A simple-minded approach to describe the metal-containing semiconductor QD in your case is first to agree with a reputable researcher what average diameter the semiconductor nanoparticle should have before you can call it a QD. There is not yet a rigidly defined diameter range although diameters
As for the knowledge on QDs it is still in a state of flux. It is still early for everyone to join the crowd of curious learners about these particles since research findings, both theory and experiment, are still far from sufficient to give a solid fundamental foundation to nanoscience and nanotechnology. Just read relevant research papers and books and be interested in other sources of information on QDs.