Luminescent core/shell nanoparticles

The invention relates to shines particle, comprising (a) is selected from the core in the phosphate, sulphate or fluoride luminescent metal salt is made, which is surrounded with the shell of the metal salt or oxide is made of (b), wherein the nuclear light electronic, wherein the shell of preventing or reducing the energy of the nuclear transfer to the particle surface, e.g of the shell of the non-illumination metal salt or oxide is made, wherein the quantum high yield, used for the fields, comprising mixing and forgery-proof mark.