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Femtosecond dynamics of CdTe quantum dots in water

Paper ID Volume ID Publish Year Pages File Format Full-Text
28715 44087 2008 8 PDF Available
Title
Femtosecond dynamics of CdTe quantum dots in water
Abstract

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 ∼40 ps, ∼600 ps and ∼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.

Keywords
Femtosecond; Cadmium telluride; Quantum dots; Fluorescence; Ultrafast dynamics; Electron; Holes; Relaxation; Recombination
First Page Preview
Femtosecond dynamics of CdTe quantum dots in water
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 196, Issue 1, 30 April 2008, Pages 51–58
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering