1. A process for preparing quantum nanostructures comprising the steps of: (a) contacting a first cation source and a second cation source, the first cation source comprising a metal and at least one first ligand and the second cation source comprising the metal and at least one second ligand, and an anion source comprising a metal and at least one ligand, optionally, in a solvent, to form a reaction mixture; and (b) maintaining the reaction mixture from (a) at a temperature and time sufficient to form the quantum nanostructures, wherein the first cation source is a nucleation source and the second cation source is a growth source, and at least 90% of the first cation source reacts before more than 10% of the second cation source reacts.