Facile synthesis and photoluminescence properties of water-soluble CdTe/CdS core/shell quantum dots

Author

Yuanyuan Wang ; Kefeng Cai ; Junlin Yin ; Xi Yao

Author_Institution

Functional Mater. Res. Lab., Tongji Univ., Shanghai, China

Volume

6

Issue

3

fYear

2011

fDate

3/1/2011 12:00:00 AM

Firstpage

141

Lastpage

143

Abstract

A facile route to water-soluble CdTe/CdS core/shell quantum dots (QDs) under mild conditions has been developed. The CdTe/CdS core/shell QDs were prepared in alkaline aqueous solution at 50°C under atmospheric pressure, using Cd(CH₃COO)₂·2H₂O and TeO₂ as starting materials, 3-mercaptopropionic acid as the source of sulphur and a stabiliser as well, and KBH₄ as a reductant. The samples were characterised by means of transmission electron microscopy, ultraviolet-visible (UV-vis) absorption spectroscopy and photoluminescence (PL) spectroscopy, respectively. The results show that the diameters of the QDs are increasing with the increasing reaction time, and that UV-vis absorption onsets and PL emission peak of the QDs both have an obvious red shift. The PL property of the QDs can be controlled by adjusting the reaction time. The growth mechanism of the CdTe/CdS core/shell QDs was proposed.

Keywords

II-VI semiconductors; cadmium compounds; liquid phase deposition; photoluminescence; red shift; semiconductor growth; semiconductor quantum dots; transmission electron microscopy; ultraviolet spectra; visible spectra; 3-mercaptopropionic acid; CdTe-CdS; UV-vis absorption spectroscopy; alkaline aqueous solution; photoluminescence spectroscopy; red shift; sulphur; temperature 50 degC; transmission electron microscopy; ultraviolet-visible absorption spectroscopy; water-soluble core-shell quantum dots;

fLanguage

English

Journal_Title

Micro & Nano Letters, IET

Publisher

iet

ISSN

1750-0443

Type

jour

DOI

10.1049/mnl.2011.0012

Filename

5732729