Study on effects of tungstophosphate structures on electrochemically induced luminescence switching behaviors of the composite films consisting of tris(1,10-phenanthroline) rutheniumElectronic supplementary information (ESI) available: The preparation procedure of the composite films, the characterization of the solutions and the composite films, and electrochemically induced fluorescence switching illustration. See DOI: 10.1039/c4tc02774d

For exploration of the effects of tungstophosphate structures on electrochemically induced fluorescence switchable behaviors, four composite films consisting of tris(1,10-phenanthroline) ruthenium (Ruphen) and tungstophosphates with different structures (PW: [PW 12 O 40 ] 3− (PW 12 ), [P 2 W 18 O 62 ] 6− (P 2 W 18 ), [NaP 5 W 30 O 110 ] 14− (P 5 W 30 ), and [H 7 P 8 W 48 O 184 ] 33− (P 8 W 48 )) were prepared by the layer-by-layer self-assembly method under identical conditions. The composite films were characterized by cyclic voltammetry, UV-vis spectroscopy, X-ray photoelectron spectroscopy, fluorescence spectroscopy and atomic force microscopy. In situ fluorescence spectroelectrochemical measurements display that the fluorescence quenching efficiencies of the four composite films under electrochemical stimulation depend on the tungstophosphate structures, demonstrating that the desired electrochemically induced fluorescent switchable materials can be optimized by the choice of different polyoxometalates. A series of composite films consisting of different tungstophosphates were fabricated and their electrochemically induced fluorescence switchable behaviors were investigated.