Method for preparing YAG-Ce phosphor by using combustion method

A fluorescent powder and combustion method technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, nano optics, etc., can solve problems such as toxicity and difficulty in complete combustion, and achieve lower reaction synthesis temperature and uniform distribution , The effect of simple preparation process

Inactive Publication Date: 2015-09-09
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The combustion agent alcohol used in this process is ethylene glycol, which is not easy to burn

Method used

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  • Method for preparing YAG-Ce phosphor by using combustion method
  • Method for preparing YAG-Ce phosphor by using combustion method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

[0028] (1) First weigh 6.667g aluminum chloride, 8.949g yttrium chloride, and 0.186g cerium chloride. The amount is controlled by the molar ratio: Y:Al:Ce=3:5:0.05, and the above mixed salt is 1.5 times the weight That is, 23.703g of LiCl is mixed and placed in a ceramic crucible, and an appropriate amount of distilled water is added. The crucible is placed in a water bath while stirring and heated to 80°C;

[0029] (2) Add 15.802g starch as a combustion agent to the crucible, continue to stir until it is uniform, heat it in a muffle furnace to 300°C for 3 hours, and then calcinate the resulting sol at 800°C for 3 hours. Take out after hours;

[0030] (3) Wash with water to remove LiCl from the precursor body until the conductivity of the residual solution obtained by washing the phosphor is 12ps / cm and the pH is 7.0; after washing, filter with suction and dry for 12h in a drying oven at 80℃;

[0031] (4) Grind the dried precursor powder and place it in a reducing ...

Example Embodiment

[0033] Example 2

[0034] (1) First weigh 6.667g aluminum chloride, 8.888g yttrium chloride, and 0.260g cerium chloride. The dosage control molar ratio is: Y:Al:Ce=3:5:0.07; the above mixed salt and 31.63g Place the LiCl mixture in a ceramic crucible, add an appropriate amount of distilled water, and heat the crucible to 80°C while stirring in a water bath;

[0035] (2) Add 15.82g of starch to the crucible, continue to stir until uniform, heat it in a muffle furnace to 300°C for 3 hours, and then calcinate the resulting sol at 800°C for 3 hours before taking it out;

[0036] (3) Wash with dilute hydrochloric acid to remove LiCl from the precursor until the conductivity of the washing solution obtained by washing the phosphor is 8 ps / cm and the pH is 6.9, the washing is finished, suction filtration, and placed in a drying cabinet at 80°C Dry for 12h;

[0037] (4) Grind the dried precursor powder and place it in a reducing atmosphere with a volume of hydrogen and nitrogen of 1:9, calci...

Example Embodiment

[0038] Example 3

[0039] (1) First weigh 6.667g aluminum chloride, 9.009g yttrium chloride, and 0.111g cerium chloride. The dosage control molar ratio is: Y:Al:Ce=3:5:0.03, and the above mixed salt is mixed with 63.148g LiCl is mixed and placed in a ceramic crucible, and an appropriate amount of distilled water is added. The crucible is placed in a water bath while stirring and heated to 80°C;

[0040] (2) Add 15.787g starch as a combustion agent to the crucible, continue to stir until uniform, heat it in a muffle furnace to 300℃ for 3 hours, and then calcinate the resulting sol at 800℃ for 3 hours Take out

[0041] (3) Wash with water to remove LiCl from the precursor until the conductivity of the residual solution obtained by washing the phosphor is 13 ps / cm and the pH is 7.1, the washing is completed, suction filtration, and drying in a drying oven at 80°C for 12 hours;

[0042] (4) Grind the dried precursor powder and place it in a reducing atmosphere with a volume of hydrogen a...

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Abstract

The invention relates to a method for preparing YAG-Ce phosphor by using a combustion method. The method comprises: weighing a cosolvent, a combustion agent, and raw materials for preparing YAG-Ce phosphor; dissolving the raw materials in water; heating to a temperature of 80 DEG C, heating to a temperature of 300 DEG C by using a muffle furnace, carrying out thermal insulation for 3-6 h, carrying out calcining thermal insulation for 3-6 h at a temperature of 800 DEG C, and carrying out water washing or acid washing, suction filtration and drying; and placing the dried precursor under a reducing atmosphere, carrying out calcining thermal insulation for 3-6 h at a temperature of 900-1400 DEG C, cooling, taking out, and screening so as to obtained the required phosphor. According to the present invention, the starch or cellulose powder is adopted as the combustion agent, the combustion method is used to manufacture the YAG-Ce phosphor, the reaction temperature is lowered to about 900 DEG C from the traditional 1400-1700 DEG C, the obtained reaction product has characteristics of regular morphology and good uniformity, the method has characteristics of low temperature synthesis, simple process, low energy consumption, low equipment requirements and the like, and the phosphor has good light-emission intensity and is used for white light LED light source.

Description

technical field [0001] The invention relates to the field of preparation of fluorescent powder, in particular to a method for preparing fluorescent powder by a combustion method. Background technique [0002] White light emitting diodes (light emitting diodes, LEDs) have attracted people's attention and are used in various lighting devices, such as indicator lights, vehicle tail lights, decorative lights, liquid crystal display devices, and backlight sources. It has many advantages such as high efficiency, long life, energy saving and environmental protection, and has broad application prospects. [0003] At present, the common way to achieve white LEDs is to mix blue LED chips and yellow powder to form white LEDs. The principle is that blue LEDs excite phosphors to produce yellow light that is complementary to blue light. Mixing blue light and yellow light will make the human eye produce white light vision. This phosphor is mainly yttrium aluminum garnet (YAG-Ce) acti...

Claims

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Application Information

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IPC IPC(8): C09K11/80B82Y20/00B82Y30/00B82Y40/00
Inventor 王仲民朱加明
Owner GUILIN UNIV OF ELECTRONIC TECH
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