The rod-shaped nanocrystal research, coupled with earlier work led by Alivisatos in which it was shown that quantum dots or " qdots " nanometer-sized crystal dots ( spheres a few billionths of a meter in size ) made from semiconductors such as cadmium selenide can emit multiple colors of light depending upon the size of the crystal, opened the door to using nanocrystals as fluorescent probes for the study of biological materials, biomedical research tools and aids to diagnosis, and as light-emitting diodes ( LEDs ).
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:Demir's 2008 paper, the basis of some of the pop media coverage ( e . g ., " New Scientist " ) cited above, shows 122 other papers cited it in Google Scholar, and a similar 2006 paper from other researchers on the same idea but with CdSe / CdS ( rather than CdSe / Zn " S " ) wavelength-upconverting nanocrystalline LED coatings shows 300 cites in Google Scholar, and that in turn was based on a breakthrough 2002 paper in " Nature " on narrow-band ( presumably non-tunable ) nanocrystal wide-spectrum QD-LEDs, which is cited by 1, 837 other papers in Google Scholar.
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