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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, time-resolved experiments performed at 10 K evidenced a size-dependent, 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 …
American Chemical Society
Publication date: 
22 Sep 2011

Giovanni Morello, Angela Fiore, Rosanna Mastria, Andrea Falqui, Alessandro Genovese, Arianna Creti, Mauro Lomascolo, isabella raffaella franchini, Liberato Manna, Fabio Della Sala, Roberto Cingolani, Milena De Giorgi

Biblio References: 
The Journal of Physical Chemistry C