Iii-v semiconductor core-heteroshell nanocrystals

A method for the manufacture of a core/multishell semiconductor nanocrystal having at least two shells, comprising:

• (i) providing a core,
• (ii) contacting the core with a solution of a first soluble cation or soluble anion selected from Group IIIa, IIa, Va or VIa ions, allowing the cation or anion to react on the core,
• (iii) contacting the core with a counterion selected from Group IIIa, IIa, Va or VIa ions, of the first soluble cation or soluble anion solution of step (ii) and allowing the counterion to react and afford a core/shell1 structure,
• (iv) contacting the core/shell1 structure with a solution of a second soluble cation or soluble anion, selected from Group IIIa, IIa, Va or VIa ions, allowing the cation or anion to react on shell1 of the core/shell1 structure,
• (v) contacting the core/shell1 structure with a second counterion selected from Group IIIa, IIa, Va or VIa ions, of the second soluble cation or soluble anion solution of step (iv) and allowing to react and afford a core/shell1/shell2 structure,
• (vi) optionally repeating steps (ii) to (v) with one or more further solution of a further soluble cation or soluble anion and subsequently a counterion of the further soluble cation or soluble anion to form a core/multishell semiconductor nanocrystal of a higher order
• wherein the core/multishell is undoped and exhibits luminescence at a wavelength from about 400 to about 1600 nm.