Factors that are important to optimize during inorganic passivation include the energy levels of the shell and core, the formation of a defect-free and uniform coating, coherence strain between with the shell and core lattice, and the thickness of the shell layer. The maximum PL efficiency of the core/shell QD is dependent on the thickness of the shell layer, which has been found to be less than two monolayers thickness for optimum properties of a CdSe/CdS core/shell structured nanoparticle. Thicker capping layers lead to the formation of misfit dislocations, which are also sites of non-radiative recombination, leading to a decrease in the PL QY