Synthesis and Electroluminescence in CdSe nanocrystals

摘要

Currently there is a great interest in II-VI semiconductor nanoparticles, particularly organically capped soluble particles of cadmium and selenide, for their ready to use application in devices. In this study, CdSe nanocrystalshave been synthesized by using starch as a capping agent through a chemical synthesis route at room temperature. Samples have been prepared varying quantity of precursor for Cadmium. It is observed that a turn on voltage is required for light emission and brightness increases exponentially with voltage. Turn on voltage is found to decrease as CdCl_2 concentration is increased. The voltage-current curve represents ohmic nature for all EL cell. The EL spectra also show blue shift with increasing CdSe concentration. This tunability of band gap as well as light emission with size is very important in display applications.