Giant alloyed hot injection shells enable ultralow optical gain threshold in colloidal quantum wells

buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112Xen_US
dc.citation.epage10670en_US
dc.citation.issueNumber9en_US
dc.citation.spage10662en_US
dc.citation.volumeNumber13en_US
dc.contributor.authorAltıntaş, Yemlihaen_US
dc.contributor.authorGüngör, Kıvançen_US
dc.contributor.authorGao, Y.en_US
dc.contributor.authorSak, Mustafaen_US
dc.contributor.authorQuliyeva, Ulviyyaen_US
dc.contributor.authorBappi, G.en_US
dc.contributor.authorMutlugün, Evrenen_US
dc.contributor.authorSargent, E. H.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.contributor.bilkentauthorAltıntaş, Yemliha
dc.contributor.bilkentauthorGüngör, Kıvanç
dc.contributor.bilkentauthorSak, Mustafa
dc.contributor.bilkentauthorQuliyeva, Ulviyya
dc.contributor.bilkentauthorMutlugün, Evren
dc.contributor.bilkentauthorDemir, Hilmi Volkan
dc.date.accessioned2020-02-12T06:27:40Z
dc.date.available2020-02-12T06:27:40Z
dc.date.issued2019
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.abstractAs an attractive materials system for high-performance optoelectronics, colloidal nanoplatelets (NPLs) benefit from atomic-level precision in thickness, minimizing emission inhomogeneous broadening. Much progress has been made to enhance their photoluminescence quantum yield (PLQY) and photostability. However, to date, layer-by-layer growth of shells at room temperature has resulted in defects that limit PLQY and thus curtail the performance of NPLs as an optical gain medium. Here, we introduce a hot-injection method growing giant alloyed shells using an approach that reduces core/shell lattice mismatch and suppresses Auger recombination. Near-unity PLQY is achieved with a narrow full-width-at-half-maximum (20 nm), accompanied by emission tunability (from 610 to 650 nm). The biexciton lifetime exceeds 1 ns, an order of magnitude longer than in conventional colloidal quantum dots (CQDs). Reduced Auger recombination enables record-low amplified spontaneous emission threshold of 2.4 μJ cm–2under one-photon pumping. This is lower by a factor of 2.5 than the best previously reported value in nanocrystals (6 μJ cm–2 for CdSe/CdS NPLs). Here, we also report single-mode lasing operation with a 0.55 mJ cm–2 threshold under two-photoexcitation, which is also the best among nanocrystals (compared to 0.76 mJ cm–2 from CdSe/CdS CQDs in the Fabry–Pérot cavity). These findings indicate that hot-injection growth of thick alloyed shells makes ultrahigh performance NPLs.en_US
dc.identifier.doi10.1021/acsnano.9b04967en_US
dc.identifier.issn1936-0851
dc.identifier.urihttp://hdl.handle.net/11693/53294
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttps://dx.doi.org/10.1021/acsnano.9b04967en_US
dc.source.titleACS Nanoen_US
dc.subjectAuger recombinationen_US
dc.subjectQuantum mechanicsen_US
dc.subjectCadmium selenideen_US
dc.subjectLasersen_US
dc.subjectStabilityen_US
dc.titleGiant alloyed hot injection shells enable ultralow optical gain threshold in colloidal quantum wellsen_US
dc.typeArticleen_US
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