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White light-emitting electrochemical cell
Umeå University, Faculty of Science and Technology, Department of Physics. (The Organic Photonics and Electronics Group)
Merck KGaA.
Merck KGgA.
Umeå University, Faculty of Science and Technology, Department of Physics. (The Organic Photonics and Electronics Group)
2011 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 3, no 9, 3384-3388 p.Article in journal (Refereed) Published
Abstract [en]

We report a light-emitting electrochemical cell (LEC) with air-stable electrodes and a solution-processed single-layer active material that emits warm-white light (CIE coordinates = (0.39, 0.43); color rendering index =83) with significant brightness (B) at a low voltage. The carefully tuned trichromatic device exhibits a short turn-on time (5 s to B > 100 cd/m2), high efficiency (3.1 cd/A at B = 240 cd/m2) and good operational stability (17 h at B > 100 cd/m2). We also report a blue LEC with a highly respectable set of device properties in the form of a turn-on time of 5 s, an efficiency of 3.6 lm/W and 5.6 cd/A, and an uninterrupted operational lifetime of 25 h. Finally, by analyzing data from trichromatic and monochromatic devices as well as from the constituent fluorescent CPs, we are able to point out a viable path toward further improvements in the performance of the white-emitting LEC.

Place, publisher, year, edition, pages
American Chemical Society , 2011. Vol. 3, no 9, 3384-3388 p.
Keyword [en]
light-emitting electrochemical cell, white luminescence, solid-state lighting, conjugated polymer, solution-processed technology
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:umu:diva-48546DOI: 10.1021/am200559bOAI: oai:DiVA.org:umu-48546DiVA: diva2:450799
Available from: 2011-10-21 Created: 2011-10-21 Last updated: 2017-12-08Bibliographically approved

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Tang, ShiEdman, Ludvig

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