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. 2015 Oct 8;5:14817. doi: 10.1038/srep14817

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PL spectra of Ag:ZnSe QDs (a) and of Ag,Cu: ZnSe QDs (b) at different Ag doping amount. Schematic illustration of energy levels of Ag:ZnSe QDs (c) and Ag,Cu:ZnSe QDs (d).