Patent ID: 7776630

Claim:
A method for fabricating a dopant based core/shell/shell semiconductor having a quantum dot core with a tunable excitation band-gap consisting of the steps of: selecting an acetate precursor of semiconductor materials having identical crystal structures with minimal lattice mismatch; adding a bivalent transition metal ion as a dopant; mixing the acetate precursor of semiconductor material and bivalent transition metal ion dopant in a first water-in-oil emulsion at room temperature; mixing a sulfide ion source in a second water-in-oil emulsion at room temperature; combining the first water-in-oil emulsion with the acetate precursor of semiconductor material and bivalent transition metal with the second water-in-oil emulsion containing the sulfide ion source, at room temperature to form a quantum dot (Qdot) alloy core; and growing an outer semiconductor material shell layer about the Qdot core to form a ternary alloy core/shell dopant based quantum dot semiconductor said semiconductor comprising: an alloy of cadmium sulfide (CdS) and zinc sulfide (ZnS) semiconductor materials to form a core; a concentric layer composed of in-situ formed Cd x Zn (1-x) S alloy embedded with the dopant manganese (Mn) forming an inner shell surrounding the core; and an outer shell of zinc sulfide (ZnS).