Our approach can be applied in identification of other core:shell systems using rare-earth ions as marker. SiO2/Si(OH)4 is usually used as a coating material due to its chemical stability, optical transparency, easy controllable shell thickness, and biocompatibility. Rare-earth ions doped YVO4 nanoparticles covered with silanol (Si(OH)4) will be useful in biological activity as tracer/fluorescent probes such as immunoassaying, DNA sequencing, and clinical diagnosing. For example, Eu doped YVO4 is used as a red phosphor in cathode ray tube (CRT) and scintillator in medical image detectors, etc. Materials show the attractive luminescence properties. Yttrium orthovanadate (YVO4) has been known to be a polarizer as well as a host lattice for several metal ions in many applications. In this article, Eu3+ is used as marker to prove the formation of core-shell formation in YVO4:SiO2. In our recent works, we have tried to prove core shell formations in ZnO-Eu :Y2O3 and SnO2:SiO2-Eu using luminescence study. Proving of core-shell formation can not be determined much by physical properties. There are many papers in such cases whether it may be luminescence or magnetic materials. High temperature reactions can be carried out using core-shell Pt/SiO2. In magnetic materials, core-shell formation can vary their intrinsic properties. On other hand, if such inorganic host with rare earth ion dopants is dispersed in another system or covered by another system, luminescence intensity can be improved because of extent of reduction of surface effect of particles. If capping agent has large number of O-H, C-H, N-H group in a molecule, luminescence intensity is drastically reduced. In order to reduce agglomeration, organic capping agents are used. Still, such nanoparticles have been found to be agglomerated and thereby luminescence intensity is reduced. Nowadays, inorganic semiconductors/insulators such as ZnO, SnO2, YVO4, Y2O3, and LaF3 etc., and doped with rare-earth ions are used because of thermal, mechanical stabilities and their lower cutoff frequency. These materials decompose above 200 ☌, and because of this, they have limitation in wide range applications. Organic semiconductors are used in lighting, display and laser applications. Key Words: Nanoparticles, excitation, charge transfer band, energy transfer. The manuscript will undergo copyediting, typesetting, an As a service to our customers we are providing this early version o the manuscript.
#Yvo4 yvo4 core shell pdf#
This is a PDF file of an unedited manuscript that has been accepted fo publication. Robindro Singh, Eu3+ as a marker for formation of core shell system: YVO4:SiO2, OpenNano Received date: 27 November 2016 Revised date: 23 January 2017 Accepted date: 25 January 2017Ĭite this article as: L.
Eu3+ as a marker for formation of core-shell system: YVO4:SiO2ĭOI: http ://dx.
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