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Challenging conventional wisdom: finding high-performance electrodes for light-emitting electrochemical cells
Umeå University, Faculty of Science and Technology, Department of Physics. Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China; School of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, China.
Umeå University, Faculty of Science and Technology, Department of Physics. LunaLEC AB, Linnaeus Vag 24, SE-901 87 Umeå, Sweden.
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-1903-9875
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 39, p. 33380-33389Article in journal (Refereed) Published
Abstract [en]

The light-emitting electrochemical cell (LEC) exhibits capacity for efficient charge injection from two air stable electrodes into a single-layer active material, which is commonly interpreted as implying that the LEC operation is independent of the electrode selection. Here, we demonstrate that this is far from the truth and that the electrode selection instead has a strong influence on the LEC performance. We systematically investigate 13 different materials for the positive anode and negative cathode in a common LEC configuration with the conjugated polymer Super Yellow as the electroactive emitter and find that Ca, Mn, Ag, Al, Cu, indium tin oxide (ITO), and Au function as the LEC cathode, whereas ITO and Ni can operate as the LEC anode. Importantly, we demonstrate that the electrochemical stability of the electrode is paramount and that particularly electrochemical oxidation of the anode can prohibit the functional LEC operation. We finally report that it appears preferable to design the device so that the heights of the injection barriers at the two electrode/active material interfaces are balanced in order to mitigate electrode-induced quenching of the light emission. As such, this study has expanded the set of air-stable electrode materials available for functional LEC operation and also established a procedure for the evaluation and design of future efficient electrode materials.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 10, no 39, p. 33380-33389
Keywords [en]
air-stable electrode, injection barrier, light-emitting electrochemical cell, electrochemical stability, reflectance
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-152982DOI: 10.1021/acsami.8b13036ISI: 000446919800049PubMedID: 30199215OAI: oai:DiVA.org:umu-152982DiVA, id: diva2:1260240
Funder
Swedish Foundation for Strategic Research Swedish Research CouncilSwedish Energy AgencyThe Kempe FoundationsAvailable from: 2018-11-01 Created: 2018-11-01 Last updated: 2018-11-01Bibliographically approved

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Jin, XuSandström, AndreasLindh, E. MattiasTang, ShiEdman, Ludvig

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