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Top: Stability of coumarin–DTPA–Eu (obs., 620 nm) and DTPA–coumarin (obs., 450 nm) fluorescence intensity on excitation at 791 nm. Bottom: Stability of ANTHR–DTPA–Tb (obs., 550 nm) and DTPA–ANTHR (obs., 420 nm) fluorescence intensity on excitation at 791 nm. The solutions are in 80% glycerol containing 1 mM MOPS.
