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White Light from a Light-Emitting Electrochemical Cell: Controlling the Energy-Transfer in a Conjugated Polymer/Triplet-Emitter Blend
Umeå University, Faculty of Science and Technology, Department of Physics. LunaLEC AB, Umeå, Sweden. (The Organic Photonics and Electronics Group)
Umeå University, Faculty of Science and Technology, Department of Physics. LunaLEC AB, Umeå, Sweden. (The Organic Photonics and Electronics Group)
2015 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 7, no 46, 25955-25960 p.Article in journal (Refereed) PublishedText
Abstract [en]

We report on the attainment of broadband white light emission from a hostguest light-emitting electrochemical cell, comprising a blue-emitting conjugated polymer as the majority host and a red-emitting small-molecule triplet emitter as the minority guest. An analysis of the energy structure reveals that host-to-guest energy transfer can be effectuated by both Forster and Dexter processes, and through a careful optimization of the active material composition partial energy transfer and white emission is accomplished at a low guest concentration of 0.5%. By adding a small amount of a yellow-emitting conjugated polymer to the active material, white light emission with a high color rendering index of 79, and an efficiency of 4.3 cd/A at significant luminance (>200 cd/m2), is realized.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2015. Vol. 7, no 46, 25955-25960 p.
Keyword [en]
white luminance, light-emitting electrochemical cell, solid-state lighting, conjugated polymer, triplet ission, energy transfer
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-113733DOI: 10.1021/acsami.5b09119ISI: 000366005600050PubMedID: 26536909OAI: oai:DiVA.org:umu-113733DiVA: diva2:890011
Available from: 2015-12-30 Created: 2015-12-28 Last updated: 2015-12-30Bibliographically approved

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Tang, ShiEdman, Ludvig
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