Zn reinforced rare earth sulfur oxide up-conversion luminescent material and preparation method thereof

Abstract

The invention provides a Zn reinforced rare earth sulfur oxide up-conversion luminescent material and a preparation method thereof. The chemical formula of the material is (Ln1-x-y-zYbxREyZnz)2O2S, wherein the x is greater than or equal to 0.04 and is smaller than or equal to 0.2, the y is greater than or equal to 0.005 and is smaller than or equal to 0.02, the z greater than or equal to 0.005 and is smaller than or equal to 0.02, the Ln is one of La, Y and Gd, and the RE is one of Er, Ho, Tm, Pr, Eu and Tb. The luminous intensity of the material is greatly improved and is improved by 50%-120%. The preparation method of the material adopts a precipitator return-titration method to obtain rare earth oxide raw materials and then adopts a gas sulfidization method, the reaction conditions are simple and easy to control, the method can well keep the morphology and particle size of rare earth oxides, most of the rare earth sulfur oxide up-conversion luminescent materials prepared by means of the method are spherical, uniform in particle size and relatively smaller in particle size distribution range, and D90 is equal to 0.2-0.5 microns.

Description

technical field [0001] The invention relates to the field of fine chemical industry, in particular to a Zn-enhanced rare earth sulfur oxide up-conversion luminescent material and a preparation method. Background technique [0002] In recent years, the improvement of the output power of near-infrared semiconductor laser diodes has provided an effective excitation pump source for up-conversion luminescent materials, and promoted the large-scale development of up-conversion luminescent materials. Infrared detection technology, anti-counterfeiting technology, biomolecular fluorescent labeling and solar cells have been applied in actual or potential fields. The host material is the main component of the up-conversion luminescent material, and its physical and chemical properties largely determine the overall performance of the up-conversion luminescent material. Due to its good thermal and chemical stability, sulfur oxide has a band gap of 4.6-4.8eV, which is suitable for doping...

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide a Zn-enhanced rare earth oxysulfide up-conversion luminescent material to solve the problem of weak luminous intensity of existing rare-earth oxysulfide up-conversion luminescent materials. The Zn-enhanced rare earth oxysulfide Up-conversion luminescent material, because Zn doping optimizes the crystal structure of rare earth oxysulfide, reduces crystal structure symmetry and phonon energy, and greatly enhances luminous intensity by 50% to 120%.

[0006] The second object of the present invention is to provide a preparation method of the Zn-enhanced rare earth oxysulfide up-conversion luminescent material, which uses the method of precipitant reverse dripping to prepare rare earth oxide raw materials, so as to solve the problem of existing purchase of rare earth Oxide raw materials have uneven particle size and serious agglomeration problems. The prepared rare earth oxide raw materials have the advantages of spherical particles, uniform particle size, good dispersion, no need for ball milling, and can be used directly.

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