EXCITON ENGINEERING THROUGH TUNALBLE FLUORESCENT QUANTUM DEFECTS

dc.contributor.advisorWang, YuHuangen_US
dc.contributor.authorKwon, Hyejinen_US
dc.contributor.departmentChemistryen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2016-06-22T05:52:59Z
dc.date.available2016-06-22T05:52:59Z
dc.date.issued2016en_US
dc.description.abstractThis thesis demonstrates exciton engineering in semiconducting single-walled carbon nanotubes through tunable fluorescent quantum defects. By introducing different functional moieties on the sp2 lattice of carbon nanotubes, the nanotube photoluminescence is systematically tuned over 68 meV in the second near-infrared window. This new class of quantum emitters is enabled by a new chemistry that allows covalent attachment of alkyl/aryl functional groups from their iodide precursors in aqueous solution. Using aminoaryl quantum defects, we show that the pH and temperature of complex fluids can be optically measured through defect photoluminescence that encodes the local environment information. Furthermore, defect-bound trions, which are electron-hole-electron tri-carrier quasi-particles, are observed in alkylated single-walled carbon nanotubes at room temperature with surprisingly high photoluminescence brightness. Collectively, the emission from defect-bound excitons and trions in (6,5)-single walled carbon nanotubes is 18-fold brighter than that of the native exciton. These findings pave the way to chemical tailoring of the electronic and optical properties of carbon nanostructures with fluorescent quantum defects and may find applications in optoelectronics and bioimaging.en_US
dc.identifierhttps://doi.org/10.13016/M2049F
dc.identifier.urihttp://hdl.handle.net/1903/18253
dc.language.isoenen_US
dc.subject.pqcontrolledChemistryen_US
dc.subject.pquncontrolledCarbon Nanotubesen_US
dc.subject.pquncontrolledDefecten_US
dc.subject.pquncontrolledExcitonen_US
dc.subject.pquncontrolledPhotoluminescenceen_US
dc.subject.pquncontrolledSemiconductoren_US
dc.subject.pquncontrolledTrionen_US
dc.titleEXCITON ENGINEERING THROUGH TUNALBLE FLUORESCENT QUANTUM DEFECTSen_US
dc.typeDissertationen_US

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