Patent ID: 7867557

Claim:
A method for producing a nanoparticle comprised of a core comprising a core semiconductor material, a first layer comprising a first semiconductor material provided on said core and a second layer comprising a second semiconductor material provided on said first layer, said core semiconductor material being different to said first semiconductor material and said first semiconductor material being different to said second semiconductor material, the method comprising: effecting conversion of a nanoparticle core precursor composition to the material of the nanoparticle core; depositing said first layer on said core; and depositing said second layer on said first layer, said core precursor composition comprising a first precursor species containing a first ion to be incorporated into the growing nanoparticle core and a separate second precursor species containing a second ion to be incorporated into the growing nanoparticle core, said conversion being effected in the presence of a molecular cluster compound different from the nanoparticle core precursor composition.