Tuning light emission of PbS nanocrystals from infrared to visible range by cation exchange

Handle URI:
http://hdl.handle.net/10754/582930
Title:
Tuning light emission of PbS nanocrystals from infrared to visible range by cation exchange
Authors:
Binetti, Enrico; Striccoli, Marinella; Sibillano, Teresa; Giannini, Cinzia; Brescia, Rosaria; Falqui, Andrea ( 0000-0002-1476-7742 ) ; Comparelli, Roberto; Corricelli, Michela; Tommasi, Raffaele; Agostiano, Angela; Curri, M Lucia
Abstract:
Colloidal semiconductor nanocrystals, with intense and sharp-line emission between red and near-infrared spectral regions, are of great interest for optoelectronic and bio-imaging applications. The growth of an inorganic passivation layer on nanocrystal surfaces is a common strategy to improve their chemical and optical stability and their photoluminescence quantum yield. In particular, cation exchange is a suitable approach for shell growth at the expense of the nanocrystal core size. Here, the cation exchange process is used to promote the formation of a CdS passivation layer on the surface of very small PbS nanocrystals (2.3 nm in diameter), blue shifting their optical spectra and yielding luminescent and stable nanostructures emitting in the range of 700–850 nm. Structural, morphological and compositional investigation confirms the nanocrystal size contraction after the cation-exchange process, while the PbS rock-salt crystalline phase is retained. Absorption and photoluminescence spectroscopy demonstrate the growth of a passivation layer with a decrease of the PbS core size, as inferred by the blue-shift of the excitonic peaks. The surface passivation strongly increases the photoluminescence intensity and the excited state lifetime. In addition, the nanocrystals reveal increased stability against oxidation over time. Thanks to their absorption and emission spectral range and the slow recombination dynamics, such highly luminescent nano-objects can find interesting applications in sensitized photovoltaic cells and light-emitting devices.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division
Citation:
Tuning light emission of PbS nanocrystals from infrared to visible range by cation exchange 2015, 16 (5):055007 Science and Technology of Advanced Materials
Publisher:
Informa UK Limited
Journal:
Science and Technology of Advanced Materials
Issue Date:
27-Oct-2015
DOI:
10.1088/1468-6996/16/5/055007
Type:
Article
ISSN:
1468-6996; 1878-5514
Additional Links:
http://stacks.iop.org/1468-6996/16/i=5/a=055007?key=crossref.ee45e6868f010570713f6ffefd124c93
Appears in Collections:
Articles; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorBinetti, Enricoen
dc.contributor.authorStriccoli, Marinellaen
dc.contributor.authorSibillano, Teresaen
dc.contributor.authorGiannini, Cinziaen
dc.contributor.authorBrescia, Rosariaen
dc.contributor.authorFalqui, Andreaen
dc.contributor.authorComparelli, Robertoen
dc.contributor.authorCorricelli, Michelaen
dc.contributor.authorTommasi, Raffaeleen
dc.contributor.authorAgostiano, Angelaen
dc.contributor.authorCurri, M Luciaen
dc.date.accessioned2015-11-30T12:52:41Zen
dc.date.available2015-11-30T12:52:41Zen
dc.date.issued2015-10-27en
dc.identifier.citationTuning light emission of PbS nanocrystals from infrared to visible range by cation exchange 2015, 16 (5):055007 Science and Technology of Advanced Materialsen
dc.identifier.issn1468-6996en
dc.identifier.issn1878-5514en
dc.identifier.doi10.1088/1468-6996/16/5/055007en
dc.identifier.urihttp://hdl.handle.net/10754/582930en
dc.description.abstractColloidal semiconductor nanocrystals, with intense and sharp-line emission between red and near-infrared spectral regions, are of great interest for optoelectronic and bio-imaging applications. The growth of an inorganic passivation layer on nanocrystal surfaces is a common strategy to improve their chemical and optical stability and their photoluminescence quantum yield. In particular, cation exchange is a suitable approach for shell growth at the expense of the nanocrystal core size. Here, the cation exchange process is used to promote the formation of a CdS passivation layer on the surface of very small PbS nanocrystals (2.3 nm in diameter), blue shifting their optical spectra and yielding luminescent and stable nanostructures emitting in the range of 700–850 nm. Structural, morphological and compositional investigation confirms the nanocrystal size contraction after the cation-exchange process, while the PbS rock-salt crystalline phase is retained. Absorption and photoluminescence spectroscopy demonstrate the growth of a passivation layer with a decrease of the PbS core size, as inferred by the blue-shift of the excitonic peaks. The surface passivation strongly increases the photoluminescence intensity and the excited state lifetime. In addition, the nanocrystals reveal increased stability against oxidation over time. Thanks to their absorption and emission spectral range and the slow recombination dynamics, such highly luminescent nano-objects can find interesting applications in sensitized photovoltaic cells and light-emitting devices.en
dc.language.isoenen
dc.publisherInforma UK Limiteden
dc.relation.urlhttp://stacks.iop.org/1468-6996/16/i=5/a=055007?key=crossref.ee45e6868f010570713f6ffefd124c93en
dc.rightsContent from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.en
dc.titleTuning light emission of PbS nanocrystals from infrared to visible range by cation exchangeen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.identifier.journalScience and Technology of Advanced Materialsen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionCNR-IPCF Div. Bari, c/o Department of Chemistry, via Orabona 4, 70126 Bari, Italyen
dc.contributor.institutionCNR- IC Institute of Crystallography, National Research Council, Via Amendola 122/O, 70126 Bari, Italyen
dc.contributor.institutionNanochemistry Department, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italyen
dc.contributor.institutionDepartment of Chemistry, University of Bari Aldo Moro, Via Orabona 4, 70126 Bari, Italyen
dc.contributor.institutionDepartment of Basic Medical Sciences, Neuroscience and Sense Organs, University of Bari Aldo Moro, Piazza G. Cesare 11, 70124 Bari, Italyen
dc.contributor.institutionInstitute for Polymers, Composites and Biomaterials, National Research Council, Via Sommarive 14, 38123 Trento, Italyen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorFalqui, Andreaen
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.