry and Biology, Molecular Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-1639-5735
2017 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 3, 2747-2757 p.Article in journal (Refereed) Published
Abstract [en]

An understanding of the doping and ion distributions in light-emitting electrochemical cells (LECs) is required to approach a realistic conduction model which can precisely explain the electrochemical reactions, p-n junction formation, and ion dynamics in the active layer and to provide relevant information about LECs for systematic improvement of function and manufacture. Here, Fourier-transform infrared (FTIR) microscopy is used to monitor anion density profile and polymer structure in situ and for time-resolved mapping of electrochemical doping in an LEC under bias. The results are in very good agreement with the electrochemical doping model with respect to ion redistribution and formation of a dynamic p-n junction in the active layer. We also physically slow ions by decreasing the working temperature and study frozen-junction formation and immobilization of ions in a fixed-junction LEC device by FTIR imaging. The obtained results show irreversibility of the ion redistribution and polymer doping in a fixed-junction device. In addition, we demonstrate that infrared microscopy is a useful tool for in situ characterization of electroactive organic materials.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2017. Vol. 9, no 3, 2747-2757 p.
Keyword [en]
light-emitting electrochemical cell; FTIR spectroscopic imaging electrochemical doping doping profile; ion distribution; dynamic p-n junction; infrared microspectroscopy; principal component analysis
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-135398DOI: 10.1021/acsami.6b14162ISI: 000392909500086PubMedID: 28032741OAI: oai:DiVA.org:liu-135398DiVA: diva2:1081514
Note

Funding Agencies|Power Papers project from the Knut and Alice Wallenberg Foundation [2011-0050]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [SFO-Mat-LiU 2009-00971]

Available from: 2017-03-14 Created: 2017-03-14 Last updated: 2017-04-05

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The full text will be freely available from 2017-12-29 16:29
Available from 2017-12-29 16:29

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