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The Weak Microcavity as an Enabler for Bright and Fault-tolerant Light-emitting Electrochemical Cells
Umeå Univ, Dept Phys, Organ Photon & Elect Grp, Umeå, Sweden.
Umeå Univ, Dept Phys, Organ Photon & Elect Grp, Umeå, Sweden.
Umeå Univ, Dept Phys, Organ Photon & Elect Grp, Umeå, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry. Umeå Univ, Dept Phys, Organ Photon & Elect Grp, Umeå, 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
2018. Vol. 8, article id 6970
National Category
Atom and Molecular Physics and Optics Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-356397DOI: 10.1038/s41598-018-25287-xISI: 000431291500022PubMedID: 29725061OAI: oai:DiVA.org:uu-356397DiVA, id: diva2:1235430
Funder
Swedish Research CouncilSwedish Energy AgencyThe Kempe FoundationsSwedish Foundation for Strategic Research
Note

Correction in: Scientific Reports, vol. 8, article number: 8697.

DOI: 10.1038/s41598-018-26760-3

Available from: 2018-07-25 Created: 2018-07-25 Last updated: 2018-10-16Bibliographically approved

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