Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/8801

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dc.contributor.authorSantos, João R.-
dc.contributor.authorVasilevskiy, Mikhail-
dc.contributor.authorFilonovich, Sergej-
dc.date.accessioned2009-03-17T16:10:31Z-
dc.date.available2009-03-17T16:10:31Z-
dc.date.issued2008-12-22-
dc.identifier.citation"Physical review B: Condensed matter and materials physics." ISSN 1098-012. 78:24 (Dec. 2008) 245422en
dc.identifier.issn1098-0121en
dc.identifier.urihttp://hdl.handle.net/1822/8801-
dc.description.abstractWe present a theoretical model and Monte Carlo simulation results that naturally explain all the features of the thermally activated photoluminescence upconversion effect also known as anti-Stokes photoluminescence ASPL observed in ensembles of colloidal semiconductor nanocrystal quantum dots QDs . The proposed ASPL mechanism includes the following principal ingredients: i optical-phonon-assisted absorption of an incident photon in a relatively large dot in the ensemble, ii emission of a higher-energy photon from the zero-phonon exciton-polaron state, with an upconversion equal to one optical-phonon energy, and iii cascade reabsorption and re-emission processes involving QDs of successively smaller sizes within the sample, rendering the experimentally observed large anti-Stokes shift of the energy of the photon that finally leaves the sample. The results obtained by the Monte Carlo modeling based on the proposed mechanism reproduce all the experimentally observed ASPL trends in colloidal QD solutions.en
dc.description.sponsorshipFundação para a Ciência e a Tecnologia (FCT)por
dc.language.isoengen
dc.publisherAmerican Physical Societyen
dc.rightsopenAccessen
dc.subjectcolloidspor
dc.subjectMonte Carlo methodspor
dc.subjectphonon-exciton interactionspor
dc.subjectphononspor
dc.subjectphotoluminescencepor
dc.subjectpolaronspor
dc.subjectsemiconductor quantum dotspor
dc.subjectthermoluminescencepor
dc.titleCascade up-conversion of photoluminescence in quantum dot ensemblesen
dc.typearticlepor
dc.peerreviewedyespor
sdum.number24en
sdum.pagination245422en
sdum.publicationstatuspublisheden
sdum.volume78en
oaire.citationIssue24por
oaire.citationVolume78por
dc.identifier.essn1550-235X-
dc.identifier.doi10.1103/PhysRevB.78.245422por
dc.subject.wosScience & Technologypor
sdum.journalPhysical Review B: Condensed Matter and Materials Physicspor
Appears in Collections:CDF - CEP - Artigos/Papers (with refereeing)
CDF - FMNC - Artigos/Papers (with refereeing)

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