Photoluminescent multilayer films based on polyoxometalates

Lin Xu; Hongyu Zhang; Enbo Wang; Dirk G. Kurth; Zhuang Li

doi:10.1039/B108283C

Lin Xu,^a Hongyu Zhang,^a Enbo Wang,*^ab Dirk G. Kurth^c and Zhuang Li^d

* Corresponding authors

^a Department of Chemistry, Northeast Normal University, Changchun, P. R. China
E-mail: linxu@nenu.edu.cn
Fax: +86 431 5684009

^b Coordination Chemistry Institute, State Key Laboratory of Nanjing University, Nanjing, P. R. China

^c Max-Planck-Institute of Colloids and Interfaces, Potsdam, Germany

^d Changchun Institute of Applied Chemistry, Academia Sinica, Changchun, P. R. China

Abstract

Ultrathin multilayer films consisting of the polyoxotungstoeuropate cluster K₁₂[EuP₅W₃₀O₁₁₀] (EuP₅W₃₀) and poly(allylamine hydrochloride) (PAH) have been prepared by the layer-by-layer self-assembly method. The (EuP₅W₃₀/PAH) multilayer films have been characterized by small-angle X-ray reflectivity measurements, X-ray photoelectron spectra, and atomic force microscopy (AFM). From the AFM images, the thickness of the {PEI/PSS/PAH(EuW₃₀/PAH)} multilayer film was estimated to be 6.5 nm, corresponding to an average thickness of ca.1.1 nm for a EuW₃₀/PAH layer pair. The photoluminescent behavior of the film at room temperature was investigated to show the characteristic Eu³⁺ emission pattern of ⁵D₀ → ⁷F_J. The fluorescence behavior of the multilayer film is essentially identical to that of H_n[EuP₅W₃₀O₁₁₀]^{(12 − n)−} in a concentrated aqueous solution, except for the relative intensities and peak bandwidths. The occurence of photoluminescent activity confirms the potential for creating luminescent multilayers with polyoxometalates (see ).

Supplementary files

Article information

DOI: https://doi.org/10.1039/B108283C
Article type: Paper
Submitted: 12 Sep 2001
Accepted: 13 Nov 2001
First published: 28 Jan 2002

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J. Mater. Chem., 2002,12, 654-657

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