Preparation method of rare earth-doped sodium gadolinium tetrafluoride nanomaterial

Abstract

The invention discloses a method of preparing a rare earth-doped sodium gadolinium tetrafluoride nanomaterial. The method comprises the following steps of: (1) dissolving solid rare earth chloride and sodium oleate in a solvent and performing reflux treatment, separating and collecting the supernatant organic phase, washing with water, and vacuum drying to obtain a rare earth-oleic acid complex compound; (2) adding the rare earth-oleic acid complex compound and sodium oleate into oleic acid and completely dissolving to obtain a rare earth-oleic acid precursor solution; (3) taking out the rare earth-oleic acid precursor solution obtained in the step (2), transferring to the polytetrafluoroethylene inner container of a hydrothermal reaction kettle, and adding butylmethylimidazol tetrafluoroborate to the reaction kettle; and (4) putting the hydrothermal reaction kettle into a muffle furnace, allowing reactions to take place, centrifuging, washing the resulting white solid with distilled water and ethanol in order, and vacuum-drying or freeze-drying, to obtain the rare earth-doped sodium gadolinium tetrafluoride nanomaterial. The method has the advantages of simple process, small number of equipment, low energy consumption and environmental friendliness; and ensures uniform size of the nanomaterial product.

Description

technical field [0001] The invention relates to a preparation method in the technical field of upconversion rare earth fluoride nanomaterials, in particular to a rare earth doped sodium gadolinium tetrafluoride (NaGdF 4 : Yb, Er) nanomaterials preparation method. Background technique [0002] NaGdF 4 :Yb, Er nanomaterials, as a new class of upconversion luminescent materials, have become one of the hotspots of research at home and abroad. NaGdF 4 : Yb, Er nanomaterials have special properties, it can have two emission peaks at 550 nm and 650 nm under the excitation of 980 nm near-infrared excitation light source, and b-NaGdF 4 : Yb, Er up-conversion luminous efficiency is better than a-NaGdF 4 : Yb, Er are at least an order of magnitude higher. And the wavelength and intensity of the generated light can be adjusted by different rare earth doping elements, so it can be applied to up-conversion fluorescence imaging. In addition, due to the existence of Gd element, it can ...

AI Technical Summary

Problems solved by technology

Generally, the small-sized rare earth fluoride nanoparticles produced by hydrothermal solvothermal system are mainly a-crystal form, but the luminescence efficiency of a-crystal form is low

The thermal cracking method can well control the crystal shape and size, and can generate rare earth fluoride up-conversion luminescent nanocrystals with small size (< 50nm) and b crystal form, but the thermal cracking method also has defects, such as trifluoroacetic acid commonly used in this system Salt is highly toxic, and the reaction process needs to be carried out under the conditions of anhydrous, anaerobic and inert gas protection

However, compared with the traditional method, the rare earth fluoride nanoparticles synthesized by the ionic liquid method generally have larger size, wider particle size distribution and poor dispersion.

[0005] Although the above existing methods have successfully synthesized rare earth fluoride upconversion nanomaterials, these existing technologies have their own defects, which largely limit the preparation and subsequent application of rare earth fluoride upconversion luminescent nanomaterials.

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