White Light from a Light-Emitting Electrochemical Cell: Controlling the Energy-Transfer in a Conjugated Polymer/Triplet-Emitter Blend
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
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.
white luminance, light-emitting electrochemical cell, solid-state lighting, conjugated polymer, triplet ission, energy transfer
IdentifiersURN: urn:nbn:se:umu:diva-113733DOI: 10.1021/acsami.5b09119ISI: 000366005600050PubMedID: 26536909OAI: oai:DiVA.org:umu-113733DiVA: diva2:890011