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dc.contributor.authorLombeck, Fen
dc.contributor.authorDi, Daweien
dc.contributor.authorYang, Leen
dc.contributor.authorMeraldi, Len
dc.contributor.authorAthanasopoulos, Sen
dc.contributor.authorCredgington, Danielen
dc.contributor.authorSommer, Men
dc.contributor.authorFriend, Richarden
dc.date.accessioned2017-05-04T10:09:30Z
dc.date.available2017-05-04T10:09:30Z
dc.date.issued2016-12-27en
dc.identifier.issn0024-9297
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/264022
dc.description.abstractPoly[N-9′-heptadecanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole) (PCDTBT) is a copolymer composed of alternating thiophene-benzothiadiazole-thiophene (TBT) and carbazole (Cbz) repeat units widely used for stable organic photovoltaics. However, the solubility of PCDTBT is limited, which decreases polymer yield and makes synthesis and purification tedious. Here, we introduce a strategy to increase both solubility and luminescence by the statistical incorporation of additional hexyl side chains at the TBT unit (hex-TBT). An increasing amount of hex-TBT as comonomer from 0 to 100% enhances solubility, leads to backbone torsion, and causes a blue-shift in the absorption and emission spectra. While photovoltaic performance of both PCDTBT:P3HT blends and PCDTBT:PC$_{71}$BM blends decreases with increasing content of hex-TBT due to weaker and blue-shifted absorption, the luminescence properties can be systematically improved. Both photo- and electroluminescence (PL and EL) quantum efficiencies increase with increasing hex-TBT content. We further demonstrate solution-processed red polymer light-emitting diodes based on fully hexylated PCDTBT showing an EL quantum efficiency enhancement of up to 7 times and 2 orders of magnitude enhancement of brightness compared to standard PCDTBT. Fully hexylated PCDTBT shows a peak external quantum efficiency of 1.1% and a peak brightness of 2500 cd/m2
dc.description.sponsorshipFinancial support from the Fonds der Chemischen Industrie (FCI), the Research Innovation Fund of the University of Freiburg and the DFG (SPP1355) is greatly acknowledged. F.L. greatly acknowledges the EPSRC for funding. D.D. acknowledges the Department of Physics (University of Cambridge) and the KACST-Cambridge University Joint Centre of Excellence for support.
dc.languageEnglishen
dc.language.isoenen
dc.publisherAmerican Chemical Society
dc.titlePCDTBT: From Polymer Photovoltaics to Light-Emitting Diodes by Side-Chain-Controlled Luminescenceen
dc.typeArticle
prism.endingPage9387
prism.publicationDate2016en
prism.publicationNameMacromoleculesen
prism.startingPage9382
prism.volume49en
dc.identifier.doi10.17863/CAM.9382
dcterms.dateAccepted2016-11-24en
rioxxterms.versionofrecord10.1021/acs.macromol.6b02216en
rioxxterms.versionAMen
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2016-12-27en
dc.contributor.orcidDi, Dawei [0000-0003-0703-2809]
dc.contributor.orcidCredgington, Daniel [0000-0003-4246-2118]
dc.contributor.orcidFriend, Richard [0000-0001-6565-6308]
dc.identifier.eissn1520-5835
rioxxterms.typeJournal Article/Reviewen
rioxxterms.freetoread.startdate2017-12-07


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