Preparation method of rare earth-doped gadolinium oxysulfide and gadolinium oxysulfate up-conversion phosphor

Abstract

A method for preparing rare earth-doped gadolinium oxysulfide and oxygen-containing gadolinium sulfate upconversion phosphor, belonging to the field of material science. The method includes the following steps: (1) Mix Gd(NO3)3·6H2O, Yb(NO3)3·6H2O and Ln(NO3)3·6H2O, add deionized water to obtain RE(NO3)3 solution; (2) ) Dissolve ammonium sulfate in the RE(NO3)3 solution and stir, continue stirring, add ammonia water, adjust the pH value, and obtain a suspension; (3) Hydrothermally react the suspension at 100 to 150°C for 1 to 72 hours , naturally cooled to room temperature to obtain the reaction product; (4) Centrifuge, clean, and dry the reaction product to obtain a white powder precursor; (5) Calculate the white powder precursor to obtain rare earth ion-doped Gd2O2S or Gd2O2SO4 upconversion phosphor. This method effectively solves the use of sulfur-containing raw materials and the discharge of harmful by-products in conventional methods, and is a green and environmentally friendly preparation technology.

Description

technical field [0001] The invention belongs to the field of material science, and particularly relates to a preparation method of rare earth-doped gadolinium oxysulfide and oxysulfate-containing gadolinium up-conversion fluorescent powder. Background technique [0002] Upconversion luminescent materials are widely used in upconversion lasers, dye-sensitized solar cells, drug delivery, bioluminescence labeling, and infrared anti-counterfeiting due to their unique ability to convert long-wave radiation into short-wave radiation. The current high-efficiency upconversion system is fluoride (such as NaYF 4 : Yb / Er), fluoride has the advantages of low phonon energy and high upconversion efficiency. However, fluoride raw materials are highly toxic, which greatly limits the large-scale production and practical application of fluoride upconversion luminescent materials. Although the rare earth oxide upconversion system is non-toxic, the phonon energy is high and the upconversion e...

AI Technical Summary

Problems solved by technology

[0005] For the existing preparation of rare earth doped Gd 2 o 2 The problem of using environmentally harmful sulfur-containing raw materials in the S technical route, the present invention provides a preparation method of rare earth-doped gadolinium oxysulfide up-conversion phosphor, the preparation method adopts a hydrothermal method to prepare rare earth-doped Gd 2 (OH) 4 SO 4 ·nH 2 O and Gd 2 (OH) 4 SO 4 Two types of precursors, and using the molar ratio of RE / S in the two types of precursors and the RE 2 o 2 The completely consistent characteristics in S, calcining the two types of compounds in a reducing atmosphere, the green preparation of rare earth doped Gd 2 o 2 S

This method effectively solves the problem of the use of environmentally harmful sulfur-containing raw materials and the discharge of harmful by-products in conventional methods, and is a green and environmentally friendly preparation technology

[0006] For the existing preparation of rare earth doped Gd 2 o 2 SO 4 In the technical route, there is a problem that the green preparation cannot be realized and the effective control of its morphology can be achieved. The present invention provides a preparation method of rare earth-doped gadolinium oxysulfate up-conversion phosphor. The method is prepared by hydrothermal method rare earth doped Gd 2 (OH) 4 SO 4 ·nH 2 O, rare earth-doped Gd with uniform agglomerated spheres achieved by calcining the compound in air 2 o 2 SO 4 preparation, and provide a quasi-hexagonal micro-plate rare earth-doped sulfate-type rare earth layered hydroxide Gd 2 (OH) 4 SO 4 The hydrothermal preparation method, the compound is calcined in the air to prepare the rare earth-doped Gd of the quasi-hexagonal micron plate 2 o 2 SO 4

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