Hence, rod-Y 2O 3:Eu 4:Eu 3+ could be an excellent candidate for sensitive fluorescent probes, showing similar performance to most quantum dots for the detection of ions and molecules. Herein, we develop a novel sensitive fluorescent probe with an open core/shell nanostructure (OCSNS), rod-Y2O3:Eu3+0.01YVO4:Eu3+, in which a YVO4:Eu3+. As expected, this OCSNS shows “off-and-on” fluorescence properties due to the strong surface effect of this open quantum shell: it is “off” when detecting trace Cu( II) ions and “on” when detecting trace amino acids, at levels as low as 10 −8 mol L −1. YVO4:Eu3+,Bi3+ phosphor layers by the Pechini-type SG process, and it leads to the formation of coreshell structured SiO2/YVO4:Eu3+,Bi3+ phosphors.
The two-step hydrothermal method is adopted YVO4: Eu<3+> nano-luminescent granule is hydrothermally synthesized in water at 250 DEG C.The particle size of the phosphor powder is 30 to 100 nanometers.
The mol ratio of the core of YVO4: Eu<3+> and the crust of YPO4 is 1:2-8:1. In contrast to closed core Y 2O 3:Eu YVO 4:Eu 3+, which has only one excitation band peaking at ∼308 nm, this novel nanostructure has a wide-wavelength excitation response that can be decomposed into two components centered at ∼254 and ∼280 nm, which stem from open core rod-Y 2O 3:Eu 3+ and the YVO 4:Eu 3+ quantum shell, respectively. The molarity of the core europium of YVO4: Eu<3+> is 1 to 8 percent.High-resolution transmission electron microscopy (HR-TEM) observations clearly confirm that this OCSNS has an open quantum shell of YVO 4:Eu 3+. The photo-luminescent performance of the OCSNS is sensitive to trace ions or molecules. Herein, we develop a novel sensitive fluorescent probe with an open core/shell nanostructure (OCSNS), rod-Y 2O 3:Eu 4:Eu 3+, in which a YVO 4:Eu 3+ shell with a thickness of less than 5 nm partially covers an anisotropic core of rod-Y 2O 3:Eu 3+.
0 kommentar(er)
