Preparation and Electroswitchable Luminescence Properties of Nanocomposite Films of Polyoxometalates and Ru(phen)3Cl2†

doi:10.7503/cjcu20150809

Abstract

Abstract:

The red luminescence films [(PEI/P₈W₄₈)_m/PEI/PSS/Ru(phen)/PSS]_n[m=1, 3, 5; PEI=Poly(ethyleneimine); PSS=poly(sodium 4-styrenesulfonate)] were fabricated by layer-by-layer assembling method based on electrochromic polyoxometalate P₈W₄₈ and luminescent complex Ru(phen). The composition and thicking of the films were characterized by UV-Vis spectrophotometry. The electrochemical and luminescent properties were studied by cyclic voltammetry and fluorescence spectrophotometry, respectively. The composite films displayed reversible electrochromic and electroswitchable luminescence properties during redox potential switching. The electrochromic and luminescence switching abilities of the films were almost not changed by double potential steps(-0.85 V/0.85 V) for 50 cycles, suggesting good electrochemical stability of the films.

Key words: Polyoxometalate, Controllable self-assembly, Luminescent film, Electrochromic property, Luminescence switch

CLC Number:

O611.3

TrendMD:

WANG Bin, WANG Xiaohong, LIU Zongrui, DUAN Limei, XU Ling, BAI Suozhu. Preparation and Electroswitchable Luminescence Properties of Nanocomposite Films of Polyoxometalates and Ru(phen)₃C $l 2 †$ [J]. Chem. J. Chinese Universities, 2016, 37(5): 822.

Figures/Tables 9

Scheme 1 Schematic of preparation of LBL films

Fig.1 Chemical structures of the compounds

Fig.2 UV-Vis spectra of 1×10-5 mol/L P8W48(a) and 1×10-5 mol/L Ru(phen)3Cl2(b)(A) and the [PEI/P8W48/PEI/PSS/Ru(phen)/PSS]n multilayers(B)Inset shows the absorbance at 268 and 450 nm as a function of layer number(n).

Fig.3 CVs of 1 mmol/L P8W48(A), 1 mmol/L Ru(phen)3Cl2 (B) and the [PEI/P8W48/PEI/PSS/Ru(phen)/PSS]15 multilayers(C)

Fig.4 Fluorescence spectra of 1 μmol/L Ru(phen)3Cl2 solution(A) and the [(PEI/P8W48)m/PEI/PSS/Ru(phen)/PSS]15 thin films(B)(B) a. m=1; b. m=3; c. m=5.

Fig.5 UV-Vis spectra(A, C) and fluorescence spectra(B, D) of [(PEI/P8W48)3/PEI/PSS/Ru(phen)/PSS]15 thin film at applied potential -0.85 V(A, B) and 0.85 V(C, D) as a function of time

Fig.6 Electroswitchable luminescence illustration of the composite film

Fig.7 Fluorescence spectra of [(PEI/P8W48)m/PEI/PSS/Ru(phen)/PSS]15(m=1, 3, 5) thin film at open circuit(a), -0.85 V(b) and 0.85 V(c)(A) m=1; (B) m=3; (C) m=5. The insets are the normalized intagral area under redox potential 0.85 V and -0.85 V with different cycles.

Fig.8 Chronoamperometry curves(A) and absorbance at 590 nm(B) of the hybrid film [PEI/P8W48/PEI/PSS/Ru(phen)/PSS]15 under double potential steps from -0.85 V to 0.85 V

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Preparation and Electroswitchable Luminescence Properties of Nanocomposite Films of Polyoxometalates and Ru(phen)₃C $l 2 †$

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