摘要
Luminescent silica nanocomposites functionalized with a Eu-complex have been prepared and characterized. The europium complex is composed of 2,2＇-bipyridyl （BPy） and 2-（4-bromomethyl）- phenylpropionic acid （BMPPA）, which contains highly active benzyl bromide substituents and can covalently bind with poly（4-vinylpyridine） （P4VP）-modified silica nanoparticles （nanoSiO2P4VP） to form nanoSiO2P4VPEuBIy composites. Microscopic images revealed that the nanoSiO2P4VPEuBPy composites easily formed aggregates, due to an inter-particle binding caused by the benzyl bromide among the composites. The as-prepared nanocomposites showed the typical emissions of Eu（III） ions at the wavelengths from 580 nm to 750 nm designated to the SDo- 7Fn transitions. Time-resolved fluorescence decay measurements revealed that the emission lifetime was approximately 0.204 ms and 0.5？6 ms for the nanoSiO2EuBPy composites, a little shorter than that in the Eu（BMPPA）3BPy complex.
Luminescent silica nanocomposites functionalized with a Eu-complex have been prepared and characterized. The europium complex is composed of 2,2＇-bipyridyl （BPy） and 2-（4-bromomethyl）- phenylpropionic acid （BMPPA）, which contains highly active benzyl bromide substituents and can covalently bind with poly（4-vinylpyridine） （P4VP）-modified silica nanoparticles （nanoSiO2P4VP） to form nanoSiO2P4VPEuBIy composites. Microscopic images revealed that the nanoSiO2P4VPEuBPy composites easily formed aggregates, due to an inter-particle binding caused by the benzyl bromide among the composites. The as-prepared nanocomposites showed the typical emissions of Eu（III） ions at the wavelengths from 580 nm to 750 nm designated to the SDo- 7Fn transitions. Time-resolved fluorescence decay measurements revealed that the emission lifetime was approximately 0.204 ms and 0.5？6 ms for the nanoSiO2EuBPy composites, a little shorter than that in the Eu（BMPPA）3BPy complex.
基金
supported by National Natural Science Foundation of China(No.21373058)
