Luminescence modulation of two individual fluorophores over a wide pH range and intracellular studies

Modulation of the luminescence could be realized at variable physiological pH values (from 8 to 2) by consecutive changes in the form and intensity of both europium and ligand emissions. The achieved multiple optical signal shifts (blue-red-green) and especially the performance of the well-defined lanthanide complex under strong acidic condition have never been reported.164