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The Weak Microcavity as an Enabler for Bright and Fault-tolerant Light-emitting Electrochemical Cells
Umea Univ, Dept Phys, Organ Photon & Elect Grp, SE-90187 Umea, Sweden.
Umea Univ, Dept Phys, Organ Photon & Elect Grp, SE-90187 Umea, Sweden.
Umea Univ, Dept Phys, Organ Photon & Elect Grp, SE-90187 Umea, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry. Umea Univ, Dept Phys, Organ Photon & Elect Grp, Umea, Sweden.
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2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 6970Article in journal (Refereed) Published
Abstract [en]

The light-emitting electrochemical cell (LEC) is functional at substantial active-layer thickness, and is as such heralded for being fit for low-cost and fault-tolerant solution-based fabrication. We report here that this statement should be moderated, and that in order to obtain a strong luminous output, it is fundamentally important to fabricate LEC devices with a designed thickness of the active layer. By systematic experimentation and simulation, we demonstrate that weak optical microcavity effects are prominent in a common LEC system, and that the luminance and efficiency, as well as the emission color and the angular intensity, vary in a periodic manner with the active-layer thickness. Importantly, we demonstrate that high-performance light-emission can be attained from LEC devices with a significant active-layer thickness of 300 nm, which implies that low-cost solution-processed LECs are indeed a realistic option, provided that the device structure has been appropriately designed from an optical perspective.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2018. Vol. 8, article id 6970
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Atom and Molecular Physics and Optics
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URN: urn:nbn:se:uu:diva-356397DOI: 10.1038/s41598-018-25287-xISI: 000431291500022PubMedID: 29725061OAI: oai:DiVA.org:uu-356397DiVA, id: diva2:1235430
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Swedish Research CouncilSwedish Energy AgencyAvailable from: 2018-07-25 Created: 2018-07-25 Last updated: 2018-07-25Bibliographically approved

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