Quantum dots are tiny nanocrystals with extraordinary optical and 
electrical properties with possible uses in dye production, bioimaging, 
and solar energy production. 
Researchers at the University of Illinois 
at Chicago have developed a way to introduce precisely four copper ions 
into each and every quantum dot.
The introduction of these “guest” ions, called doping, opens up 
possibilities for fine-tuning the optical properties of the quantum dots
 and producing spectacular colors.
Credit: http://news.uic.edu 
 

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