Tunable emission colors are shown by a single‐component emitter incorporating an EuIII moiety as the origin of red light and an organic ligand comprising coumarin (blue emission) and Rhodamine6G (green emission) fluorophores. This dye can emit three individual primary colors (blue, green, and red) as well as nearly pure whitelight (see picture).
A system based on FRET mechanism, comprising a coumarindonor and a rhodamineacceptor, was developed for the selective and quantitative detection of metal ions. Fluorescent chemosensors RCs, linked by 1,2-diethylamine, exhibit significant fluorescence enhancement and excellent selectivity toward Cu2+. Fluorescent probes CRB and CR6G, linked by hydrazide, function as ratiometric receptors for Cu2+