Alloyed NCs were synthesized by the addition of Cd or Zn precursor to a CIS synthetic reaction system as reported previously (Li et al. 2009; Deng et al. 2012). For the preparation of Cd-alloyed CIS NCs, indium acetate (0.1 mmol), copper (I) acetate (0.1 mmol),DDT (2.0 mL), oleic acid (0.4 mL), and 6 mL of octadecene (ODE) were added into a 50 mL threenecked, round-bottom flask. The reaction solution was degassed under vacuum for 10 min at room temperature until no bubbles were observed and solutions were then heated to 140 C at a rate of 20 C/min under vacuum using a heating mantle. An argon atmosphere was next introduced into the flask and CdO [0–0.5 mL of 0.1 M in ODE/oleylamine/oleic acid (2:1:1)] wasinjected at 140 C. The temperature of the resulting solution was quickly raised to 260 C at a rate of 10 C/min.