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Incorporation of Designed Donor-Acceptor-Donor Segments in a Host Polymer for Strong Near-Infrared Emission from a Large-Area Light-Emitting Electrochemical Cell
Umeå University, Faculty of Science and Technology, Department of Physics. LunaLEC AB, Umeå University, SE-90187 Umeå, Sweden.ORCID iD: 0000-0003-1274-5918
Umeå University, Faculty of Science and Technology, Department of Physics. LunaLEC AB, Umeå University, SE-90187 Umeå, Sweden.ORCID iD: 0000-0002-2480-3786
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2018 (English)In: ACS Applied Energy Materials, ISSN 2574-0962, Vol. 1, no 4, p. 1753-1761Article in journal (Refereed) Published
Abstract [en]

Cost-efficient thin-film devices that emit in the near-infrared (NIR) range promise a wide range of important applications. Here, the synthesis and NIR application of a series of copolymers comprising poly[indacenodithieno[3,2-b]thiophene-2,8-diyl] (PIDTT) as the host and different donor–acceptor–donor (DAD) segments as the guest are reported. We find that a key design criterion for efficient solid-state host-to-guest energy transfer is that the DAD conformation is compatible with the conformation of the host. Such host–guest copolymers are evaluated as the emitter in light-emitting electrochemical cells (LECs) and organic light-emitting diodes, and the best performance is invariably attained from the LEC devices because of the observed balanced electrochemical doping that alleviates issues with a noncentered emission zone. An LEC device comprising a host–guest copolymer with 4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-b′]dithiophene as the donor and benzo[c][1,2,5]thiadiazole as the acceptor delivers an impressive near-infrared (NIR) performance in the form of a high radiance of 1458 μW/cm2 at a peak wavelength of 725 nm when driven by a current density of 500 mA/cm2, a second-fast turn-on, and a good stress stability as manifested in a constant radiance output during 3 days of uninterrupted operation. The high-molecular-weight copolymer features excellent processability, and the potential for low-cost and scalable NIR applications is verified through a spray-coating fabrication of a >40 cm2 large-area device, which emits intense and uniform NIR light at a low drive voltage of 4.5 V.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 1, no 4, p. 1753-1761
Keywords [en]
near-infrared, NIR, large-area device, light-emitting electrochemical cell, LEC, copolymer, solution processing
Identifiers
URN: urn:nbn:se:umu:diva-157352DOI: 10.1021/acsaem.8b00283ISI: 000458705400044OAI: oai:DiVA.org:umu-157352DiVA, id: diva2:1296471
Funder
Swedish Foundation for Strategic Research Swedish Research CouncilSwedish Energy AgencySwedish Research Council FormasAvailable from: 2019-03-15 Created: 2019-03-15 Last updated: 2019-03-15Bibliographically approved

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Tang, ShiLarsen, ChristianEdman, Ludvig

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