Temperature Dependence of Förster Thermalization and Population Decay in PbSe Nanocrystals

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dc.contributor.authorQuintero-Torres, Rafael
dc.contributor.authorvan Veggel, Frank C.J.M.
dc.contributor.authorYoung, Jeff F.
dc.date.accessioned2016-08-26T12:52:42Z
dc.date.available2016-08-26T12:52:42Z
dc.date.copyright2013en_US
dc.date.issued2014-09
dc.description.abstractTime-resolved photoluminescence spectroscopy is used to quantify the Förster-mediated exciton migration rate and the exciton population decay rate in drop-cast solid emulsions of PbSe colloidal nanocrystals emitting near 1.5 μm from 77 to 300 K. For both unimodal and bimodal emulsions, at a fixed temperature in a given sample the measured time constants that characterize the fast transient decay (blue side of the spectrum) and buildup (red side of the spectrum) vary considerably with emission wavelength, but the average fast time constant, ∼25 ns, varies little (i.e., within <25%) with temperature from 77 to 300 K. Over the same temperature range, the exciton population lifetime, ascribed to nonradiative decay, decreases by ∼5 times but is always longer than the Förster time constant. The increase of the Förster-mediated efficacy of exciton redistribution at low temperatures before they decay is therefore almost all due to the variation of the nonradiative decay rate. By analyzing the temporally resolved and steady-state emission spectra, it is noted that the time required for the exciton population to equilibrate is nonexponential and considerably longer (∼150 ns) than the rapid decay and buildup time constants extracted from the decay curves at fixed wavelengths.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipWe gratefully acknowledge the assistance of Charles Foell, Keith Abel and Jothir Mayanantham in preparing the samples, and useful discussions with Russ Algar. The financial assistance of the Natural Sciences and Engineering Research Council of Canada, and the Canadian Institute for Advanced Research is also acknowledged. RQT acknowledges the financial assistance of DGAPA, UNAM.en_US
dc.identifier.citationQuintero-Torres, R., van Veggel, F.C.J.M., & Young, J.F. (2014). Temperature Dependence of Förster Thermalization and Population Decay in PbSe Nanocrystals. Journal of Physical Chemistry C, 118(2), 1377-1385.en_US
dc.identifier.urihttp://dx.doi.org/10.1021/jp4109046
dc.identifier.urihttp://hdl.handle.net/1828/7486
dc.language.isoenen_US
dc.publisherJournal of Physical Chemistry Cen_US
dc.subjectNanocrystals
dc.subjectOptical properties
dc.subjectExciton dynamics
dc.subjectPhotoluminescence of semiconductors
dc.subjectTime resolved spectroscopy
dc.subjectEnergy transfer between semiconductor nanocrystals
dc.subject.departmentDepartment of Chemistry
dc.titleTemperature Dependence of Förster Thermalization and Population Decay in PbSe Nanocrystalsen_US
dc.typePostprinten_US

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