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A phosphor matrix material and its preparation method

A technology of matrix material and phosphor powder, which is applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of no discovery, and achieve the effects of easy control of crystal shape, low reaction temperature and high phase purity.

Active Publication Date: 2020-08-04
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that the Li ion radius is too small, it is difficult to enter into the crystal lattice to form a bond. So far, no hydrothermal method has been found to successfully prepare LiGd(MoO 4 ) 2 report

Method used

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  • A phosphor matrix material and its preparation method
  • A phosphor matrix material and its preparation method
  • A phosphor matrix material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] LiGd(MoO was prepared by the following steps 4 ) 2 :

[0031] (1) According to LiGd(MoO 4 ) 2 The stoichiometric ratio of Gd and Mo elements in the medium was weighed 3.5mmol of Gd(NO 3 ) 3 ·6H 2 O and 7 mmol Li 2 MoO 4 And ground into powder and dissolved in deionized water to obtain solution A and solution B respectively;

[0032] (2) Slowly drop solution A in step (1) into solution B, and magnetically stir at room temperature for 60 minutes to obtain a mixed milky white solution;

[0033] (3) select LiOH solution to adjust the pH of the mixed milky solution in step (2) to be 7 and add urea, so that the concentration of urea is 0.15mol / L, to obtain the precursor solution;

[0034] (4) Transfer the precursor liquid obtained in step (3) into a p-polyphenylene-lined stainless steel reaction kettle, the volume filling degree of the reaction kettle is 65%, seal and react at 240° C. for 24 hours to form a white precipitate, and cool to room temperature;

[0035] (...

Embodiment 2

[0038] LiGd(MoO was prepared by the following steps 4 ) 2 :

[0039] (1) According to LiGd(MoO 4 ) 2 The stoichiometric ratio of Gd and Mo elements in the medium was weighed 3.5mmol of Gd(NO 3 ) 3 ·6H 2 O and 7 mmol Li 2 MoO 4 And ground into powder and dissolved in deionized water to obtain solution A and solution B respectively;

[0040] (2) Slowly drop solution A obtained in step (1) into solution B, and then magnetically stir at room temperature for 70 minutes to obtain a mixed milky white solution;

[0041] (3) select LiOH solution to adjust the pH of the mixed milky white solution obtained in step (2) to be 8, and add urea, so that the concentration of urea is 0.25mol / L, to obtain the precursor solution;

[0042] (4) Transfer the precursor liquid obtained in step (3) into a p-polyphenylene-lined stainless steel reaction kettle, the volume filling degree of the reaction kettle is 65%, seal and react at 240° C. for 24 hours to form a white precipitate, and cool to...

Embodiment 3

[0046] LiGd(MoO was prepared by the following steps 4 ) 2 :

[0047](1) According to LiGd(MoO 4 ) 2 The stoichiometric ratio of Gd and Mo elements in the medium was weighed 3.5mmol of Gd(NO 3 ) 3 ·6H 2 O and 7 mmol Li 2 MoO 4 And ground into powder and dissolved in deionized water to obtain solution A and solution B respectively;

[0048] (2) Slowly drop solution A obtained in step (1) into solution B and magnetically stir for 80 minutes at room temperature to obtain a mixed milky white solution;

[0049] (3) select LiOH solution to adjust the pH=9 of the mixed opalescent solution obtained in step (2), and add urea so that the concentration of urea is 0.25mol / L to obtain the precursor solution;

[0050] (4) Transfer the precursor liquid obtained in step (3) into a p-polyphenylene-lined stainless steel reaction kettle, the volume filling degree of the reaction kettle is 65%, seal and react at 240° C. for 24 hours to form a white precipitate, and cool to room temperatur...

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Abstract

The invention discloses a phosphor substrate material and a preparation method thereof. The preparation method comprises the following steps of firstly, separately weighing Gd(NO3)3.6H2O and Li2MoO4 according to the stoichiometric proportion of Gd element and Mo element in LiGd(MoO4)2, performing grinding to obtain powder, and enabling the powder to dissolve in deionized water, so as to obtain a solution A and a solution B; dropwise adding the solution A to the solution B, and performing stirring under room temperature to obtain a mixed milky white solution; regulating the mixed milky white solution to be neutral or alkaline, and adding a mineralizer to obtain precursor liquid; enabling the precursor liquid to react at 240 DEG C for 24h to generate white precipitate, and performing coolingto room temperature; then separating the white precipitate, performing washing, performing centrifugation and performing drying to obtain intermediate products; and finally, calcining the intermediate products to obtain the phosphor substrate material. The Gd(NO3)3.6H2O and the Li2MoO4 are selected as raw materials, and the elements of the Gd(NO3)3.6H2O and the Li2MoO4 are basically the same as those of objects. During reaction, impurity ions and other phases are not introduced, and a hydrothermal method has the advantages that the products are good dispersibility, reaction temperature is low, crystal forms are easy to control, and generated phases are high in purity. The blank of preparing luminescent materials using LiGd(MoO4)2 as a substrate by a hydrothermal method is filled.

Description

technical field [0001] The invention belongs to the field of rare earth luminescent materials, and in particular relates to a fluorescent powder matrix material and a preparation method thereof. Background technique [0002] Most phosphors are composed of a matrix and an activator. The matrix is ​​the host compound of the luminescent material, which is acted by a stable crystal with a certain crystal structure. There are many kinds of materials that can be used as phosphor matrix, among which the double molybdate with scheelite structure has attracted extensive attention, and this type of compound has stable physical and chemical properties. [0003] In the large family of double molybdates, LiGd(MoO 4 ) 2 It belongs to the tetragonal phase and has been used as a matrix material for phosphors. Currently preparing LiGd(MoO 4 ) 2 The method is mainly high-temperature solid-phase method. Compared with the high-temperature solid-phase method, the hydrothermal method has t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78
CPCC09K11/7701
Inventor 刘运王蓉王凯刘丁菡白少杰朱毅
Owner SHAANXI UNIV OF SCI & TECH
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