Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (12): 2328-2334.doi: 10.3866/PKU.WHXB201409292

• PHOTOCHEMISTRY AND RADIATION CHEMISTRY • Previous Articles     Next Articles

Surface Plasmon Resonance Enhanced Luminescence of Europium Complexes with Ag@SiO2 Core-Shell Structure

LI Jing-Jing, LI Yuan, WANG Ai-Ling, QU Yan-Rong, YUE Bin, ZHOU Dan, CHU Hai-Bin, ZHAO Yong-Liang   

  1. College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China
  • Received:2014-07-31 Revised:2014-09-28 Published:2014-11-27
  • Contact: CHU Hai-Bin, ZHAO Yong-Liang E-mail:binghai99@gmail.com;hxzhaoyl@163.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21161013), Natural Science Foundation of Inner Mongolia, China (2011MS0202), and Opening Foundation for Significant Fundamental Research of Inner Mongolia, China (2010KF03).

Abstract:

Three types of Ag@SiO2 nanoparticles with silica shell thicknesses of around 10, 25, and 80 nm were prepared. Europium complexes with benzoate (BA) in different proportions, 1, 10-phenanthroline (phen) and 2, 2'-bipyridine (bpy), were synthesized and characterized. The results suggest that the complexes have the formulas Eu(BA)nCl3-n ·2H2O (n=1, 2, 3), Eu(phen)Cl3 ·2H2O, and Eu(bpy)Cl3 ·2H2O. The luminescence spectra of the complexes showed that adding Ag@SiO2 nanoparticles increased the fluorescence intensity. The fluorescence enhancement sequence of the different silica shell thickness Ag@SiO2 nanoparticles was 25 nm> 80 nm>10 nm, which showed that the local surface plasmon resonance was strongest at the silica shell thickness of about 25 nm. Furthermore, the enhancement effect for the Eu(phen)Cl3·2H2O complex was the strongest and that for the benzoic complex Eu(BA)nCl3-n·2H2O was the weakest in these complexes. For the three benzoic complexes, the enhancement effect of Eu(BA)3·2H2O was the lowest. The nitrogenous complexes (Eu(phen)Cl3 and Eu(bpy)Cl3) could combine withAg@SiO2 nanoparticles very well, while the interaction of Eu(BA)3· 2H2O with Ag@SiO2 nanoparticles was weaker. Ag@SiO2 nanoparticles are expected to enhance luminescence of rare earth materials.

Key words: Europium complex, Plasmon resonance, Ag@SiO2 nanoparticle, Luminescence intensity, Core-shell structure

MSC2000: 

  • O644