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Efficient Biexciton Emission in Elongated CdSe/ZnS Nanocrystals

hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
hal.structure.identifierlp2n-01,lp2n-12
dc.contributor.authorLOUYER, Yann
dc.contributor.authorBIADALA, Louis
hal.structure.identifierlp2n-01,lp2n-12
dc.contributor.authorTREBBIA, Jean-Baptiste
hal.structure.identifierlp2n-01,lp2n-12
dc.contributor.authorFERNÉE, Mark J.
hal.structure.identifierlp2n-01,lp2n-12
dc.contributor.authorTAMARAT, Philippe
hal.structure.identifierlp2n-01,lp2n-12
dc.contributor.authorLOUNIS, Brahim
dc.date.created2011-07-22
dc.date.issued2011-09-14
dc.identifier.issn1530-6984
dc.description.abstractEnWe use a combination of low-temperature magneto-optical and lifetime spectroscopies to study the band-edge exciton fine structure of highly photostable single CdSe/ZnS nanocrystals (NCs). Neutral NCs displaying multiline emission spectra and multiexponential photoluminescence (PL) decays are studied as a function of temperature and external magnetic fields. Three different fine structure regimes are identified as a function of the NC aspect ratio. In particular, we identify an optically inactive ground exciton state, whose oscillator strength is tuned up under magnetic field coupling to bright exciton states, and attribute it to the zero angular momentum ground exciton state of elongated NCs. We also show evidence for highly efficient biexciton emission in these NCs, with radiative yields approaching unity in some cases. We use a combination of low-temperature magneto-optical and lifetime spectroscopies to study the band-edge exciton fine structure of highly photostable single CdSe/ZnS nanocrystals (NCs). Neutral NCs displaying multiline emission spectra and multiexponential photoluminescence (PL) decays are studied as a function of temperature and external magnetic fields. Three different fine structure regimes are identified as a function of the NC aspect ratio. In particular, we identify an optically inactive ground exciton state, whose oscillator strength is tuned up under magnetic field coupling to bright exciton states, and attribute it to the zero angular momentum ground exciton state of elongated NCs. We also show evidence for highly efficient biexciton emission in these NCs, with radiative yields approaching unity in some cases.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.subjectquantum yield
dc.subjectfine structure
dc.subjectbiexciton
dc.subjectexciton
dc.subjectquantum dots
dc.subjectCdSe nanocrystals
dc.title.enEfficient Biexciton Emission in Elongated CdSe/ZnS Nanocrystals
dc.typeArticle de revue
dc.identifier.doi10.1021/nl202506c
dc.subject.halPhysique [physics]/Physique [physics]/Optique [physics.optics]
bordeaux.journalNano Letters
bordeaux.page4370-4375
bordeaux.volume11
bordeaux.issue10
bordeaux.peerReviewedoui
hal.identifierhal-00668360
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00668360v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Nano%20Letters&rft.date=2011-09-14&rft.volume=11&rft.issue=10&rft.spage=4370-4375&rft.epage=4370-4375&rft.eissn=1530-6984&rft.issn=1530-6984&rft.au=LOUYER,%20Yann&BIADALA,%20Louis&TREBBIA,%20Jean-Baptiste&FERN%C3%89E,%20Mark%20J.&TAMARAT,%20Philippe&rft.genre=article


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