Pulsed cathodoluminescence of WS2 nanocrystals at various electron excitation energy densities: Defect induced sub-band gap emission

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dc.contributor.authorBozheyev, Farabi
dc.contributor.authorValiev, Damir
dc.contributor.authorNemkayeva, Renata
dc.contributor.authorAn, Vladimir
dc.contributor.authorTikhonov, Alexander
dc.contributor.authorSugurbekova, Gulnar
dc.creatorFarabi, Bozheyev
dc.date.accessioned2017-12-22T09:10:57Z
dc.date.available2017-12-22T09:10:57Z
dc.date.issued2017-12-01
dc.description.abstractAbstract Pulsed cathodoluminescence spectra and luminescence decay kinetics of WS2 nanocrystals were studied under a high energy electron pulse excitation. Increasing electron energy density inputs to the WS2 nanocrystals lead to enhancement of the electron-hole number and their lifetimes. The maximum luminescence intensity is reached for the highest electron energy dose. The electrons, interacting with WS2 nanocrystals, form defect vacancies, wherein excited electron-holes create bound excitons which further recombine as a distinct sub-band gap emission. The lifetime of bound excitons does not depend on increasing electron doses due to the limitation of the enhancing number of bound excitons by increasing density of defects, which are radiative recombination active centers. The number of bound excitons, i.e. luminescence intensity, is proportional to the density of defects, which can be tuned by electron doses. Micro-photoluminescence measurements of the WS2 monolayer showed formation of excitons and trions.en_US
dc.identifierDOI:10.1016/j.jlumin.2017.09.015
dc.identifier.citationFarabi Bozheyev, Damir Valiev, Renata Nemkayeva, Vladimir An, Alexander Tikhonov, Gulnar Sugurbekova, Pulsed cathodoluminescence of WS2 nanocrystals at various electron excitation energy densities: Defect induced sub-band gap emission, In Journal of Luminescence, Volume 192, 2017, Pages 1308-1312en_US
dc.identifier.issn00222313
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0022231317310864
dc.identifier.urihttp://nur.nu.edu.kz/handle/123456789/3058
dc.language.isoenen_US
dc.publisherJournal of Luminescenceen_US
dc.relation.ispartofJournal of Luminescence
dc.rights.license© 2017 Elsevier B.V. All rights reserved.
dc.subjectTungsten disulfideen_US
dc.subjectNanocrystalen_US
dc.subjectPulsed cathodoluminescenceen_US
dc.subjectElectron energy densityen_US
dc.titlePulsed cathodoluminescence of WS2 nanocrystals at various electron excitation energy densities: Defect induced sub-band gap emissionen_US
dc.typeArticleen_US
elsevier.aggregationtypeJournal
elsevier.coverdate2017-12-01
elsevier.coverdisplaydateDecember 2017
elsevier.endingpage1312
elsevier.identifier.doi10.1016/j.jlumin.2017.09.015
elsevier.identifier.eid1-s2.0-S0022231317310864
elsevier.identifier.piiS0022-2313(17)31086-4
elsevier.identifier.scopusid85029412729
elsevier.openaccess0
elsevier.openaccessarticlefalse
elsevier.openarchivearticlefalse
elsevier.startingpage1308
elsevier.teaserPulsed cathodoluminescence spectra and luminescence decay kinetics of WS2 nanocrystals were studied under a high energy electron pulse excitation. Increasing electron energy density inputs to the WS2...
elsevier.volume192
workflow.import.sourcescience

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