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Type-II core-shell CdTe/CdSe QDs synthesized in one pot. (A) Normalized fluorescence emission spectra showing the transition from CdTe cores (red curve) to CdTe/CdSe core-shell QDs emitting in the near-infrared (black curve). (B) Optical absorbance showing the red-shifting and eventual loss of the first exciton peak as the CdSe shell is grown on the CdTe core, typical of type II QDs.
