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Studies from Institute of Education Have Provided New Data on Nanocrystals

February 28, 2014

By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Nanocrystals. According to news reporting originating in Athens, Greece, by NewsRx editors, the research stated, "The purpose of this study was to perform the influence of the strain (lattice and radius) effects on the optical parameters of nanocrystals for use in medical imaging instrumentation technology. The present manuscript involved (a) quantum dots (QD) based nanophosphors with particle size 3-5 nm in diameter, (b) dielectric constants (core) of nanophosphors in the range 2-4, and the whole portion of the electromagnetic spectrum visible to the human eye, 400-700 nm."

The news reporters obtained a quote from the research from the Institute of Education, "Lattice strain effects on the optical properties were evaluated by the modification of the bulk dielectric function using a Drude-Sommerfeld model for the free or conduction electrons, and a core term representing the bound electrons. The Mie scattering theory, was used to predict the shifted optical parameters. Results showed that (i) lattice stain reduces the real part (n) of refractive index, (ii) the reduction of n becomes higher with the increase of Ecore (0)) and (iii) no significant variations on n were observed under the variability of incident light wavelength (400-700 nm). Light wavelength was found to affect significantly the imaginary part (k) of the complex refractive index. In addition, the radius strain (i) decreases the light extinction coefficient, mext, (ii) increases the anisotropy factor, g and (iii) increases the light absorption probability, p. However, in cases of ecore (w) = 2, radius strain of 5% seems to present slightly higher p values than the cases of radius strain 10%."

According to the news reporters, the research concluded: "The present investigation found that the modification on the optical parameters enhances the utilization of quantom-dots luminescent nanomaterial in optical diffusion studies with requirements of high sensitivity (such as nuclear medical imaging modalities) rather than of high light spatial resolution (such as X-ray projection medical imaging systems)."

For more information on this research see: Strain effects on the optical parameters of quantum dots nanocrystals employed in biomedical applications. Journal of Luminescence, 2014;146():193-198. Journal of Luminescence can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier -; Journal of Luminescence -

Our news correspondents report that additional information may be obtained by contacting P.F. Liaparinos, Inst Educ Technol, Dept. of Med Instruments Technol, Athens 12210, Greece (see also Nanocrystals).

Keywords for this news article include: Athens, Greece, Europe, Quantum Dots, Nanotechnology, Quantum Physics, Emerging Technologies

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Source: Science Letter

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