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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 universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik. LunaLEC AB, Tvistevagen 47, SE-90719 Umea, Sweden.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik. LunaLEC AB, Tvistevagen 47, SE-90719 Umea, Sweden.
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2017 (Engelska)Ingår i: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 29, nr 18, s. 7750-7759Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
AMER CHEMICAL SOC , 2017. Vol. 29, nr 18, s. 7750-7759
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Annan kemi Den kondenserade materiens fysik
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URN: urn:nbn:se:umu:diva-140905DOI: 10.1021/acs.chemmater.7b02049ISI: 000411918900016Scopus ID: 2-s2.0-85030029591OAI: oai:DiVA.org:umu-140905DiVA, id: diva2:1157769
Tillgänglig från: 2017-11-16 Skapad: 2017-11-16 Senast uppdaterad: 2023-03-23Bibliografiskt granskad

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Tang, ShiLarsen, ChristianEdman, Ludvig

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