Preparation, Characterization and Functionalization of Rare Earth Luminescent and Up-converting Nanoparticles
|School||Inner Mongolia University|
|Keywords||Microemulsion - hydrothermal Rare earth fluorescent nanoparticles Upconversion luminescence Surface modification Functionalized|
Rare earth fluorescence upconversion nanophosphors phosphor imaging, solid-state light source, X-ray intensifying screens, laser and fiber amplifier and biological fluorescent probes and other fields have a wide range of applications. Rare earth luminescent absorption ability, high conversion efficiency can be emitted from the ultraviolet to the infrared light spectrum. Upconversion luminescence is a unique form of light rare earth, rare earth conversion nano-light-emitting materials in infrared light excitation can produce visible emission and emission line narrow (long life), light stable (less susceptible to environmental impact) and fluorescence The background is low, and therefore has a broader application in biological fluorescence imaging. Rare earth fluorescence and up-conversion light-emitting nano-particles as a biological fluorescent probes in biological fluorescence imaging applications is limited by certain factors, first, the size and morphology-controlled, high-quality, with characteristic luminescence properties of rare earth luminescent nanoparticles effective synthesis method is not much; Secondly, the conventional method of synthesis of rare earth luminescent nanoparticles water-soluble and biocompatible; mature, proven rare earth luminescent nanoparticles surface modified a few methods of function, resulting in rare earth luminescent nanomaterials with biological molecules coupled difficulties. These factors are to some extent limit the rare earth fluorescence upconversion luminescence nanoparticles as biological fluorescent probes in biological fluorescence and imaging applications. Based on the research background, try to develop rare earth fluorescent upconversion nanoparticles new, effective Synthesis and luminescence properties of the resulting rare earth fluorescence upconversion luminescence nanoparticles; inorganic shell coated and surface oxidation and other ways to explore the rare earth fluorescence upconversion nanoparticles surface modification and functional structure an effective way to reach to obtain a water-soluble and biocompatible, in line with the requirements of the biological fluorescence imaging applications of rare earth fluorescence upconversion nanoparticles . The contents and results are summarized as follows: 1, developed microemulsion - hydrothermal synthesis method to prepare rare earth YVO 4 matrix materials and rare earth Y 0.78 Yb 0.20 Er is 0.02 the VO 4 and Y 0.78 Yb 0.20 of Tm 0.02 VO 4 upconversion luminescence nanoparticles. System by means of X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and fluorescence spectra of the resulting rare earth luminescent nanoparticles size distribution, morphology, microstructure and phase structure and upconversion luminescence properties. Studies have shown that, the prepared Y compared to the solid phase doping method 0.78 Yb 0.20 Er . 0.02 VO 4 and Y 0.78 Yb 0.20 Tm 0.02 VO 4 nanoparticles obtained by microemulsion - hydrothermal weak reunion size smaller, more dispersed tetragonal phase the YVO 4 , Y 0.78 Yb 0.20 Er 0.02 VO 4 and Y 0.78 Yb 0.20 Tm 0.02 in VO 4 nanoparticles, where Y 0.78 Yb of 0.20 Er is 0.02 the VO 4 and Y 0.78 Yb 0.20 Tm 0.02 VO 4 rare earth nanoparticles characteristic upconversion luminescence properties. High temperature liquid phase separation of rare earth trifluoroacetic acid complexes prepared high-quality the rare earth NaY of 0.95 Eu 0.05 F 4 and NaY 0.78, Yb , 0.20 Er is 0.02 F 4 light-emitting nanoparticles, using a unique water / CTAB / n-hexanol / heptane reverse micelle coated media, rare earth NaY with 0.95 Eu 0.05 F 4 and NaY with 0.78 < / sub> Yb 0.20 Er is 0.02 F 4 light-emitting nanoparticles functionalized structure of a surface coating and modified. By controlling the organosilane coverings [tetraethyl orthosilicate (TEOS), 3 - aminoethyl trimethoxy silane (APS)] the amount of a reverse micelle composition and the rare earth concentration of the nanoparticles, the successful realization of the RE NaY with 0.95 Eu 0.05 F 4 and NaY with 0.78 Yb 0.20 ER 0.02 F 4 nanoparticles the surface coating and modification of its surface with amino or carboxyl functional structure of its further coupled with biological molecules conditions; and surface coating and modification of NaY 0.95 Eu 0.05 F 4 and NaY of 0.78 Yb 0.20 Er . 0.02 F 4 nano-particle structure and luminescence properties had no significant effect, rare earth luminescent nanoparticles coated still has the characteristic fluorescence upconversion light-emitting characteristics, can be used as a biological fluorescent probe attempted biological fluorescence and imaging studies.