Abstract
This paper discusses the optical properties of colloidal CdSe/CdTe, CdTe/CdSe,
and CdTe/CdS heterostructures synthesized by growing a shell on CdSe and CdTe
nanocrystals. The extinction coefficients of the first exciton absorption band and the
extinction coefficients at 400 nm are determined as a function of the amount of shell
material added during the growth of the heterostructures. It is shown that the resulting
heterostructures have extinction coefficients 1–2 orders of magnitude greater than the
initial cores: up to 0.3×10<sup>7</sup>cm<sup>−1</sup>M<sup>−1</sup> in the case of
CdTe/CdS and CdTe/CdSe and up to 1.6×10<sup>7</sup>cm<sup>−1</sup>M<sup>−1</sup> in the
case of CdSe/CdTe. It is shown that the luminescence wavelength in the 550–950-nm range
can be controlled by varying the shell size for CdSe/CdTe heterostructures.
© 2011 OSA
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