Show simple item record

dc.contributor.author
le Feber, Boris
dc.contributor.author
Prins, Ferry
dc.contributor.author
De Leo, Eva
dc.contributor.author
Rabouw, Freddy T.
dc.contributor.author
Norris, David J.
dc.date.accessioned
2022-08-02T08:39:36Z
dc.date.available
2018-03-15T01:56:51Z
dc.date.available
2018-03-23T10:18:26Z
dc.date.available
2018-03-23T17:56:40Z
dc.date.available
2018-02-27T03:39:00Z
dc.date.available
2018-03-23T10:15:32Z
dc.date.available
2022-08-02T08:39:36Z
dc.date.issued
2018-02-14
dc.identifier.issn
1530-6984
dc.identifier.issn
1530-6992
dc.identifier.other
10.1021/acs.nanolett.7b04495
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/252781
dc.identifier.doi
10.3929/ethz-b-000252781
dc.description.abstract
To improve the photophysical performance of colloidal quantum dots for laser applications, sophisticated core/shell geometries have been developed. Typically, a wider bandgap semiconductor is added as a shell to enhance the gain from the quantum-dot core. This shell is designed to electronically isolate the core, funnel excitons to it, and reduce nonradiative Auger recombination. However, the shell could also potentially provide a secondary source of gain, leading to further versatility in these materials. Here we develop high-quality quantum-dot ring lasers that not only exhibit lasing from both the core and the shell but also the ability to switch between them. We fabricate ring resonators (with quality factors up to ∼2500) consisting only of CdSe/CdS/ZnS core/shell/shell quantum dots using a simple template-stripping process. We then examine lasing as a function of the optical excitation power and ring radius. In resonators with quality factors >1000, excitons in the CdSe cores lead to red lasing with thresholds at ∼25 μJ/cm2. With increasing power, green lasing from the CdS shell emerges (>100 μJ/cm2) and then the red lasing begins to disappear (>250 μJ/cm2). We present a rate-equation model that can explain this color switching as a competition between exciton localization into the core and stimulated emission from excitons in the shell. Moreover, by lowering the quality factor of the cavity we can engineer the device to exhibit only green lasing. The mechanism demonstrated here provides a potential route toward color-switchable quantum-dot lasers.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
American Chemical Society
en_US
dc.rights.uri
http://rightsstatements.org/page/InC-NC/1.0/
dc.subject
Quantum-dot lasers
en_US
dc.subject
core/shell nanocrystals
en_US
dc.subject
giant-shell nanocrystals
en_US
dc.subject
colloidal quantum dots
en_US
dc.subject
template stripping
en_US
dc.subject
ultrafast switching
en_US
dc.title
Colloidal-Quantum-Dot Ring Lasers with Active Color Control
en_US
dc.type
Journal Article
dc.rights.license
In Copyright - Non-Commercial Use Permitted
dc.date.published
2017-12-28
ethz.journal.title
Nano Letters
ethz.journal.volume
18
en_US
ethz.journal.issue
2
en_US
ethz.journal.abbreviated
Nano Lett
ethz.pages.start
1028
en_US
ethz.pages.end
1034
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Quantum-Dot Plasmonics and Spasers
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02130 - Dep. Maschinenbau und Verfahrenstechnik / Dep. of Mechanical and Process Eng.::02668 - Inst. f. Energie- und Verfahrenstechnik / Inst. Energy and Process Engineering::03875 - Norris, David J. / Norris, David J.
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02130 - Dep. Maschinenbau und Verfahrenstechnik / Dep. of Mechanical and Process Eng.::02668 - Inst. f. Energie- und Verfahrenstechnik / Inst. Energy and Process Engineering::03875 - Norris, David J. / Norris, David J.
ethz.grant.agreementno
339905
ethz.grant.fundername
EC
ethz.grant.funderDoi
10.13039/501100000780
ethz.grant.program
FP7
ethz.date.deposited
2018-03-15T01:57:30Z
ethz.source
WOS
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2018-03-26T06:14:33Z
ethz.rosetta.lastUpdated
2021-02-14T23:00:55Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
dc.identifier.olduri
http://hdl.handle.net/20.500.11850/249946
dc.identifier.olduri
http://hdl.handle.net/20.500.11850/244491
ethz.COinS
ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.atitle=Colloidal-Quantum-Dot%20Ring%20Lasers%20with%20Active%20Color%20Control&rft.jtitle=Nano%20Letters&rft.date=2018-02-14&rft.volume=18&rft.issue=2&rft.spage=1028&rft.epage=1034&rft.issn=1530-6984&1530-6992&rft.au=le%20Feber,%20Boris&Prins,%20Ferry&De%20Leo,%20Eva&Rabouw,%20Freddy%20T.&Norris,%20David%20J.&rft.genre=article&rft_id=info:doi/10.1021/acs.nanolett.7b04495&
 Search print copy at ETH Library

Files in this item

Thumbnail

Publication type

Show simple item record