Patent ID: 7172791

Claim:
A luminescent nanoparticle prepared according to the method comprising the steps of: a. preparing a semiconductive core according to a method comprising adding a first amount of a first core precursor and a first amount of a second core precursor to form a reaction solution and reacting the first core precursor with the second core precursor under conditions which result in the formation of the semiconductive core and the presence of an amount of a first additive comprising unreacted first core precursor, second core precursor, or both the first and second core precursors in the reaction solution; b. heating the core to a temperature sufficient to induce formation of an inorganic shell on the core upon addition thereto of the shell precursors; c. admixing with the reaction solution a first shell precursor and a second shell precursor to form a reaction dispersion; and d. maintaining the reaction dispersion at a temperature for a period of time sufficient to induce formation of an inorganic shell on the semiconductive core.