Fig. 2. (a and b) PL spectra of AIS QDs (a) and CAIS QDs (b) before Zn addition (curves 1) and after the addition at a Zn : Ag ratio of 2 : 1 (curves 2), 10 : 1 (curves 3), and 20 : 1 (curves 4); (c) integral PL intensity of CAIS/ZnS QDs as a function of Zn : Ag ratio. Figures on the graph indicate bandgap values for corresponding samples. Insert: photograph of CAIS/ZnS series with an increasing Zn : Ag ratio under the UV illumination. Ag : In : S = 2 : 7 : 10.