Preparation And Luminescence Properties Of Dual-mode Excitation Luminescence Rare Earth Fluorescent Pro

In recent years, the nano-science is developing rapidly as a emergingdiscipline. The research that use luminescent nanomaterials as a fluorescentprobe to obtain information on the mass of biological tissue has been widelycarried out. These studies focused on a number of hot issues in a comprehensiveinterdisciplinary research covering biochemistry, information science, materialsscience and biomedical disciplines. Among them, the optimization of the designpreparation and luminescence properties of nanometer luminescent materials isthe focus of our attention. Lanthanide doped rare earth luminescent nanomaterialsshows great potential in fluorescence labeling because of its very unique opticalproperties of biological information in obtaining work.Lanthanide ions doped rare earth luminescent nanomaterials, their narrowspectral line emission spectra, specific, material itself has a stable chemicalproperties, good light stability, and low toxicity. Especially sharp line of light-emitting lanthanide ions is mainly because of they have rich4f electronictransition, both from the ultraviolet to the infrared spectral range. More than tenkinds of lanthanide ion has its own characteristic spectrum, and lanthanide ionselectronic transition was characterized by4f-4f emission peak spectral FWHM of10-20nm, and generally do not move with the matrix changes. This specificitymakes distinctive spectral luminescent lanthanide ions doped rare earthnanomaterials capable encoded as a fluorescent material.Luminous usually have Stokes and anti-Stokes type two kinds, often referredto down-conversion luminescence and upconversion luminescence. Lanthanidecomplexes is an excellent down-conversion light-emitting materials, throughseveral different complexes of rare earth doped to achieve multi-color light, canbe used for spectral coding material. But in the visible range, capable ofefficiently converting luminescence of rare earth ions next few species, usuallyEu3+, Tb3+, Dy3+and Sm3+. Thus limited only by the light-emitting fluorescent lanthanide complexes encoded encoded number. Converting luminescentmaterial and rare earth-energy photons can be converted into a small energyphotons, which can transmit visible light in the near infrared excitation light.The luminescence properties of rare earth materials have access to biologicalinformation as useful as fluorescent marking material. Can effectively avoidbeing labeled biological tissue autofluorescence, which can improve thedetection sensitivity of the fluorescent indicator to obtain information on thebiological tissue and accuracy. But in the upconversion luminescence materialconcentration quenching effect due to the presence difficult by changing theeffective strength grading of rare earth ion concentration level achieved usingonly the upconversion luminescence of rare earth fluorescent coding, there arealso less than the number of coding problems. Converting rare earth doped withdifferent spectral information under the nanocrystals and lanthanide complexesconversion luminescent material in the core-shell nanostructures combiningcoding can effectively increase the number of rare earth nano probe. Therefore,this article will be dual-mode excitation Preparation and research of rare earthfluorescent probes. Specific studies are as follows:(1) The conversion luminescence of rare earth nanomaterials preparation andoptical properties of the multicolor. Prepared by solvent thermal core-shellnanoparticles, and through different locations in the core and shell be sensitizedion concentration and co-doped with luminescent ions to achieve a conversion onmulticolor luminescent nanoparticles. Polyvinyl pyrrolidone used in theexperiment do surfactants, ethylene glycol as a solvent, coating methods usingsynthetic core-shell nanoparticles. By transmission electron microscopy (TEM)imaging, X-ray diffraction (XRD) analysis, luminescence spectroscopy andother means of conversion multicolor luminescent nanoparticles were on themorphology, structure and characterization of upconversion luminescenceproperties. Experimental results show that the size of nano-particles distributeduniformly about20-30nm, good water solubility.980nm excited by infrared light, an aqueous solution of nanoparticles can be observed to transition from redto blue-violet color variable light emitting..Preparation and optical properties of rare earth luminescent nanomaterials (2)dual-mode excitation. By building core-shell structure was prepared in twoexcitation light excitation can be achieved under visible light emitted by thenanoparticles. First, prepare a solvent-thermal method Er, Yb co-doped rareearth nanoparticles NaLuF4of such nanoparticles can be excited by infrared lightemitted on the bright green upconversion luminescence. Then, as a nucleus, byhydrolysis of TEOS, will have a lower conversion luminescence properties ofrare earth complexes Eu (TTA)3Phen shell embedded in SiO2prepared with core-shell structure of dual-mode excitation luminescent nanoparticles. Bytransmission electron microscopy (TEM) imaging, X-ray diffraction (XRD)analysis, and other means of measuring the emission spectrum of the dual-modeexcitation luminescence nanoparticles morphology, structure and luminescenceproperties characterization. Experimental results show that the size ofnano-particles distributed uniformly about30nm, preferably water-soluble. Dual-excitation light-emitting nano-particles emitted in the infrared solution980nmexcitation light, bright green, glow red at365nm UV excitation, resulting in anano-materials to achieve the dual-mode excitation light.