Femtosecond dynamics of CdTe quantum dots in water

被引：27

作者：

Sanz, Mikel ^{[1
]}

Coffea-Duarte, Miguel A. ^{[2
,3
]}

Liz-Marzan, Luis M. ^{[2
,3
]}

Douhal, Abderrazzak ^{[1
]}

机构：

[1] Univ Castilla La Mancha, Dept Quim Fis, Secc Quim, Fac Ciencias Med Ambiente, Toledo 45071, Spain

[2] Univ Vigo, Dept Quim Fis, Vigo 36310, Spain

[3] Univ Vigo, CSIC, Unidad Asociada, Vigo 36310, Spain

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2008年 / 196卷 / 01期

关键词：

femtosecond; cadmium telluride; quantum dots; fluorescence; ultrafast dynamics; electron; holes; relaxation; recombination;

D O I：

10.1016/j.jphotochem.2007.11.012

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：

We present studies on femtosecond to nanosecond fluorescence dynamics of aqueous solutions of cadmium telluride (CdTe) quantum dots (QDS) with diameters of 3.1 and 3.6 nm. Ultrafast times in the range 200-320 fs and 1.6 ps were determined, and assigned to electron relaxation to the bottom of the conduction band and to recombination of trapped electrons and holes. These times are common to the relaxation mechanisms of QDs in solution, and therefore suggests that intrinsic mechanisms for electron and hole relaxation dominate over surface effects, in agreement with other reports. Additionally, times of similar to 40 ps, similar to 600 ps and similar to 20 ns due to radiative transitions were recorded. These results are relevant to understanding the photodynamics of CdTe and other QDs in water which should play a fundamental role in their signal when used in biological media. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：51 / 58

页数：8

共 48 条

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