Novel rod-Y2O3:Eu3+@0.01YVO4:Eu3+ with open core/shell nanostructure and "off-and-on" fluorescent performance

作者：Han, Nianchen; Gao, Xueshan; Lu, Guang; Zeng, Daiwen; Wan, Xia; Tie, Shaolong^*; Lan, Sheng^*

来源：RSC Advances, 2017, 7(83): 52955-52961.

DOI：10.1039/c7ra08905h

• LIGHT-EMITTING-DIODES
• QUANTUM-DOT
• LUMINESCENT PROPERTIES
• OPTICAL-PROPERTIES
• PARTICLES
• EMISSION
• PHOSPHOR
• Y2O3
• EXCITATION
• EU3+

Herein, we develop a novel sensitive fluorescent probe with an open core/shell nanostructure (OCSNS), rod-Y2O3:Eu3+@0.01YVO(4):Eu3+, in which a YVO4: Eu3+ shell with a thickness of less than 5 nm partially covers an anisotropic core of rod-Y2O3: Eu3+. The photo-luminescent performance of the OCSNS is sensitive to trace ions or molecules. High-resolution transmission electron microscopy (HR-TEM) observations clearly confirm that this OCSNS has an open quantum shell of YVO4:Eu3+. In contrast to closed core Y2O3:Eu3+@shell YVO4:Eu3+, which has only one excitation band peaking at similar to 308 nm, this novel nanostructure has a wide-wavelength excitation response that can be decomposed into two components centered at similar to 254 and similar to 280 nm, which stem from open core rod-Y2O3:Eu3+ and the YVO4:Eu3+ quantum shell, respectively. 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. Hence, rod-Y2O3:Eu3+@ 0.01YVO(4):Eu3+ could be an excellent candidate for sensitive fluorescent probes, showing similar performance to most quantum dots for the detection of ions and molecules. Moreover, it is both easier to fabricate and more stable than quantum dots.

• 出版日期2017
• 单位华南师范大学