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Method for preparing NaLaMgWO6 powder by using two-step method

A powder and step technology, applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of reduced luminous efficiency of phosphors, difficulty in obtaining spherical particles, uneven particle size distribution, etc., and achieve good crystallization performance. , Small particle size, good dispersion effect

Active Publication Date: 2014-12-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the solid-phase method is mostly used to prepare phosphors, and the common problems are: high sintering temperature, large particle size, uneven particle size distribution, difficulty in obtaining spherical particles, and easy existence of impurity phases, thereby reducing the luminous efficiency of phosphors.

Method used

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  • Method for preparing NaLaMgWO6 powder by using two-step method
  • Method for preparing NaLaMgWO6 powder by using two-step method

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Experimental program
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Effect test

Embodiment 1

[0032] A two-step method to prepare NaLaMgWO 6 The method of powder, comprises the following steps:

[0033] 1) According to the stoichiometric ratio, weigh and synthesize 0.02mol of NaLaMgWO 6 required NaNO 3 , La(NO 3 ) 3 , magnesium acetate (C 4 h 6 MgO 4 ), ammonium tungstate ((NH 4 ) 10 W 12 o 41 ), and be dissolved in deionized water (the quality of deionized water is 4 times of the total mass of raw materials required), and add 0.004mol of citric acid (C 6 h 8 o 7 ), was prepared into solution A;

[0034] 2) Add HNO dropwise to solution A 3 Carry out pH adjustment, adjust pH to 7;

[0035] 3) After the pH adjustment, the solution A was placed in a hydrothermal kettle for hydrothermal treatment. The hydrothermal treatment temperature was 180° C., the hydrothermal treatment time was 12 hours, and the filling degree of the hydrothermal kettle reaction was 80%;

[0036] 4) After the hydrothermal treatment is completed, the sample in the hydrothermal kettle i...

Embodiment 2

[0040] A two-step method to prepare NaLaMgWO 6 The method of powder, comprises the following steps:

[0041] 1) According to the stoichiometric ratio, weigh and synthesize 0.02mol of NaLaMgWO 6 required NaNO 3 , La(NO 3 ) 3 , magnesium acetate (C 4 h 6 MgO 4 ), ammonium tungstate ((NH 4 ) 10 W 12 o 41 ), and be dissolved in deionized water (the quality of deionized water is 5 times of the total mass of raw materials required), and add 0.002mol of citric acid (C 6 h 8 o 7 ), was prepared into solution A;

[0042] 2) Add HNO dropwise to solution A 3 Carry out pH adjustment, adjust pH to 8;

[0043] 3) After the pH adjustment, the solution A was placed in a hydrothermal kettle for hydrothermal treatment. The hydrothermal treatment temperature was 165° C., the hydrothermal treatment time was 18 hours, and the filling degree of the hydrothermal kettle reaction was 70%;

[0044] 4) After the hydrothermal treatment is completed, the sample in the hydrothermal kettle i...

Embodiment 3

[0048] A two-step method to prepare NaLaMgWO 6 The method of powder, comprises the following steps:

[0049] 1) According to the stoichiometric ratio, weigh and synthesize 0.02mol of NaLaMgWO 6 required NaNO 3 , La(NO 3 ) 3 , magnesium acetate (C 4 h 6 MgO 4 ), ammonium tungstate ((NH 4 ) 10 W 12 o 41 ), and be dissolved in deionized water (the quality of deionized water is 3 times of the total mass of raw materials required), and add 0.001mol of citric acid (C 6 h 8 o 7 ), was prepared into solution A;

[0050] 2) Add HNO dropwise to solution A 3 Carry out pH adjustment, adjust pH to 6;

[0051] 3) After the pH adjustment, the solution A was placed in a hydrothermal kettle for hydrothermal treatment. The hydrothermal treatment temperature was 150° C., the hydrothermal treatment time was 20 hours, and the filling degree of the hydrothermal kettle reaction was 60%;

[0052] 4) After the hydrothermal treatment is completed, the sample in the hydrothermal kettle i...

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Abstract

The invention discloses a method for preparing NaLaMgWO6 powder by using a two-step method and belongs to the technical field of preparation of LED (light-emitting diode) fluorescent powder matrixes. The technical scheme comprises the following steps: 1) respectively weighing NaNO3, La(NO3)3, magnesium acetate and ammonium tungstate according to stoichiometric ratios of all elements in NaLaMgWO6, dissolving into deionized water, then adding citric acid, preparing a solution A, and then regulating the pH value of the solution A to neutral; 2) putting the solution A into a hydrothermal reaction kettle to perform hydrothermal treatment, taking out a sample, and performing centrifugation, washing and drying to obtain sample powder; 3) performing solid-phase sintering on the sample powder to obtain the NaLaMgWO6 powder. By adopting the method disclosed by the invention, the NaLaMgWO6 powder with high purity, uniform particle size, good crystallization performance and good dispersion performance can be prepared by mutual matching of a hydrothermal method and a low-temperature solid phase method.

Description

technical field [0001] The invention belongs to the technical field of LED phosphor matrix preparation, and relates to a method for preparing phosphor matrix powder by using a hydrothermal method and a low-temperature solid-phase method, in particular to a method for preparing NaLaMgWO by using a two-step method 6 powder method. Background technique [0002] LED has a series of advantages such as low working voltage, low power consumption, high reliability, long service life, environmental friendliness and high energy efficiency, and is the development direction of future lighting sources. There are three main methods of using LED technology to realize white light: the direct color mixing method of three-color LEDs, the ultraviolet conversion method, and the method of adding yellow phosphor powder to blue light chips. Visible phosphor plays an important role in the field of LED lighting. To obtain an excellent phosphor, it is very important to select a suitable substrate a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00C09K11/08
Inventor 宁青菊刘波李向龙史永胜曹舒尧
Owner SHAANXI UNIV OF SCI & TECH
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