Exciton relaxation processes in colloidal core/shell ZnSe/ZnS nanocrystals

被引：40

作者：

Lomascolo, M

Cretì, A

Leo, G

Vasanelli, L

Manna, L

机构：

[1] IMM CNR, Ist Microelettr & Microsistemi Lecce, I-73100 Lecce, Italy

[2] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[4] Univ Lecce, Inst Adv Interdisciplinary Studies ISUFI, I-73100 Lecce, Italy

[5] Univ Lecce, Dipartimento Ingn Innovaz, I-73100 Lecce, Italy

来源：

APPLIED PHYSICS LETTERS | 2003年 / 82卷 / 03期

关键词：

D O I：

10.1063/1.1537050

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Colloidal ZnSe nanocrystals are coated with a ZnS shell and are investigated by means of time-resolved photoluminescence spectroscopy. These nanocrystals are stable against photooxidation and have photoluminescence quantum efficiencies around 15% even months after the synthesis. Recombination processes are investigated as a function of the excitation intensity and the emission energy. Nonlinear processes such as Auger recombination dominate in the early times after the photogeneration of electron-hole pairs. The lifetime of single exciton states is shorter in smaller ZnSe dots than in larger ones, in accordance with theoretical predictions and as previously observed on similar systems. (C) 2003 American Institute of Physics.

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页码：418 / 420

页数：3

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