Preparation method of alpha-Sialon fluorescent powder

A technology of alpha-sialon and fluorescent powder, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of low color rendering index, long synthesis time, high temperature reaction, etc., and achieve simple equipment, low cost, and high purity Effect

Inactive Publication Date: 2010-04-28
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the most widely used phosphor powder for white light LED in the world is YAG:Ce phosphor, but this phosphor has the following disadvantages: low color rendering index, high color humidity, serious attenuation, etc.
[0007] Although the above preparation methods can successfully prepare α-sialon phosphors, they all require high temperature reaction, long synthesis time, cumbersome operation and other disadvantages.

Method used

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  • Preparation method of alpha-Sialon fluorescent powder
  • Preparation method of alpha-Sialon fluorescent powder
  • Preparation method of alpha-Sialon fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of Alpha-Sialon fluorescent powder, comprising the steps of:

[0027] m 1 Choose Ca and Mg, Ca:Mg=3:1, M 2 Choose Eu; determine: x=0.7, y=0.2, m=2, n=1, the chemical composition of α-Sialon phosphor is Ca 0.525 Mg 0.175 Eu 0.2 Si 9 al 3 ON 15 ; Select the raw material as: CaCO 3 , MgCO 3 、Eu 2 o 3 , silicon powder, aluminum powder and α-Sialon powder, wherein α-Sialon powder accounts for 15% of the total weight of raw materials; the weight ratio of each raw material is calculated as: CaCO 3 : MgCO 3 :Eu 2 o 3 : Silicon powder: Aluminum powder: α-Sialon = 2.1: 0.7: 1.4: 71.1: 9.7: 15; Weigh each raw material in proportion; put the weighed raw material into a ball mill barrel made of silicon oxide, and put nitrogen Silica grinding balls, the ball-to-material ratio is: 3:1, put in absolute ethanol as the dispersion medium, planetary ball milling for 10 hours, the speed is 120 rpm; take out the obtained slurry, after drying, pass through a...

Embodiment 2

[0029] A preparation method of Alpha-Sialon fluorescent powder, comprising the steps of:

[0030] m 1 Choose as Y, M 2 Choose Eu; determine: x=1, y=0.2, m=3.6, n=1.8, the chemical composition of α-Sialon phosphor is YEu 0.2 Si 6.6 al 5.4 o 1.8 N 14.2 ; Select the raw material as: Y 2 o 3 、Eu 2 o 3 , silicon powder, aluminum powder and α-Sialon powder, wherein α-Sialon powder accounts for 10% of the total weight of raw materials; the weight ratio of each raw material is calculated as: Y 2 o 3 :Eu 2 o 3 : Silicon powder: Aluminum powder: α-Sialon = 21.2: 6.6: 34.8: 27.4: 10; Weigh each raw material in proportion; put the weighed raw material into a ball mill barrel made of silicon oxide, and put it into silicon nitride Grinding balls with a ball-to-material ratio of 3:1, put in absolute ethanol as a dispersion medium, planetary ball milling for 12 hours, and the rotation speed is 100 rpm; the obtained slurry is taken out, dried, and passed through a 200-mesh sieve. ...

Embodiment 3

[0032] A preparation method of Alpha-Sialon fluorescent powder, comprising the steps of:

[0033] m 1 Choices are Ca, Y and Gd, M 2 Choose Eu and Yb; determine: x=1, y=0.2, m=3.6, n=1.8, the chemical composition of α-Sialon phosphor is Ca 0.3 Y 0.4 Gd 0.3 Eu 0.1 Yb 0.1 Si 6.6 al 5.4 o 1.8 N 14.2 ; Select the raw material as: CaCO 3 , Y 2 o 3 、Gd 2 o 3 、Eu 2 o 3 , Yb 2 o 3 , silicon powder, aluminum powder and α-Sialon powder, wherein α-Sialon powder accounts for 20% of the total weight of raw materials; the weight ratio of each raw material is calculated as: CaCO 3 : Y 2 o 3 :Gd 2 o 3 :Eu 2 o 3 :Yb 2 o 3 : silicon powder: aluminum powder: α-Sialon = 4.8: 7.2: 8.7: 2.8: 3.2: 29.8: 23.5: 20; Weigh each raw material in proportion; put the weighed raw material into a ball mill barrel made of silicon oxide , put silicon nitride grinding balls, the ball-to-material ratio is: 3:1, put in absolute ethanol as the dispersion medium, planetary ball mill for 12 ...

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Abstract

The invention provides a preparation method of alpha-Sialon fluorescent powder which is the fluorescent powder for the blue LED and UV LED. The alpha-Sialon fluorescent powder can be expressed by the general formula (M1)x(M2)ySi12-(m+n)Alm+nOnN16-n, wherein M1 is one or more elements of Li, Mg, Ca, Y, Sr and Gd, M2 is one or more elements of Eu, Ce, Pr, Tb, Yb, Dy and Er, 0.3<=x+y<=1.8, 0<=y<=0.7, 0.5<=m<=4.0, 0<=n<=2.5, and x+y=m/(average valence of M1 and M2). The synthesis process of the alpha-Sialon fluorescent powder comprises the following steps: firstly performing ball milling to raw materials, drying, then synthesizing through propagating technology, finally grinding and sorting or directly sorting to obtain the alpha-Sialon fluorescent powder. The preparation method of the invention has simple devices, high efficiency and low cost and the industrial production is easy to realize.

Description

technical field [0001] The invention relates to a preparation method of fluorescent powder, in particular to a preparation method of alpha-Sialon fluorescent powder. Background technique [0002] As a new generation of light source, white LED light source has the advantages of energy saving and high efficiency, and has attracted widespread attention. In white LED lighting technology, the type and preparation of phosphor determine key technical parameters such as luminous spectrum, luminous efficiency, color rendering index, color temperature and service life of white LED. Therefore, phosphor plays an important role in white LED technology. That is to say, the phosphor must have an absorption spectrum and an emission spectrum that match the LED chip, and must have high light conversion efficiency, excellent thermal and chemical stability, low attenuation, and fine and uniform powder particles. [0003] At present, the most widely commercially used phosphor powder for white ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 蒲锡鹏张大凤邵鑫李文智贾丽萍
Owner LIAOCHENG UNIV
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