Preparation method of rare earth-doped fluoride up-conversion luminescent nano dispersion

Abstract

The invention discloses a preparation method of a rare earth-doped fluoride up-conversion luminescent nano dispersion, belongs to the cross fields of chemical engineering, materials and photonics, andrelates to a method for preparing the rare earth-doped fluoride up-conversion luminescent nano dispersion by utilizing a super-gravity reaction intensifying technology, i.e. a rotating packed bed reactor. Raw materials and reagents required for realizing the synthetic method of the rare earth-doped fluoride up-conversion luminescent nano dispersion comprise rare earth chlorate, sodium hydroxide,ammonium fluoride, a surfactant, deionized water and absolute ethanol, wherein the rare earth chlorate comprises yttrium chloride, ytterbium chloride and erbium chloride; the surfactant is respectively prepared from oleic acid, oleylamine and sodium citrate; a dispersion solvent is prepared from ethanol, tetrahydrofuran, cyclohexane, chloroform and toluene. According to the preparation method disclosed by the invention, the rotating packed bed reactor is introduced for premixing a reaction precursor solution, and molecular uniform mixing is realized, so that the rare earth-doped fluoride up-conversion luminescent nano dispersion which is small in particle size and narrow in particle size distribution is synthesized.

Description

technical field [0001] The invention belongs to the cross fields of chemical industry, material and photonics, and in particular relates to a method for up-converting luminescent nano-dispersion with rare earth-doped fluoride by using the supergravity technology. Background technique [0002] The up-conversion luminescent material is a luminescent material that excites visible light by near-infrared light, and is a luminescent material based on the anti-Stokes principle. At present, upconversion luminescent materials have been widely used in bioluminescent imaging, three-dimensional display and anti-counterfeiting. Up-conversion luminescent materials are usually composed of two parts: crystal host material and doped rare earth ions. The matrix materials are fluorides (complex fluorides), rare earth oxides (composite oxides), oxyfluorides, halides (oxyhalides), and sulfur-containing compounds. Among them, fluoride and halide (oxyhalide) have lower phonon energy and higher u...

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Problems solved by technology

Compared with the hydrothermal / solvothermal method, the first three methods require a higher reaction temperature. In addition, the preparation process of the thermal decomposition method is sensitive to air, requiring an inert gas as a protective gas, and the synthesis cost is relatively high. ;The preparation process of high-temperature solid-phase method requires high-temperature and high-pressure treatment of raw materials, which is not conducive to mass production

The equipment and conditions of the hydrothermal / solvothermal method are simple, and the synthesis process is easy to operate. It is the most common method for preparing nanomaterials. However, the shape of the sample synthesized by this method is difficult to control. Therefore, based on the simple method of hydrothermal / solvothermal method, the proposed A method that can overcome the shortcomings of uncontrollable product morphology and uneven particle size distribution is very important

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