Cd-free Cu-doped ZnInS/ZnS Core/Shell nanocrystals: Controlled synthesis and photophysical properties

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.authorKaur, Manpreet
buir.contributor.authorSharma, Ashma
buir.contributor.authorOlutaş, Murat
buir.contributor.authorErdem, Onur
buir.contributor.authorSharma, Manoj
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.volumeNumber13en_US
dc.contributor.authorKaur, Manpreeten_US
dc.contributor.authorSharma, Ashmaen_US
dc.contributor.authorOlutaş, Muraten_US
dc.contributor.authorErdem, Onuren_US
dc.contributor.authorKumar, A.en_US
dc.contributor.authorSharma, Manojen_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2019-02-21T16:07:19Z
dc.date.available2019-02-21T16:07:19Z
dc.date.issued2018en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractHere, we report efficient composition-tunable Cu-doped ZnInS/ZnS (core and core/shell) colloidal nanocrystals (CNCs) synthesized by using a colloidal non-injection method. The initial precursors for the synthesis were used in oleate form rather than in powder form, resulting in a nearly defect-free photoluminescence (PL) emission. The change in Zn/In ratio tunes the percentage incorporation of Cu in CNCs. These highly monodisperse Cu-doped ZnInS CNCs having variable Zn/In ratios possess peak emission wavelength tunable from 550 to 650 nm in the visible spectrum. The quantum yield (QY) of these synthesized Cd-free CNCs increases from 6.0 to 65.0% after coating with a ZnS shell. The CNCs possessing emission from a mixed contribution of deep trap and dopant states to only dominant dopant-related Stokes-shifted emission are realized by a careful control of stoichiometric ratio of different reactant precursors during synthesis. The origin of this shift in emission was understood by using steady state and time-resolved fluorescence (TRF) spectroscopy studies. As a proof-of-concept demonstration, these blue excitable Cu-doped ZnInS/ZnS CNCs have been integrated with commercial blue LEDs to generate white-light emission (WLE). The suitable combination of these highly efficient doped CNCs results led to a Commission Internationale de l’Enclairage (CIE) color coordinates of (0.33, 0.31) at a color coordinate temperature (CCT) of 3694 K, with a luminous efficacy of optical radiation (LER) of 170 lm/Wopt and a color rendering index (CRI) of 88.en_US
dc.description.provenanceMade available in DSpace on 2019-02-21T16:07:19Z (GMT). No. of bitstreams: 1 Bilkent-research-paper.pdf: 222869 bytes, checksum: 842af2b9bd649e7f548593affdbafbb3 (MD5) Previous issue date: 2018en_US
dc.description.sponsorshipM.K. would like to acknowledge the University Grant Commission (UGC), for providing financial support (MANF-SRF). M.S. would like to thank TUBITAK BIDEB 2221 program. H.V.D gratefully acknowledges the TUBA.en_US
dc.identifier.doi10.1186/s11671-018-2599-xen_US
dc.identifier.eissn1556-276Xen_US
dc.identifier.issn1931-7573en_US
dc.identifier.urihttp://hdl.handle.net/11693/50358
dc.language.isoEnglishen_US
dc.publisherSpringerOpenen_US
dc.relation.isversionofhttps://doi.org/10.1186/s11671-018-2599-xen_US
dc.relation.projectUniversity Grants Commission, UGC - University Grants Commission, UGC - BIDEB 2221en_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.source.titleNanoscale Research Lettersen_US
dc.subjectCadmium freeen_US
dc.subjectColloidal quantum dotsen_US
dc.subjectColor propertiesen_US
dc.subjectQuantum yielden_US
dc.subjectCu dopingen_US
dc.subjectWhite-light emissionen_US
dc.subjectColor propertiesen_US
dc.titleCd-free Cu-doped ZnInS/ZnS Core/Shell nanocrystals: Controlled synthesis and photophysical propertiesen_US
dc.typeArticleen_US

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Department of Electrical and Electronics Engineering
Department of Physics
Institute of Materials Science and Nanotechnology (UNAM)