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 following steps: performing first mixing treatment on terbium salt, lutetium salt and a solvent to form a first solution; carrying out second mixing treatment on the first solution, ammonium fluoride and alkali to obtain the rare earth core nano material, wherein the second mixing treatment comprises ultrasonic mixing; the rare earth core nano material comprises beta-NaLuF4: Tb; performing third mixing treatment on yttrium salt, a rare earth core nano material and a solvent to form a second solution; performing fourth mixing treatment on the second solution, ammonium fluoride and alkali to obtain a rare earth core-shell nano material; the fourth mixing treatment comprises ultrasonic mixing; the shell layer of the rare earth core-shell nano material comprises NaYF4. The method is simple in process, low in cost and beneficial to large-scale production. The invention further provides the rare earth core-shell nanometer material, the rare earth core-shell nanometer material is regular in morphology and uniform in granularity, a strong light-emitting effect can be generated under X-ray excitation, and application of the rare earth core-shell nanometer material to biological imaging is facilitated.

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 have many advantages such as narrow emission spectrum, high color purity, long fluorescence lifetime, and good luminescence stability, and have important application value in biomarkers and bioimaging. 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 ligh...

AI Technical Summary

Problems solved by technology

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 dispersion and unstable luminescent performance, which is not conducive to popularization and use.

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