A kind of fluorosilicate red fluorescent powder and preparation method thereof

A red phosphor, fluorosilicate technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., to achieve the effects of strong thermal stability, low temperature, and simple steps

Inactive Publication Date: 2016-04-27
LIAOCHENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the reported apatite-structure fluorosilicate phosphors all contain alkali metal ions, but apatite-type fluorosilicates without alkali metal ions have not been reported, because apatite silicate The structure is a metastable structure, which is easily decomposed into other structural silicates at high temperature, and can be stabilized by adding alkali metal ions (Solid State Sciences3 (2001) 495-502.)

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  • A kind of fluorosilicate red fluorescent powder and preparation method thereof
  • A kind of fluorosilicate red fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Preparation of Fluorosilicate Red Phosphor Powder Y 3.5 Eu 0.83 (SiO 4 ) 3 f

[0027] (1) Weigh 0.0175 mol of yttrium nitrate and 0.00415 mol of europium nitrate, and dissolve them in deionized water; weigh 0.01 mol of citric acid and 0.0075 mol of ammonium fluoride, respectively, and dissolve them in the above solution.

[0028] (2) Weigh 0.015mol tetraethyl orthosilicate according to the stoichiometric ratio, dissolve it in the solution obtained in (1), and then place it on a magnetic stirrer for heating and stirring; with the evaporation of water, a colloidal precursor is obtained; further heating The precursor burns with a lot of smoke, and after the reaction stops, a fluffy powder is obtained.

[0029] (3) After grinding the obtained powder, calcining in air atmosphere, the calcining temperature is 1100° C., and the calcining time is 2 hours to obtain a fluorosilicate red phosphor.

[0030] prepared Y 3.5 Eu 0.83 (SiO 4 ) 3 The X-ray diffraction ...

Embodiment 2

[0031] Example 2 Preparation of Fluorosilicate Red Phosphor Powder Y 4.325 Eu 0.005 (SiO 4 ) 3 f

[0032] (1) Weigh 0.02162 mol of yttrium nitrate and 0.005 mol of europium nitrate, and dissolve them in deionized water; weigh 0.005 mol of citric acid and 0.01 mol of ammonium fluoride, respectively, and dissolve them in the above solutions.

[0033] (2) Weigh 0.015mol tetraethyl orthosilicate according to the stoichiometric ratio, dissolve it in the solution obtained in (1), and then place it on a magnetic stirrer for heating and stirring; with the evaporation of water, a colloidal precursor is obtained; further heating The precursor burns with a lot of smoke, and after the reaction stops, a fluffy powder is obtained.

[0034] (3) After grinding the obtained powder, calcining in air atmosphere, the calcining temperature is 900° C., and the calcining time is 1 hour to obtain a fluorosilicate red phosphor.

Embodiment 3

[0035] Example 3 Preparation of Fluorosilicate Red Phosphor Powder Y 3.13 Eu 1.2 (SiO 4 ) 3 f

[0036] (1) Weigh 0.01565 mol of yttrium nitrate and 0.006 mol of europium nitrate, and dissolve them in deionized water; weigh 0.015 mol of citric acid and 0.005 mol of ammonium fluoride, respectively, and dissolve them in the above solutions.

[0037] (2) Weigh 0.015mol tetraethyl orthosilicate according to the stoichiometric ratio, dissolve it in the solution obtained in (1), and then place it on a magnetic stirrer for heating and stirring; with the evaporation of water, a colloidal precursor is obtained; further heating The precursor burns with a lot of smoke, and after the reaction stops, a fluffy powder is obtained.

[0038] (3) After grinding the obtained powder, calcining in air atmosphere, the calcining temperature is 1000° C., and the calcining time is 5 hours to obtain a fluorosilicate red phosphor.

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Abstract

The invention discloses a fluorosilicate red fluorescent powder and a preparation method thereof, belonging to the technical field of inorganic luminescent materials. The chemical formula of the fluorescent powder is: Y4.33-xEux(SiO4)3F, where 0.005<x≤1.2. Prepared by a low-temperature synthesis method. It has a wavelength of 350-420? Under the excitation of near-ultraviolet light of nm, it emits bright red light, has high luminous intensity and good stability, and can be used as a phosphor powder for white LEDs excited by near-ultraviolet light. The phosphor powder preparation method adopted in the present invention has the advantages of low temperature, short preparation time, simple steps and the like.

Description

technical field [0001] The invention relates to a fluorescent powder and a preparation method thereof, in particular to a fluorosilicate red fluorescent powder suitable for LEDs and a preparation method thereof, and belongs to the technical field of rare earth luminescent materials. Background technique [0002] In the 1990s, with the technological breakthrough of high-brightness GaN blue LEDs, in 1996, blue LEDs and YAG phosphors (Y, Gd) appeared. 3 al 5 o 12 : Ce 3+ ) A combination of white LEDs. As a new type of green lighting product, white LED has the advantages of energy saving, high efficiency, long life and small size, and has been widely used. At present, commercialized white LEDs are mainly composed of blue LED chips and yellow light from YAG phosphors. However, due to the lack of red light radiation, the products have disadvantages such as low color rendering index and poor color reproduction, which limit their use. Large-scale application and promotion in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/86H01L33/50
Inventor 蒲锡鹏张大凤李怀勇陈辉
Owner LIAOCHENG UNIV
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