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 E-Mail IMAGE: Martin Gruebele, right, and graduate student Huy Nguyen demonstrate that economical carbon-based quantum dots emit enough light when excited to eventually replace the expensive and toxic metal quantum dots used. view more  Credit: Photo by L. Brian Stauffer CHAMPAIGN, Ill. Tiny fluorescent semiconductor dots, called quantum dots, are useful in a variety of health and electronic technologies but are made of toxic, expensive metals. Nontoxic and economic carbon-based dots are easy to produce, but they emit less light. A new study that uses ultrafast nanometric imaging found good and bad emitters among populations of carbon dots. This observation suggests that by selecting only super-emitters, carbon nanodots can be purified to replace toxic metal quantum dots in many applications, the researchers said.

United statesUniversity of illinoisBeckman instituteIllinois collegeMartin gruebeleJamesr eisznerBeckman institute for advanced scienceUniversity of delawareNational institute of biomedical imagingProceedings of the national academy sciencesCarle illinois college of medicine atBlood instituteNational heartUniversity of illinois urbana champaignNational academyIllinois urbana champaign