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Here, stable ternary Pb<jats:sub>1\u2212<jats:italic>x<\/jats:italic><\/jats:sub>Cd<jats:sub><jats:italic>x<\/jats:italic><\/jats:sub>S QDs were synthesized by in situ coprecipitation of Pb<jats:sub>4\u2212<jats:italic>n<\/jats:italic><\/jats:sub>Cd<jats:sub><jats:italic>n<\/jats:italic><\/jats:sub>O<jats:sub>4<\/jats:sub> bimetallic clusters in an aqueous solution, which possess a uniform size of 4.0\u00b10.2\u2005nm and the second near\u2010infrared (NIR\u2010II) emission at 1100\u2005nm with photoluminescence quantum yield (PLQY) as high as 17.72\u2009%. Stored at 4\u2009\u00b0C and in colloidal form, the PLQY of Pb<jats:sub>1\u2212<jats:italic>x<\/jats:italic><\/jats:sub>Cd<jats:sub><jats:italic>x<\/jats:italic><\/jats:sub>S QDs remained at 90.9\u2009% of the initial value after 15\u2005days, while stored as powder, the spectra did not change after 5\u2005months. 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