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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.