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Intense and Stable Near-Infrared Emission from Light-Emitting Electrochemical Cells Comprising a Metal-Free Indacenodithieno[3,2-b]thiophene-Based Copolymer as the Single Emitter
Umeå University, Faculty of Science and Technology, Department of Physics. LunaLEC AB, Tvistevagen 47, SE-90719 Umea, Sweden.
Umeå University, Faculty of Science and Technology, Department of Physics. LunaLEC AB, Tvistevagen 47, SE-90719 Umea, Sweden.
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2017 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 29, no 18, p. 7750-7759Article in journal (Refereed) Published
Abstract [en]

We report on the synthesis, characterization, and application of a series of metal-free near-infrared (NIR) emitting alternating donor/acceptor copolymers based on indacenodithieno[3,2-b]thiophene (IDTT) as the donor unit. A light-emitting electrochemical cell (LEC), comprising a blend of the copolymer poly[indacenodithieno[3,2-b]thiophene-2,8-diyl-alt-2,3-diphenyl-5,8-di(thiophen-2-y1)- quinoxaline-5,5'-diy1] and an ionic liquid as the single-layer active material sandwiched between two air-stable electrodes, delivered NIR emission (lambda(peak) = 705 nm) with a high radiance of 129 mu W/cm(2) when driven by a low voltage of 3.4 V. The NIR-LEC also featured good stress stability, as manifested in that the peak NIR output from a nonencapsulated device after 24 h of continuous operation only had dropped by 3% under N-2 atmosphere and by 27% under ambient air. This work accordingly introduces IDTT-based donor/acceptor copolymers as functional metal-free electroluminescent materials in NIR-emitting devices and also provides guidelines for how future NIR emitters should be designed for further improved performance.

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AMER CHEMICAL SOC , 2017. Vol. 29, no 18, p. 7750-7759
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URN: urn:nbn:se:umu:diva-140905DOI: 10.1021/acs.chemmater.7b02049ISI: 000411918900016OAI: oai:DiVA.org:umu-140905DiVA, id: diva2:1157769
Available from: 2017-11-16 Created: 2017-11-16 Last updated: 2018-06-09Bibliographically approved

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Tang, ShiLarsen, ChristianEdman, Ludvig

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