Synthesis of CdSe/ZnS and CdTe/ZnS Quantum Dots: Refined Digestive Ripening

Figure 10

(a) Photoluminescence spectrum of CdTe/ZnS shell with sonication time, (b) HRTEM image of CdTeQDs after 30 min of digestive ripening, (c) after ZnS shell, (d) the characteristic zinc blend planes of 111, 220, and 311 locating at 24.40°, 41.60°, and 47.90° for CdTe core and at 24.94°, 41.72°, and 48.76° for CdTe/ZnS in the 10–60° 2Ø range and (e) the energy dispersive X-ray spectroscopy (EDS) measurement showing the existence of cadmium, tellurium, zinc and sulfur.