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dc.contributor.authorArif, Mohammad, 1974-eng
dc.contributor.authorMukhopadhyay, S.eng
dc.contributor.authorRamasesha, S.eng
dc.contributor.authorGuha, Suchieng
dc.date.issued2009eng
dc.description.abstractThe blue emission of polyfluorene (PF) based light-emitting diodes (LEDs) is known to degrade due to a low energy green emission, which hitherto has been attributed to oxidative defects. By studying the electroluminescence from ethyl-hexyl substituted PF LEDs in the presence of oxygen and in an inert atmosphere, and by using trace quantities of paramagnetic impurities (PM) in the polymer, we show that the triplet states play a major role in the low energy emission mechanism. Our time- dependent many-body studies show that there is a large cross-section for the triplet formation in the electron-hole recombination process in presence of PM, and intersystem crossing from excited singlet to triplet states.eng
dc.description.sponsorshipWe gratefully acknowledge the NSF for support through grant Nos. ECCS-0523656 and 0823563.eng
dc.identifier.citationarXiv:0903.0114v1eng
dc.identifier.urihttp://hdl.handle.net/10355/6797eng
dc.languageEnglisheng
dc.publisherarXiveng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. College of Arts and Sciences. Department of Physics and Astronomy. Physics and Astronomy publicationseng
dc.source.urihttp://arxiv.org/PS_cache/arxiv/pdf/0903/0903.0114v1.pdfeng
dc.subjectsoft condensed mattereng
dc.subjectelectroluminescenceeng
dc.subject.lcshTriplet stateeng
dc.subject.lcshPolymers -- Electric propertieseng
dc.subject.lcshLight emitting diodes -- Materialseng
dc.titleThe role of triplet states in the emission mechanism of polymer light-emitting diodeseng
dc.typeArticleeng


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