Rare earth core-shell nano material and preparation method thereof

Abstract

The invention provides a preparation method of a rare earth core-shell nano material. The preparation method comprises the steps: performing first mixing treatment on terbium salt, lutetium salt, alkali and a solvent to form a first solution; carrying out second mixing treatment on the first solution and ammonium fluoride to obtain a second solution; placing the second solution in a hydrothermal kettle for reaction to obtain a rare earth core nano material, wherein the rare earth core nano material comprises nano particles of which the molecular formula is NaLuF4:Tb; carrying out third mixing treatment on yttrium salt, a rare earth core nano material, alkali and a solvent to form a third solution; carrying out fourth mixing treatment on the third solution and ammonium fluoride to obtain a fourth solution; placing the fourth solution in a hydrothermal kettle for reaction to obtain the rare earth core-shell nano material, wherein the rare earth core-shell nano material comprises a shell layer of which the molecular formula is NaYF4. According to the method, the rare earth luminescent nano-material is prepared from a water phase system, the process is simple, and the obtained rare earth core-shell nano-material is regular in morphology, can generate a relatively strong luminescent effect under X-ray excitation, and is favorably applied to biological imaging.

Description

technical field [0001] The present application relates to the field of nanomaterials, in particular to a rare earth core-shell nanomaterial and a preparation method thereof. Background technique [0002] Rare earth luminescent nanomaterials are a type of photoluminescent material that can store excitation energy in the material and release the stored energy in the form of radioluminescence after the excitation light stops irradiating. Rare earth luminescent nanomaterials have many advantages such as narrow emission, long lifetime, and resistance to photobleaching, and have important application values ​​in biomarkers and bioimaging. [0003] At present, the excitation light of rare earth luminescent nanomaterials used for biological imaging is in the infrared band, but infrared light has defects such as poor tissue penetration and poor three-dimensionality, which in turn leads to low luminous efficiency and poor imaging effect of rare earth luminescent nanomaterials. X-rays...

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Problems solved by technology

[0003] At present, the excitation light of rare earth luminescent nanomaterials used for biological imaging is in the infrared band, but infrared light has defects such as poor tissue penetration and poor three-dimensionality, which in turn leads to low luminous efficiency and poor imaging effect of rare earth luminescent nanomaterials.

X-rays have good penetrability to the human body, which is conducive to the application in biological imaging. However, there are few kinds of rare earth luminescent nanomaterials that use X-rays as excitation light to realize biological imaging, and the preparation methods are complicated, and the production cost is high. For a long time, the resulting rare earth luminescent nanomaterials have poor stability, which is not conducive to popularization and use

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