Citation:
Vaganova, E. ; Yitzchaik, S. ; Shapiro, L. ; Sigalov, M. ; Khodorovsky, V. Photoinduced Reversible Emission Switching in Pyridine / Europium(III) Chloride / Organic Fluorophore System. Advanced Materials 2000, 12, 1669-1671.
Abstract:
A blue–red reversible optical switch has been created by combining EuIII, pyridine, and a fluorescent organic chromophore. The initial solution exhibits the expected blue emission of the chromophore until UV irradiation leads to red emission (see Figure), a process that is ascribed to protonation of the pyridine and formation of a charge-transfer complex with the chromophore in the excited state, allowing the red EuIII photoluminescence to be emitted.