Abstract: Methods for the preparation of inorganic nanoparticles capable of fluorescence, wherein the nanoparticles consist of a host material that comprises at least one dopant. The synthesis of the invention in organic solvents allows to gain a considerably higher yield compared to the prior art synthesis in water. All kinds of objects can advantageously be marked and reliably authenticated by using an automated method on the basis of a characteristic emission. Further, the size distribution of the prepared nanoparticles is nartower which renders a subsequent size-selected separation process superfluous.

Abstract: The invention relates to a simple detection probe containing luminescent inorganic doped nanoparticles (l.i.d nanoparticles) which can be detected after excitement by a source of radiation by their absorption and/or scattering and/or diffraction of the excitement radiation or by emission of fluorescent light, and whose surface is prepared in such a way that affinity molecules for detecting a biological or other organic substance can couple with this prepared surface.