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Silica-coated orange-red phosphor and preparation method thereof

A silicon dioxide and phosphor technology, applied in the field of orange-red phosphor and its preparation, can solve problems such as easy failure, and achieve the effects of improving color rendering, enhancing stability and reducing synthesis temperature

Inactive Publication Date: 2014-12-31
BEIJING JINGCHUANGDA SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above documents, silicate is used as the phosphor material, but since the silicate itself is unstable to acid and water, the use of silicate in LEDs, such as when using acidic silicone adhesives during packaging, or Prone to failure when used in high humidity conditions

Method used

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  • Silica-coated orange-red phosphor and preparation method thereof
  • Silica-coated orange-red phosphor and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The chemical structural formula (Ba 0.04 Sr 0.94 ) 3 SiO 5 : Eu 0.06 SiO 2 , weigh high-purity SrCO 3 (41.63 g), BaCO 3 (2.37 g), SiO 2 (6.01 g), EuF 3 (1.25 g), and the reaction flux CaF 2(0.04 grams). The above mixture was put into a high-energy ball mill and pulverized and mixed for 40 minutes. After sieving, the mixed raw materials were put into a high-purity alumina crucible, and in a reducing atmosphere (5% H 2 / N 2 gas), keep it at 1000 degrees for 2 hours, then raise the temperature to 1250 degrees for 5 hours. Cool naturally to room temperature, take it out, and carry out post-treatment after sieving to remove superfine powder (<2 μm), and obtain the uncoated phosphor material of the present invention.

[0040] The uncoated fluorescent powder prepared above was evenly dispersed in anhydrous ethylene glycol to prepare a fluorescent powder suspension with a concentration of 5%. Add nano-SiO to this suspension 2 , the SiO used 2 The dosage is 2.5% o...

Embodiment 2

[0042] According to the chemical structural formula (Ba 0.05 Sr 0.925 ) 3 SiO 5 : Eu 0.07 SiO 2 , weigh high-purity SrCO 3 (40.97 g), BaCO 3 (2.96 g), SiO 2 (6.01 g), EuF 3 (1.46 g), and the reaction flux CaF 2 (0.33 grams). The above mixture was put into a high-energy ball mill and pulverized and mixed for 40 minutes. After sieving, the mixed raw materials were put into a high-purity alumina crucible, and in a reducing atmosphere (5% H 2 / N 2 Gas), keep warm at 1300 degrees for 2 hours, then raise the temperature to 1250 degrees and keep warm for 5 hours. Cool naturally to room temperature, take it out, and carry out post-treatment after sieving to remove superfine powder (<2 μm), and obtain the uncoated phosphor material of the present invention.

[0043] The uncoated fluorescent powder prepared above was evenly dispersed in anhydrous ethylene glycol to prepare a fluorescent powder suspension with a concentration of 5%. Add nano-SiO to this suspension 2 , the S...

Embodiment 3

[0045] According to the chemical structural formula (Ba 0.05 Sr 0.925 ) 3 Si 1.1 o 5 : Eu 0.07 SiO 2 , weigh high-purity SrCO 3 (40.97 g), BaCO 3 (2.96 g), SiO 2 (6.61 g), EuF 3 (1.46 g), and the reaction flux CaF 2 (0.33 grams). The above mixture was put into a high-energy ball mill and pulverized and mixed for 40 minutes. After sieving, the mixed raw materials were put into a high-purity alumina crucible, and in a reducing atmosphere (5% H 2 / N 2 Gas), keep at 1000 degrees for 12 hours, then raise the temperature to 1250 degrees for 5 hours. Cool naturally to room temperature, take it out, and carry out post-treatment after sieving to remove superfine powder (<2 μm), and obtain the uncoated phosphor material of the present invention.

[0046] The uncoated fluorescent powder prepared above was evenly dispersed in anhydrous ethylene glycol to prepare a fluorescent powder suspension with a concentration of 5%. Add nano-SiO to this suspension 2 , the SiO used 2 T...

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Abstract

The present invention provides a silica-coated orange-red fluorescent powder, a stoichiometric equation thereof being (SrxM1-x-w)3(Si1-yGey)zO5:REw@SiO2. In the equation, M is selected from one or more of Mg, Ca, Ba, Be, Zn, and Li; RE is Eu or a combination of Eu and another rare earth element; SiO2 is a coating material outside the fluorescent powder; and x, y, z, and w represent numerical values in the following ranges respectively and independently: 0<x<=1, 0<y<=0.2, 1<=z<=1.1, and 0<w<=0.2. The present invention further provides a method for preparing the orange-red fluorescent powder. According to the method in the present invention, a raw material is crushed in advance, and the crushed raw material has higher reactivity; and a surface of the fluorescent powder is coated, and the used raw material is low in price and is easy to be obtained, and the stability of the coated fluorescent powder to acid and humidity is enhanced greatly.

Description

technical field [0001] The invention belongs to the field of luminescent materials, in particular to a silicon dioxide-coated orange-red fluorescent powder and a preparation method thereof. Background technique [0002] LED (light-emitting diode) has the characteristics of high efficiency, energy saving, safety, and long life. It is known as the fourth-generation lighting method since the use of fire. There are two ways to realize LED white light. The first way is to use red, yellow and / or blue LED chips alone, and the second way is to use ultraviolet or blue light chips in combination with phosphor powder. Currently, the most economical and feasible method in the market is to use blue chips and yellow YAG phosphors in combination to realize LED lighting, especially LED white lighting. This method is patented by Nichia Corporation of Japan (JP 8-198585). However, due to the lack of red light in the emission band of the YAG phosphor, the white light color rendering of the LE...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/79C09K11/02H01L33/50
CPCC09K11/7734C09K11/77342
Inventor 徐永华
Owner BEIJING JINGCHUANGDA SCI & TECH
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