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A kind of utilizing two-step method to prepare nalamgwo 6 powder method

A technology of powder and steps, 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: 2016-11-16
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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  • A kind of utilizing two-step method to prepare nalamgwo <sub>6</sub> powder method
  • A kind of utilizing two-step method to prepare nalamgwo <sub>6</sub> powder method

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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 two-step method for preparing NaLaMgWO 6 The powder method belongs to the technical field of LED phosphor matrix preparation, and the technical scheme includes: 1) according to NaLaMgWO 6 The stoichiometric ratio of each element in , respectively weighed NaNO 3 , La(NO 3 ) 3 , magnesium acetate and ammonium tungstate, and dissolve them in deionized water, then add citric acid to prepare solution A, and then adjust the pH value of solution A to neutral; 2) put solution A in a hydrothermal reaction kettle Carry out hydrothermal treatment, then take out the sample, centrifuge, wash, and dry to obtain the sample powder; 3) Sinter the sample powder in solid phase to obtain NaLaMgWO 6 Powder. The method of the present invention adopts the cooperation of hydrothermal method and low-temperature solid-phase method to prepare NaLaMgWO with high purity, uniform particle size, good crystallization performance and good dispersion performance. 6 Powder.

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 Patents(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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