Synthesis and improvement of the optical peroperties of CdTe/CdSe core-shell QDs by using microwave approach

CdTe and CdTe/CdSe QDs synthesized with microwave method.The synthesized QDs were characterized by means of XRD, PL, UV-Vis, FESEM, EDS and RAMAN analysis. XRD, EDS and RAMAN analysis confirmed successfully formation of core-shell structure. CdTe/CdSe core-shell structure is type II. CdTe QDs indicated a band gap emission with peak about 535nm. PL peak intensity increased significantlyand indicated a red shift after CdSe shell growth because of type II core-shell structure. In this method shell thickness simply control by time of microwave radiation that it makes photoluminescence range of QDs from green to red.