4.5. AISe/ZnSe/ZnS QD Synthesis

3.0 mL of the AISe/ZnSe QD solution was added to OA (2.0 mL), OAm (2.0 mL), DDT (6.0 mL), and ODE (6.0 mL). The solution was degassed at 80 °C for 30 min under vacuum, and then, the flask was filled with argon, and the temperature was raised to 130 °C. The ZnS precursor solution was prepared by solubilizing sulfur powder (0.4 mmol) and Zn(OAc)₂ (0.4 mmol) in TOP (3.0 mL) and OLA (200 μL). The solution was degassed at 80 °C for 30 min prior to injection. When the temperature of the reaction mixture reached 130 °C, 3.0 mL of the ZnS precursor was slowly injected over 30 min. After injection, the mixture was maintained at 130 °C for another 30 min. When the reaction finished, the flask was immediately cooled in cold water bath. The product was transferred to a centrifuge tube, precipitated with methanol and ethanol, and then collected by centrifugation at 9000 rpm for 2 min. The pellet was dispersed in toluene. This purification step was repeated three times. The purified AISe/ZnSe/ZnS QDs were then dispersed in a 3.0 mL toluene solution for further use.