Patent ID: 8784703
Filing Date: 2014-07-22
Classification: C09K,H01L

Abstract:
1. A method of making a colloidal solution of high confinement semiconductor nanocrystals, comprising: (a) forming a first solution by combining a solvent, growth ligands, and at most one semiconductor precursor; (b) heating the first solution to a nucleation temperature; (c) adding to the first solution, a second solution having a solvent, growth ligands, and at least one additional and different precursor that includes binary or ternary II-VI, III-V, or IV-VI semiconductor materials in the first solution to form a crude solution of nanocrystals having a compact homogenous semiconductor region; (d) waiting for 0.5 to 20 seconds and then adding to the crude solution a third solution having a solvent, growth ligands, and at least one additional and different precursor than those in the first and second solutions and includes ternary or quaternary II-VI, III-V, or IV-VI semiconductor materials; (e) lowering the nucleation temperature to a growth temperature to enable the formation of a gradient alloy region around the compact homogenous semiconductor region, resulting in the formation of a colloidal solution of high confinement semiconductor nanocrystals.