Investigation of electronic and optical properties of (CdSe/ZnS/CdSe/ZnS) quantum dot–quantum well heteronanocrystal |
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Authors: | A SalmanOgli A Rostami |
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Institution: | (1) Photonics and Nanocrystal Research Lab, Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran |
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Abstract: | In this article, we have investigated the photoluminescence intensity of quantum dot–quantum well heteronanocrystal with non-linear
potential profile which has been analyzed by the finite element numerical methods and is compared with traditional potential
profile of same heteronanocrystal. We have probed the effect of carrier localization in layers of heteronanocrystal on the
photoluminescence intensity. Moreover, the effects of variation of radius layers such as CdSe core, shell, and ZnS barriers
radius on the photoluminescence intensity are studied. Besides, for the first time, we demonstrated the shift of quantum dot–quantum
well operation wavelength by introducing non-linear potential profile in the core of heteronanocrystal that can be drastically
affected on biological application. Furthermore, in biological application, by tuning the emission wavelengths of quantum
dot into the far-red and near-infrared ranges, the non-invasive in vivo imaging technique was developed. In this wavelength
window, tissue absorption, scattering, and auto-fluorescence intensities have minimum quantities. In our article with new
structure, the relation between size and operation wavelength don’t follow traditional relation. |
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