Giant alloyed hot injection shells enable ultralow optical gain threshold in colloidal quantum wells
buir.contributor.author | Altıntaş, Yemliha | |
buir.contributor.author | Güngör, Kıvanç | |
buir.contributor.author | Sak, Mustafa | |
buir.contributor.author | Quliyeva, Ulviyya | |
buir.contributor.author | Mutlugün, Evren | |
buir.contributor.author | Demir, Hilmi Volkan | |
buir.contributor.orcid | Demir, Hilmi Volkan|0000-0003-1793-112X | |
dc.citation.epage | 10670 | en_US |
dc.citation.issueNumber | 9 | en_US |
dc.citation.spage | 10662 | en_US |
dc.citation.volumeNumber | 13 | en_US |
dc.contributor.author | Altıntaş, Yemliha | en_US |
dc.contributor.author | Güngör, Kıvanç | en_US |
dc.contributor.author | Gao, Y. | en_US |
dc.contributor.author | Sak, Mustafa | en_US |
dc.contributor.author | Quliyeva, Ulviyya | en_US |
dc.contributor.author | Bappi, G. | en_US |
dc.contributor.author | Mutlugün, Evren | en_US |
dc.contributor.author | Sargent, E. H. | en_US |
dc.contributor.author | Demir, Hilmi Volkan | en_US |
dc.date.accessioned | 2020-02-12T06:27:40Z | |
dc.date.available | 2020-02-12T06:27:40Z | |
dc.date.issued | 2019 | |
dc.department | Department of Electrical and Electronics Engineering | en_US |
dc.department | Department of Physics | en_US |
dc.department | Institute of Materials Science and Nanotechnology (UNAM) | en_US |
dc.description.abstract | As 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.description.provenance | Submitted by Zeynep Aykut (zeynepay@bilkent.edu.tr) on 2020-02-12T06:27:40Z No. of bitstreams: 1 Giant_alloyed_hot_injection_shells_enable_ultralow_optical_gain_threshold_in_colloidal_quantum_wells.pdf: 4611569 bytes, checksum: 266ed6a23465f9a876e324b21bd703c2 (MD5) | en |
dc.description.provenance | Made available in DSpace on 2020-02-12T06:27:40Z (GMT). No. of bitstreams: 1 Giant_alloyed_hot_injection_shells_enable_ultralow_optical_gain_threshold_in_colloidal_quantum_wells.pdf: 4611569 bytes, checksum: 266ed6a23465f9a876e324b21bd703c2 (MD5) Previous issue date: 2019 | en |
dc.identifier.doi | 10.1021/acsnano.9b04967 | en_US |
dc.identifier.issn | 1936-0851 | |
dc.identifier.uri | http://hdl.handle.net/11693/53294 | |
dc.language.iso | English | en_US |
dc.publisher | American Chemical Society | en_US |
dc.relation.isversionof | https://dx.doi.org/10.1021/acsnano.9b04967 | en_US |
dc.source.title | ACS Nano | en_US |
dc.subject | Auger recombination | en_US |
dc.subject | Quantum mechanics | en_US |
dc.subject | Cadmium selenide | en_US |
dc.subject | Lasers | en_US |
dc.subject | Stability | en_US |
dc.title | Giant alloyed hot injection shells enable ultralow optical gain threshold in colloidal quantum wells | en_US |
dc.type | Article | en_US |
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