Morphology-dependent energy transfer of polyfluorene nanoparticles decorating InGaN/GaN quantum-well nanopillars

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage18619en_US
dc.citation.issueNumber36en_US
dc.citation.spage18613en_US
dc.citation.volumeNumber117en_US
dc.contributor.authorErdem, T.en_US
dc.contributor.authorIbrahimova, V.en_US
dc.contributor.authorJeon, D. W.en_US
dc.contributor.authorLee, I. H.en_US
dc.contributor.authorTuncel, D.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2015-07-28T11:59:04Z
dc.date.available2015-07-28T11:59:04Z
dc.date.issued2013en_US
dc.departmentDepartment of Physicsen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentDepartment of Chemistryen_US
dc.description.abstractConjugated polymer nanoparticles (CPNs), prepared in aqueous dispersion from poly[(9,9-bis{3- bromopropyl}fluorenyl-2,7-diyl)-co-(1,4-benzo-{2,1,3}-thiodiazole)] (PFBT-Br), are incorporated into a nanopillar architecture of InGaN/GaN multiple quantum wells (MQWs) to demonstrate a new organic/inorganic class of nanostructured excitonic model system. This hybrid system enables intimate integration for strong exciton−exciton interactions through nonradiative energy transfer (NRET) between the integrated CPNs and MQW pillars. The NRET of these excitonic systems is systematically investigated at varied temperatures. In these hybrids, InGaN/GaN MQWs serve as the donor of the NRET pair, while immobilized PFBT-Br polymer serves as the acceptor. To understand morphology-dependent NRET, PFBT-Br CPNs coating InGaN/GaN MQWs are made to defold into polymer chains by in situ treatment with a good solvent (THF). The experimental results indicate that NRET is significantly stronger in the case of CPNs compared with their defolded polymer chains. At room temperature, while the NRET efficiency of open polymer chains−nanopillar system is only 10%, PFBT-Br CPNs exhibit a substantially higher NRET efficiency of 33% (preserving the total number of polymer molecules). The NRET efficiency of the nanoparticle systems is observed to be 25% at 250 K, 22% at 200 K, 19% at 150 K, and 15% at 100 K. On the other hand, the defolded polymer chains exhibit significantly lower NRET efficiencies of 17% at 250 K, 16% at 200 K, 11% at 150 K, and 5% at 100 K. This work may potentially open up new opportunities for the hybrid organic/inorganic systems where strong excitonic interactions are desired for light generation, light harvesting, and sensing applications.en_US
dc.identifier.doi10.1021/jp404354sen_US
dc.identifier.issn1932-7447
dc.identifier.urihttp://hdl.handle.net/11693/11853
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/jp404354sen_US
dc.source.titleJournal of Physical Chemistry Cen_US
dc.titleMorphology-dependent energy transfer of polyfluorene nanoparticles decorating InGaN/GaN quantum-well nanopillarsen_US
dc.typeArticleen_US

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