Temperature and Size Dependence of the Optical Properties of Tetrapod-Shaped Colloidal Nanocrystals Exhibiting Type-II Transitions (Articolo in rivista)

Type
Label
  • Temperature and Size Dependence of the Optical Properties of Tetrapod-Shaped Colloidal Nanocrystals Exhibiting Type-II Transitions (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • Giovanni Morello, Angela Fiore, Rosanna Mastria, Andrea Falqui, Alessandro Genovese, Arianna Cretì,Mauro Lomascolo, Isabella R. Franchini, Liberato Manna, Fabio Della Sala, Roberto Cingolani, and Milena De Giorgi (2011)
    Temperature and Size Dependence of the Optical Properties of Tetrapod-Shaped Colloidal Nanocrystals Exhibiting Type-II Transitions
    in Journal of physical chemistry. C
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Giovanni Morello, Angela Fiore, Rosanna Mastria, Andrea Falqui, Alessandro Genovese, Arianna Cretì,Mauro Lomascolo, Isabella R. Franchini, Liberato Manna, Fabio Della Sala, Roberto Cingolani, and Milena De Giorgi (literal)
Pagina inizio
  • 18094 (literal)
Pagina fine
  • 18104 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 115 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Nanoscience Institute-CNR, Via per Arnesano, 73100 Lecce, Italy Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy IMM CNR, Institute for Microelectronic and Microsystems, I-73100 Lecce, (Italy) Center for Biomolecular Nanotechnologies @UNILE, Istituto Italiano di Tecnologia Via Barsanti, 73010 Arnesano (Lecce), Italy (literal)
Titolo
  • Temperature and Size Dependence of the Optical Properties of Tetrapod-Shaped Colloidal Nanocrystals Exhibiting Type-II Transitions (literal)
Abstract
  • We have investigated the optical properties of colloidal seed-grown CdSe (seed)/CdTe (arms) nanotetrapods both experimentally and computationally. The tetrapods exhibit a type-II transition arising from electrons localized in the CdSe seed region and holes delocalized in the CdTe arms, along with a residual type-I recombination in long-arm tetrapods. Experiments and theory helped to identify the origin of both types of transitions and their size dependence. In particular, timeresolved experiments performed at 10 K evidenced a sizedependent, long living type-II radiative emission arising from the peculiar electron-hole wave function localization. Temperature- dependent photoluminescence (PL) studies indicate that, at high temperature (>150 K), the main process limiting the PL quantum efficiency of the type-I PL is thermal escape of the charge carriers through efficient exciton-optical phonon coupling. The type-II PL instead is limited both by thermal escape and by the promotion of electrons from the conduction band of the seed region to that of the arms, occurring at T > 200 K. (literal)
Prodotto di
Autore CNR

Incoming links:


Prodotto
Autore CNR di
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi
data.CNR.it