Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Radiative and nonradiative recombination of photoexcited excitons in multi-shell-coated CdSe/CdS/ZnS quantum dots
KTH, Skolan för bioteknologi (BIO), Teoretisk kemi.ORCID-id: 0000-0002-2442-1809
KTH, Skolan för bioteknologi (BIO), Teoretisk kemi.ORCID-id: 0000-0002-1763-9383
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Cellens fysik.ORCID-id: 0000-0003-0578-4003
Vise andre og tillknytning
2009 (engelsk)Inngår i: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 86, nr 3, s. 37003-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Colloidal quantum dots (QDs) have been widely studied for nanophotonics and bioimaging applications for which the lifetime of their fluorescence is of critical importance. We report experimental and theoretical characterizations of dynamic optical properties of multi-shell-coated CdSe/CdS/ZnS QDs. Quantum-mechanical studies of fundamental optical excitations and Monte Carlo simulations of energy relaxation mechanisms indicate that the excitonic states are densely compacted in the QDs and are easily photoexcited by the laser pulse in the presence of nonradiative electron-phonon interactions. For spherical QDs, the decay time of spontaneous radiative emission of individual photoexcited excitonic states with zero angular momenta is found to be only tens of picoseconds. In our multi-shell QDs, high-energy excitonic states of nonzero angular momenta have to go through a number of nonradiative electron-phonon interaction steps in order to relax to zero-angular-momentum excitonic states for radiative emission, resulting in an effective fluorescence peak at about 2 ns in the photoncount-time relationship. This explains the measured long average fluorescence lifetime of 3.6 ns. Such a long lifetime facilitates the applications of colloidal QDs in areas such as QD-based solar cells, bioimaging and metamaterials.

sted, utgiver, år, opplag, sider
2009. Vol. 86, nr 3, s. 37003-
Emneord [en]
charge-transport, emitting-diodes, in-vivo, lifetime, photoluminescence, semiconductors, silicon, cells
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-18457DOI: 10.1209/0295-5075/86/37003ISI: 000266427700025Scopus ID: 2-s2.0-79051468926OAI: oai:DiVA.org:kth-18457DiVA, id: diva2:336504
Merknad
QC 20100525Tilgjengelig fra: 2010-08-05 Laget: 2010-08-05 Sist oppdatert: 2017-12-12bibliografisk kontrollert

Open Access i DiVA

Fulltekst mangler i DiVA

Andre lenker

Forlagets fulltekstScopus

Personposter BETA

Fu, YingÅgren, HansBrismar, Hjalmar

Søk i DiVA

Av forfatter/redaktør
Fu, YingÅgren, HansKowalewski, JacobBrismar, HjalmarThylén, Lars
Av organisasjonen
I samme tidsskrift
Europhysics letters

Søk utenfor DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 317 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf