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Characteristics of synthesized CdSe/ZnS quantum dots. a The absorbance and emission spectra of synthesized QDs. The blue lines represent absorbance (the curves from the upper left to the lower-middle part) and the red lines represent the photoluminescence (the curves with an obvious protrusive shape) of the QDs at an emission peak of 655 nm. b TEM image of CdSe/ZnS QDs. Insets in b showed the HRTEM images of core–shell QDs
