Preparation method of rare earth hollow nanocrystal

Abstract

The invention discloses a preparation method of a rare earth hollow nanocrystal, wherein the preparation method comprises the following steps: preparing a rare earth soluble salt aqueous solution of rare earth ions La and Eu; preparing a lithium ion soluble salt aqueous solution; preparing a transparent solution from polyvinylpyrrolidone; dropwise adding the rare earth soluble salt aqueous solution and the lithium ion soluble salt aqueous solution into the obtained solution, to obtain a transparent solution; preparing an NH4F aqueous solution, slowly dropwise adding the NH4F aqueous solution to the obtained solution, to obtain a white colloidal solution; and pouring the obtained colloidal solution into a hydrothermal kettle, centrifuging, putting the obtained white product into a baking oven, and thus obtaining a rare earth hollow nanocrystalline powder. The LaF3:Eu<3+> hollow nanocrystal is formed by using self weight crystallization and localized Ostwald ripening; by doping Li<+> ions, the red luminescence intensity of the nanocrystal is greatly enhanced. The prepared rare earth hollow nanocrystal has the advantages of uniform size, good dispersion, high water solubility and fluorescence intensity and the like, and has highly important research and application significance in the aspects of biological fluorescence imaging, kinetics diagnosis and treatment, photocatalysis and the like.

Description

Technical field [0001] The invention belongs to the technical field of inorganic nano material preparation, and particularly relates to a method for preparing rare earth hollow nanocrystals and fluorescence enhancement Background technique [0002] In recent years, the preparation and application of rare earth-doped nanocrystals has attracted much attention, especially because this nanocrystal has good chemical stability and low toxicity relative to traditional fluorescent dyes and quantum dots, and can be used as a new generation of fluorescent probes. In various biomedical fields. Among them, rare earth porous nanoparticles are a kind of special nanomaterials. They have high specific surface area and permeability. They can combine various hydrophilic molecules, such as some biological macromolecules, organic dyes, drugs or photosensitizers, etc. Loaded into nanocrystalline, that is to say, rare earth hollow nanocrystalline can be used as an ideal drug carrier, so it has import...

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Problems solved by technology

[0004] The luminous efficiency of rare earth nanocrystals is generally low, and by doping Li + There is no report on how ions enhance the fluorescence intensity of rare earth hollow lanthanum fluoride nanocrystals

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