Highly luminescent water-soluble lanthanide nanoparticles through surface coating sensitization

被引：51
作者：
Charbonniere, Loic J. [1 ]
Rehspringer, Jean-Luc [2 ]
Ziessel, Raymond [1 ]
Zimmermann, Yvan [3 ]
机构：
[1] ULP, CNRS, ECPM, Lab Chim Mol,UMR 7509, F-67087 Strasbourg 02, France
[2] ULP, CNRS, IPCMS GMI, UMR 7504, F-67034 Strasbourg 2, France
[3] ULP, CNRS, LMSPC ECPM, UMR 7515, F-67087 Strasbourg 02, France
来源：
NEW JOURNAL OF CHEMISTRY | 2008年 / 32卷 / 06期
关键词：
D O I：
10.1039/b719700d
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Water-soluble La0.95Eu0.05F3 center dot AEP (AEP = aminoethylphosphate) nanoparticles (NPs) were shown to react with 6-carboxy-5'-methyl-2,2'-bipyridine (bipyCOO(-)) in water, resulting in an increase of more than two orders of magnitude of the europium centred emission upon excitation at 305 nm. Nanoparticles coated by the bipyCOO(-) ligands were prepared by surface ligand exchange in water, isolated and characterized by infrared spectroscopy, transmission electron microscopy, energy dispersion X-ray analysis and dynamic light scattering. These analyses compared to those of the genuine NPs sample confirmed the partial replacement of AEP by bipyCOO(-), with retention of the original morphology of the particles. The photo-physical properties of the isolated La0.95Eu0.05F3 center dot bipyCOO(-) NPs were measured in water by absorption, steady-state and time-resolved luminescence spectroscopies and revealed that the large increase of the luminescence of the NPs is due to a surface generated antenna effect where coated bipyCOO(-) moieties efficiently absorb light and transfer the energy to the emitting europium atoms of the NPs.
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收藏
页码：1055 / 1059
页数：5
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