Abstract: The invention relates to a method for producing a luminescent layered silicate composite. The method according to the invention is characterized in that at least one luminescent dye, in particular fluorescent dye, on the basis of at least one complex, essentially a chelate complex, of at least one element of the rare earth elements (“rare earth complex”) is introduced between and/or stored in at least two layers of at least one layered silicate (“layered silicate layers”) respectively or that at least one luminescent dye, in particular fluorescent dye, on the basis of at least one complex, essentially a chelate complex, of at least one element of the rare earth elements (“rare earth complex”) is combined with a layered silicate to form a composite. The luminescent layered silicate composite according to the invention can be used for marking objects, for example plastic-based objects, or in the field of bioanalysis.

Abstract: The invention relates to the use of at least two different fluorophores for configuring a fluorescence resonance energy transfer pair (FRET pair), wherein at least one first fluorophore (A) serves as the donor fluorophore and at least one second fluorophore (B) serves as the acceptor fluorophore within the FRET pair, wherein the first fluorophore (A) and the second fluorophore (B), independently of each other, each are configured on the basis of an organo-metal complex of rare earth elements, wherein the fluorophores (A) and (B) comprise different rare earth elements from each other.