Since this broad-band response to excitation in the range of 225-340 nm gave more red/dark red emissions found at 612, 616 and 620 nm, the novel phosphor could have potential biological labeling applications with wide flexibility. Preparation and properties of multifunctional Fe 3 O 4 YVO 4 :Eu 3+ or Dy 3+ core-shell nanocomposites as drug carriers Zhiwei Sun,a Lizhu Tong,a Deming Liu,a Jianhui Shi a and Hua Yang a Author affiliations Abstract In this study, the synthesis and characterization is reported for Fe 3 O 4 /YVO 4 :Eu 3+ or Dy 3+ luminomagnetic nanocomposites. The emissions were dominated by or transitions of Eu(3+) when excited with different wavelengths. In this work, a novel core-shell and inorganicorganic hybridization strategy has been employed to fabricate Eu3+-doped YVO4 nanoparticles to broaden their. The PL showed that the red-emitting phosphor possessed the independent luminescent properties of both the core Y(2)O(3):Eu(3+) and the shell YVO(4):Eu(3+). The XRD, FE-SEM and HR-TEM results indicate that the SiO(2) and YVO(4):Eu(3+) layers have been successfully coated on Y(2)O(3):Eu(3+) nanoparticles and SiO(2) layer, respectively: these layers were further verified by the EDS. Furthermore, shell ratio plays a critical role in their PL efficiency. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), energy-dispersive x-ray spectra (EDS) and photoluminescence (PL) were all employed to characterize the composite core-shell phosphors. As for the first example, its synthetic route, structure and optical properties are presented in this paper. Multi-layer core-shell nanoparticles (YVO4:Nd3+/mSiO(2)/SiO2) consisting of silica cores (SiO2), mesoporous silica (mSiO(2)) intermediate layers, and Neodymium. A novel polychromic phosphor with core-shell heteronanostructure has been prepared to improve the chromatic index of phosphors. Meanwhile, the as-prepared coreshell structured nanocomposite (YVO4:EuMIPs), which was composed of lanthanide doped YVO4:Eu as fluorescent signal and.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |