Preparation and the investigation of its electrochemical and photoluminescent characteristics of organic–inorganic hybrid multilayers containing europium-substituted heteropolytungstate

Photoluminescent multilayers were fabricated by layer-by-layer deposition between europium-substituted heteropolytungstate K13[Eu(SiW11O39)2]·28H2O (denoted ESW) and a cationic polymer of quaternized poly(4-vinylpyridine) partially complexed with osmium bis(2,2′-bipyridine) (denoted as QPVP-Os) on glassy carbon and quartz substrates. The resulting photoluminescent organic–inorganic hybrid multilayers were characterized by electrochemical impedance spectroscopy, UV-Vis absorption spectrometry, cyclic voltammetry and photoluminescence spectra. Electrochemical impedance spectroscopy, UV-Vis absorption spectrometry and cyclic voltammetry results demonstrated that the multilayers were regular growth each layer adsorption. The photoluminescent properties of the films at room temperature were investigated to show the characteristic Eu3+ emission pattern of 5D0→7Fj.