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Controlling the emission zone by additives for improved light‐emitting electrochemical cells
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-1256-149x
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-9541-7479
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-2480-3786
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-3481-5163
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2022 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 34, no 8, article id 2107849Article in journal (Refereed) Published
Abstract [en]

The position of the emission zone (EZ) in the active material of a light-emitting electrochemical cell (LEC) has a profound influence on its performance because of microcavity effects and doping- and electrode-induced quenching. Previous attempts of EZ control have focused on the two principal constituents in the active material—the organic semiconductor (OSC) and the mobile ions—but this study demonstrates that it is possible to effectively control the EZ position through the inclusion of an appropriate additive into the active material. More specifically, it is shown that a mere modification of the end group on an added neutral compound, which also functions as an ion transporter, results in a shifted EZ from close to the anode to the center of the active material, which translates into a 60% improvement of the power efficiency. This particular finding is rationalized by a lowering of the effective electron mobility of the OSC through specific additive: OSC interactions, but the more important generic conclusion is that it is possible to control the EZ position, and thereby the LEC performance, by the straightforward inclusion of an easily tuned additive in the active material.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2022. Vol. 34, no 8, article id 2107849
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-201531DOI: 10.1002/adma.202107849ISI: 000742703700001PubMedID: 34891219Scopus ID: 2-s2.0-85122826739OAI: oai:DiVA.org:umu-201531DiVA, id: diva2:1716927
Funder
The Kempe FoundationsSwedish Research CouncilSwedish Energy AgencySwedish Foundation for Strategic ResearchOlle Engkvists stiftelseWenner-Gren FoundationsBertil & Britt Svenssons Stiftelse för BelysningsteknikAvailable from: 2022-12-07 Created: 2022-12-07 Last updated: 2022-12-07Bibliographically approved

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Ràfols-Ribé, JoanZhang, XiaoyingLarsen, ChristianLundberg, PetterLindh, E. MattiasGracia-Espino, EduardoEdman, Ludvig

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Ràfols-Ribé, JoanZhang, XiaoyingLarsen, ChristianLundberg, PetterLindh, E. MattiasMai, Cuc ThuMindemark, JonasGracia-Espino, EduardoEdman, Ludvig
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