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A kind of preparation method of yttrium aluminum garnet nanometer yellow fluorescent material

A technology of yttrium aluminum garnet and fluorescent materials, which is applied in the field of nano-rare earth aluminate fluorescent materials, can solve the problems of poor dispersion of nano-YAG particles, high requirements for reaction vessels, and uneven product sizes, and achieve optical and Stable thermodynamic properties, shortened reaction time, and easy long-term storage

Inactive Publication Date: 2014-10-29
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of YAG by sol-gel method, combustion method, co-precipitation and other methods has uneven size, severe agglomeration and large particle size, which cannot be applied in some special fields, such as nanomaterials for optical films. Must be within 50nm to have good film-forming properties
When the existing solvothermal method is used to prepare nano-yttrium aluminum garnet, the reaction temperature is 300°C, and the reaction time is as long as 7 to 14 days. A stirrable reactor is required, and the requirements for the reaction vessel are relatively high, and the preparation cost is relatively high. , and the dispersion of the prepared nano-YAG particles is not the best, and the particle size is too large

Method used

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  • A kind of preparation method of yttrium aluminum garnet nanometer yellow fluorescent material
  • A kind of preparation method of yttrium aluminum garnet nanometer yellow fluorescent material
  • A kind of preparation method of yttrium aluminum garnet nanometer yellow fluorescent material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Weigh 0.5400g (1.41mmol) Y (NO 3 ) 3 ·6H 2 O, 0.9378g (2.5mmol) Al(NO 3 ) 3 9H 2 O and 0.0398g (0.09mmol) Ce(NO 3 ) 3 ·6H 2 O into the beaker; add 20mL of polyethylene glycol 200 into the beaker, stir and heat to 50°C, keep it for 30min and cool to room temperature, then slowly add 20mL of anhydrous ethylenediamine dropwise, continue to stir after the dropwise addition, and heat to 70°C and keep it for 6 hours; pour the reaction mixture into a 50mL polytetrafluoroethylene-lined single chamber, the volume of the reaction mixture is 70% of the volume of the polytetrafluoroethylene-lined single chamber; then pour the polytetrafluoroethylene Put the ethylene liner into a stainless steel hydrothermal reaction kettle, put it into an oven for hydrothermal reaction, the reaction temperature is 250°C, and the reaction time is 24 hours to obtain a precipitate; the precipitate is washed alternately with absolute ethanol and distilled water for 5 times, and then dry the was...

Embodiment 2

[0032] The preparation method and the amount of raw materials added are the same as in Example 1, except that the prepared nano-fluorescent material is put into a small corundum crucible, and then the small corundum crucible is put into a large corundum crucible equipped with high-purity graphite blocks Then put it into a muffle furnace for sintering, the sintering temperature is 600°C, and the reaction time is 2 hours.

[0033] The nano fluorescent material prepared in Example 1 is sintered by high temperature curing method, the main purpose is to provide a weak reducing atmosphere to prevent Ce 3+ It is oxidized to remove the unwashed organic matter on the surface of the nano-fluorescent material to increase the fluorescence intensity of the nano-fluorescent material.

[0034] Figure 4 The b spectrum in the figure is the fluorescence emission spectrum diagram obtained under the excitation of 460nm for the nano-fluorescent material prepared in this example. It can be seen f...

Embodiment 3

[0036] The preparation method and the amount of raw materials added are the same as in Example 2, except that the sintering temperature of the prepared nano-fluorescent material is 800° C., and the reaction time is 2 hours.

[0037] Figure 4 The spectrum c in the figure is the fluorescence emission spectrum of the nano-fluorescent material prepared in this example under 460nm excitation.

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Abstract

The invention belongs to the technical field of nano rare earth aluminate fluorescent material, in particular relates to a yttrium aluminum garnet nano yellow fluorescent material and a preparation method thereof. The chemical formula of the fluorescent material is Y3-xAl5O12:xCe<3+>, wherein 0.01<=x<=0.2. The preparation method comprises the following steps: adding polyethylene glycol into a mixture of a yttrium salt, an aluminum salt and a cerium salt, stirring up and heating the above mixture to 30-70 DEG C for 0.1-1.2 hours, adding anhydrous ethylenediamine after cooling the mixture, stirring up and heating the reaction mixture solution again to 50-90 DEG C for 4-8 hours; reacting the reaction mixture solution at 200-300 DEG C for 20-30 hours, so as to obtain precipitates; centrifugally washing and drying the precipitates to obtain target products. The fluorescent nano material is produced by one-step solvent thermal method, the synthesis temperature is low, the reaction time is short, and moreover the fluorescent material has a uniform particle size, good dispersion and chemical stability, and can be stored for a long time.

Description

technical field [0001] The invention belongs to the technical field of nano-rare-earth aluminate fluorescent materials, in particular to a yttrium-aluminum-garnet nano-yellow fluorescent material and a preparation method thereof. Background technique [0002] Yttrium aluminum garnet (YAG), chemical formula Y 3 al 5 o 12 , has excellent physical and chemical stability, high emission intensity, quantum yield and stable color coordinates, optical isotropy, no birefringence effect, high-intensity radiation and electron bombardment resistance, etc., so it is widely used as a luminescent The matrix material of the material. White LED technology is of great significance for rational utilization of energy, alleviation of energy crisis and green lighting. The realization method of white light LED is usually that high-efficiency InGaN / GaN blue light grains are coated with a layer of YAG fluorescent material, and the fluorescent material is irradiated with blue light LED to produce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80
Inventor 余锡宾刘浦俊罗宏德刘洁
Owner SHANGHAI NORMAL UNIVERSITY