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Quantitative analysis of thermal stability of CdSe/CdS core-shell nanocrystals under infrared radiation

Published online by Cambridge University Press:  01 June 2006

A. Singha  and
Anushree Roy
A. Singha
Affiliation:
Department of Physics, Indian Institute of Technology, Kharagpur 721 302, West Bengal, India
Anushree Roy*
Affiliation:
Department of Physics, Indian Institute of Technology, Kharagpur 721 302, West Bengal, India
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Here, we report investigations on the instability in luminescence of bare (trioctylphosphine oxide [TOPO]-stabilized) and CdS-capped CdSe particles under infrared radiation. During thermal annealing under radiation, the formation of oxide layers on the surfaces of the particles create defect states. Consequently, there is a reduction in particle size. These two effects control the light output from the samples. We make a quantitative comparison of the stability of bare CdSe and core-shell-type CdSe-CdS particles during annealing under infrared radiation. Using diffusion theory, we show that the volume of the oxide layer, adhered to the crystallites, plays a dominant role in controlling the luminosity of the particles.

Keywords

LuminescenceNanostructuresOptical properties
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 6 , June 2006 , pp. 1385 - 1389
Copyright
Copyright © Materials Research Society 2006

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