College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010021, PR China.
J Colloid Interface Sci. 2013 Oct 1;407:164-7. doi: 10.1016/j.jcis.2013.06.059. Epub 2013 Jul 3.
In this work, we report on the preparation of [2,3-f]pyrazino[1,10]phenanthroline-2,3-dicarboxylic anions (PPDB(2-)) modified GdF3:Eu(3+) nanocrystals by a versatile ligand exchange approach for highly enhanced luminescent properties. The samples were carefully characterized by X-ray powder diffraction, transmission electron microscopy, infrared spectra and photoluminescence. It is found that all GdF3:Eu(3+) nanoparticles were entirely composed of homogeneous nano-spheres with an average diameter of about 30-35 nm. After PPDB(2-) capping, GdF3:Eu(3+) nanocrystals exhibited higher color purity and shorter lifetime time, which can be well recognized as a consequence of surface structure modification and local symmetry alteration near Eu(3+) ions. High color purity and short lifetime of PPDB(2-) modified GdF3:Eu(3+) nanocrystals predict highly enhanced red luminescence, which showed the quantum efficiency of ~34%. The highly enhanced luminescent property enables its potential application as chemosensor for detection of heavy metal ions.
在这项工作中，我们通过一种通用的配体交换方法，报告了[2,3-f]吡嗪并[1,10]菲咯啉-2,3-二羧酸阴离子（PPDB(2-))修饰的 GdF3:Eu(3+)纳米晶的制备，以获得高度增强的发光性能。通过 X 射线粉末衍射、透射电子显微镜、红外光谱和光致发光对样品进行了仔细的表征。结果发现，所有的 GdF3:Eu(3+)纳米颗粒均由平均直径约为 30-35nm 的均匀纳米球组成。在 PPDB(2-)封端后，GdF3:Eu(3+)纳米晶表现出更高的色纯度和更短的寿命时间，这可以很好地归因于表面结构修饰和 Eu(3+)离子附近的局部对称性改变。PPDB(2-)修饰的 GdF3:Eu(3+)纳米晶的高色纯度和短寿命预示着其红色发光的显著增强，其量子效率约为 34%。这种高度增强的发光性能使其有望作为化学传感器用于检测重金属离子。
