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

被引：44

作者：

Morello, Giovanni ^{[1
]}

Anni, Marco ^{[1
]}

Cozzoli, Pantaleo Davide ^{[1
]}

Manna, Liberato ^{[1
]}

Cingolani, Roberto ^{[1
]}

De Giorgi, Milena ^{[1
]}

机构：

[1] Univ Lecce, NNL, CNR, INFM,Distretto Tecnol ISUFI, I-73100 Lecce, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2007年 / 111卷 / 28期

关键词：

D O I：

10.1021/jp072783h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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)).

引用

页码：10541 / 10545

页数：5

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