Patent ID: 7410810

Claim:
An assay kit for carrying out an assay method based on a resonance energy transfer (RET), said assay kit comprising: a) a first molecule group A which is labeled with at least one energy donor (donor), and b) at least a second molecule group B which is labeled with at least one energy acceptor (acceptor), wherein the donor comprises a molecule or particle which can be energetically excited by an external radiation source and is capable of fluorescing, the acceptor comprises a molecule or particle which can be excited by energy transfer by way of the donor, with partial or complete quenching of the donor fluorescence, and donor and/or acceptor comprise luminescent inorganic doped nanoparticles (lid nanoparticles) which have a breadth of >50 nanometers and which, after an energetic excitation, emit electromagnetic radiation with a Stokes shift or an anti-Stokes shift.