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Picosecond photoluminescence decay time in colloidal nanocrystals: The role of intrinsic and surface states (Articolo in rivista)

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Picosecond photoluminescence decay time in colloidal nanocrystals: The role of intrinsic and surface states (Articolo in rivista) (literal)

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Morello, G; Anni, M; Cozzoli, PD; Manna, L; Cingolani, R; De Giorgi, M (2007)
Picosecond photoluminescence decay time in colloidal nanocrystals: The role of intrinsic and surface states
in Journal of physical chemistry. C
(literal)

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Morello, G; Anni, M; Cozzoli, PD; Manna, L; Cingolani, R; De Giorgi, M (literal)

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Univ Lecce, NNL, CNR, INFM,Distretto Tecnol ISUFI, I-73100 Lecce, Italy (literal)

Titolo

Picosecond photoluminescence decay time in colloidal nanocrystals: The role of intrinsic and surface states (literal)

Abstract

Picosecond time-resolved photoluminescence measurements were performed on CdSe core and CdSe/ZnS core/shell colloidal quantum dots (QDs). Photoluminescence (PL) emission is observed to originate from intrinsic +/- 1(U) and +/- 1(L) bright states with lifetimes of 60 and 450 ps, respectively, and from a long living component with nanosecond lifetimes. The latter is attribuited to the emission from surface states (ss) approximately 16 and 13 meV below the +/- 1(L) state for core and core/shell QDs, respectively. We show that in the temperature range between 15 and 70 K the three recombination processes compete and they are thermally populated through different pathways (+/- 1(L) -> +/- 1(U) and ss -> +/- 1(L)). (literal)

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