Stable and efficient colour enrichment powders of nonpolar nanocrystals in LiCl

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage17616en_US
dc.citation.issueNumber42en_US
dc.citation.spage17611en_US
dc.citation.volumeNumber7en_US
dc.contributor.authorErdem, T.en_US
dc.contributor.authorSoran-Erdem Z.en_US
dc.contributor.authorSharma, V. K.en_US
dc.contributor.authorKeleştemur, Y.en_US
dc.contributor.authorAdam, M.en_US
dc.contributor.authorGaponik N.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2016-02-08T11:00:48Z
dc.date.available2016-02-08T11:00:48Z
dc.date.issued2015en_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.abstractIn this work, we propose and develop the inorganic salt encapsulation of semiconductor nanocrystal (NC) dispersion in a nonpolar phase to make a highly stable and highly efficient colour converting powder for colour enrichment in light-emitting diode backlighting. Here the wrapping of the as-synthesized green-emitting CdSe/CdZnSeS/ZnS nanocrystals into a salt matrix without ligand exchange is uniquely enabled by using a LiCl ionic host dissolved in tetrahydrofuran (THF), which simultaneously disperses these nonpolar nanocrystals. We studied the emission stability of the solid films prepared using NCs with and without LiCl encapsulation on blue LEDs driven at high current levels. The encapsulated NC powder in epoxy preserved 95.5% of the initial emission intensity and stabilized at this level while the emission intensity of NCs without salt encapsulation continuously decreased to 34.7% of its initial value after 96 h of operation. In addition, we investigated the effect of ionic salt encapsulation on the quantum efficiency of nonpolar NCs and found the quantum efficiency of the NCs-in-LiCl to be 75.1% while that of the NCs in dispersion was 73.0% and that in a film without LiCl encapsulation was 67.9%. We believe that such ionic salt encapsulated powders of nonpolar NCs presented here will find ubiquitous use for colour enrichment in display backlighting. © The Royal Society of Chemistry 2015.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T11:00:48Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2015en
dc.identifier.doi10.1039/c5nr02696ben_US
dc.identifier.issn2040-3364
dc.identifier.urihttp://hdl.handle.net/11693/26508
dc.language.isoEnglishen_US
dc.publisherRoyal Society of Chemistryen_US
dc.relation.isversionofhttp://dx.doi.org/10.1039/c5nr02696ben_US
dc.source.titleNanoscaleen_US
dc.subjectColoren_US
dc.subjectDispersionsen_US
dc.subjectEfficiencyen_US
dc.subjectIon exchangeen_US
dc.subjectLight emitting diodesen_US
dc.subjectLightingen_US
dc.subjectNanocrystalline powdersen_US
dc.subjectNanocrystalsen_US
dc.subjectOrganic solventsen_US
dc.subjectPowdersen_US
dc.subjectEmission intensityen_US
dc.subjectEmission stabilityen_US
dc.subjectHighly stablesen_US
dc.subjectInorganic saltsen_US
dc.subjectLigand exchangesen_US
dc.subjectNon - polar phaseen_US
dc.subjectSemiconductor nanocrystalsen_US
dc.subjectTetrahydrofuransen_US
dc.subjectQuantum efficiencyen_US
dc.titleStable and efficient colour enrichment powders of nonpolar nanocrystals in LiClen_US
dc.typeArticleen_US

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