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Preparation method of spherical fluorescent powder

A fluorescent powder and spherical technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of LED chip matching, environmental pollution, and unsatisfactory stability, and achieve the effect of simple preparation method and high color purity

Inactive Publication Date: 2015-05-13
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commercial red powder currently on the market is mainly Y 2 o 3 :Eu 3+ and Y 2 o 2 S:Eu 3+ , mainly matched with high-pressure mercury lamps, not completely matched with LED chips, and contains S element, its stability is not ideal and the production process has certain pollution to the environment

Method used

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  • Preparation method of spherical fluorescent powder
  • Preparation method of spherical fluorescent powder
  • Preparation method of spherical fluorescent powder

Examples

Experimental program
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Effect test

Embodiment 1

[0018] (1) Weigh calcium nitrate and ammonium molybdate tetrahydrate according to the molar ratio of the product molecular formula and dissolve them in appropriate amount of distilled water respectively, then weigh europium trioxide according to the 1% molar ratio of the product and dissolve them with dilute nitric acid, and Heat to remove excess nitric acid, then dissolve with appropriate amount of distilled water.

[0019] (2) Mix the three solutions in step (1), and add ethanol or isopropanol in a proportion of 60% of the volume of the mixed solution, stir vigorously, and then, press dodecyltrimethylammonium bromide (CTAB ) with Ca 2+ The ratio of ions is 0.2:1. Weigh dodecyltrimethylammonium bromide and add it to the above solution, and continue stirring until uniform.

[0020] (3) Transfer the mixture in step (2) into a reaction kettle, and react for 24 hours at 180°C.

[0021] (4) After the reactor is cooled, wash the precipitate three times with distilled water and et...

Embodiment 2

[0023] (1) Weigh calcium nitrate and ammonium molybdate tetrahydrate according to the molar ratio of the product molecular formula and dissolve them in appropriate amount of distilled water, then weigh europium trioxide to dissolve with dilute nitric acid according to the 5% molar ratio of the product, and Heat to remove excess nitric acid, then dissolve with appropriate amount of distilled water.

[0024] (2) Mix the three solutions in step (1), and add ethanol or isopropanol in a proportion of 30% of the volume of the mixed solution, stir vigorously, and then press dodecyltrimethylammonium bromide (CTAB ) with Ca 2+ The ratio of ions is 0.5:1. Weigh dodecyltrimethylammonium bromide and add it to the above solution, and continue stirring until uniform.

[0025] (3) Transfer the mixture in step (2) into a reaction kettle, and react for 12 hours at 190°C.

[0026] (4) After the reactor is cooled, wash the precipitate three times with distilled water and ethanol, and dry the p...

Embodiment 3

[0028] (1) Weigh calcium nitrate and ammonium molybdate tetrahydrate according to the molar ratio of the product molecular formula and dissolve them in appropriate amount of distilled water, then weigh europium trioxide to dissolve with dilute nitric acid according to the 2.5% molar ratio of the product, and Heat to remove excess nitric acid, then dissolve with appropriate amount of distilled water.

[0029] (2) Mix the three solutions in step (1), add ethanol or isopropanol at a ratio of 45% of the volume of the mixed solution, stir vigorously, and then press dodecyltrimethylammonium bromide (CTAB ) with Ca 2+ The ratio of ions is 0.3:1. Weigh dodecyltrimethylammonium bromide and add it to the above solution, and continue stirring until uniform.

[0030] (3) Transfer the mixture in step (2) into a reaction kettle, and react for 20 hours at 170°C.

[0031] (4) After the reactor is cooled, wash the precipitate three times with distilled water and ethanol, and dry the precipit...

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Abstract

The invention discloses a preparation method of spherical fluorescent powder. In the preparation method, by a hydrothermal method in which ethanol / isopropanol is used as a mixed solvent, under the action of a surfactant dodecyltrimethylammonium bromide, and by using ammonium molybdate, calcium nitrate and europium oxide as raw materials, highly-dispersed uniform spherical CaMoO4:Eu3<+> red fluorescent powder particles are prepared. Through regulation and control of alcohol ratio and reaction conditions, morphologies of the particles are controlled. The preparation method is simple in operation; the spherical fluorescent powder prepared by the preparation method has the characteristics of high sample stability, good luminescent monochromaticity and a uniform spherical morphology; the defects that by the conventional method, the particle size is hard to control, agglomeration is easy and particle distribution is non-uniform are overcome; the preparation method has a certain promotional value and a certain practical application value. The spherical fluorescent powder can be effectively excitated by 250-310 nm and 380-400 nm ultraviolet light, and can be used as red fluorescent powder of a UV-LED and the like.

Description

technical field [0001] The invention belongs to the field of material preparation and relates to a preparation method of fluorescent powder. Background technique [0002] As a cold light source, white LED has a series of advantages such as energy saving, small size, long life and no pollution. The ideal way for LED light sources to achieve white light is to emit near-ultraviolet light through the chip and generate red, green, and blue phosphors that can be effectively excited by near-ultraviolet light. The commercial red powder currently on the market is mainly Y 2 o 3 :Eu 3+ and Y 2 o 2 S:Eu 3+ , which is mainly matched with high-pressure mercury lamps, and cannot be completely matched with LED chips, and contains S element, its stability is not ideal and the production process has certain pollution to the environment. [0003] CaO 4 : Eu 3+ It has good chemical stability and thermal stability, and can be effectively excited by near-ultraviolet or blue light to gen...

Claims

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Application Information

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IPC IPC(8): C09K11/68
Inventor 于立新李富海孙家驹魏水林李宋楚
Owner NANCHANG UNIV
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