Yellow fluorescent powder and preparation method thereof

A yellow phosphor powder and temperature control technology, which is applied in the field of yellow phosphor powder and its preparation, can solve problems such as glare, poor color rendering of LEDs, and uneven luminescence, and achieve the goals of reducing reaction temperature and time, uniform distribution, and high luminous efficiency Effect

Inactive Publication Date: 2015-06-10
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] One of the objectives of the present invention is to provide a yellow phosphor to solve the technical problems of poor color rendering, glare, and obvious unevenness of light emission when the LED prepared by the current phosphor is illuminated in a large area.

Method used

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  • Yellow fluorescent powder and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0018] A kind of yellow fluorescent powder, its general chemical formula is (Ca 0.37 ,Sr 0.53-x-y , Ba x ) 7 (SiO 3 ) 6 Cl 2 :0.10Eu 2+ , y Dy 3+ , where x=0.05, y=0.03, that is (Ca 0.37 ,Sr 0.45 , Ba 0.05 ) 7 (SiO 3 ) 6 Cl 2 :0.10 Eu 2+ , 0.03 Dy 3+ .

[0019] The above-mentioned preparation method of a yellow fluorescent powder is characterized in that the steps are as follows:

[0020] First calculated by molar ratio, CaCO 3 : SrCl 2 .6H 2 O: BaCl 2 : SiO 2 : Eu 2 o 3 : Dy 2 o 3 is 2.59: k (3.71-7 x -7 y ): 7 x :7.2:0.7:7 y proportion of which k =6.85, x=0.05, y=0.03, namely CaCO 3 : SrCl 2 .6H 2 O: BaCl 2 : SiO 2 : Eu 2 o 3 : Dy 2 o 3 For the ratio of 2.59:23.625:0.35:7.2:0.7:0.21, the CaCO 3 、Eu 2 o 3 、Dy 2 o 3 , BaCl 2 , SiO 2 and SrCl 2 .6H 2 O was thoroughly mixed and ground in an agate mortar, then put into a tangerine pot, put into a muffle furnace for reduction by buried charcoal method, and sintered at a constant ...

Embodiment 2

[0024] A kind of yellow fluorescent powder, its general chemical formula is (Ca 0.37 ,Sr 0.53-x-y , Ba x ) 7 (SiO 3 ) 6 Cl 2 :0.10Eu 2+ , y Dy 3+ , where x=0.10, y=0.03, that is (Ca 0.37 ,Sr 0.40 , Ba 0.10 ) 7 (SiO 3 ) 6Cl 2 :0.10 Eu 2+ ,0.03Dy 3+ .

[0025] The above-mentioned preparation method of a yellow fluorescent powder is characterized in that the steps are as follows:

[0026] First calculated by molar ratio, CaCO 3 : SrCl 2 .6H 2 O: BaCl 2 : SiO 2 : Eu 2 o 3 : Dy 2 o 3 2.59: k (3.71-7 x -7 y ): 7 x :7.2:0.7:7 y proportion of which k =7.5, x=0.10, y=0.03, namely CaCO 3 : SrCl 2 .6H 2 O: BaCl 2 : SiO 2 : Eu 2 o 3 : Dy 2 o 3 For the ratio of 2.59:21:0.7:7.2:0.7:0.21, the CaCO 3 、Eu 2 o 3 、Dy 2 o 3 , BaCl 2 , SiO 2 and SrCl 2 .6H 2 O was thoroughly mixed and ground in an agate mortar, then put into a tangerine pot, put into a muffle furnace for reduction by buried charcoal method, and sintered at a constant temperature...

Embodiment 3

[0029] A kind of yellow fluorescent powder, its general chemical formula is (Ca 0.37 ,Sr 0.53-x-y , Ba x ) 7 (SiO 3 ) 6 Cl 2 :0.10Eu 2+ , y Dy 3+ , where x=0.10, y=0.01, that is (Ca 0.37 ,Sr 0.42 , Ba 0.10 ) 7 (SiO 3 ) 6 Cl 2 :0.10 Eu 2+ , 0.01Dy 3+ .

[0030] The above-mentioned preparation method of a yellow fluorescent powder is characterized in that the steps are as follows:

[0031] First calculated by molar ratio, CaCO 3 : SrCl 2 .6H 2 O: BaCl 2 : SiO 2 : Eu 2 o 3 : Dy 2 o 3 is 2.59: k (3.71-7 x -7 y ): 7 x :7.2:0.7:7 y proportion of which k =4, x=0.10, y=0.01, namely CaCO 3 : SrCl 2 .6H 2 O: BaCl 2 : SiO 2 : Eu 2 o 3 : Dy 2 o 3 For the ratio of 2.59:11.76:0.7:7.2:0.7:0.07, the CaCO 3 、Eu 2 o 3 、Dy 2 o 3 , BaCl 2 , SiO 2 and SrCl 2 .6H 2 O was thoroughly mixed and ground in an agate mortar, then put into a tangerine pot, put into a muffle furnace for reduction by buried charcoal method, and sintered at a constant tempera...

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Abstract

The invention discloses yellow fluorescent powder and a preparation method thereof. The chemical expression of the yellow fluorescent powder is Ca0.37, Sr(0.53-x-y), Bax)7(SiO3)6C12: 0.10EU<2+>, yDy<3+>, wherein x is greater than or equal to 0.05 and less than or equal to 0.15, and y is greater than or equal to 0.01 and less than or equal to 0.09. The preparation method comprises the steps of: carrying out constant-temperature sintering on CaCO3, SrC12.6H2O, BaC12, SiO2, Eu2O3 and Dy2O3 at 950 DEG C for 10h by using a self-service solvent method, wherein the sintering process is reduced by using a carbon burying method, washing the product obtained by the sintering by deionized water to remove the needless SrC12.6H2O, and carrying out vacuum drying at a temperature of 80 DEG C to obtain the yellow fluorescent powder. The yellow fluorescent powder is excited by ultraviolet and used for white-light LED (Light Emitting Diode), and has the advantages of large light emitting area, no glare and high light emitting efficiency.

Description

technical field [0001] The invention relates to a high-brightness non-glare yellow fluorescent powder for white LEDs and a preparation method thereof. Background technique [0002] There are three main methods to realize white light LED: one is the phosphor powder conversion method, that is, coating the phosphor powder on the LED chip, and the light emitted by the chip and the phosphor powder is combined to form white light; the other is the multi-chip method, using red, green, blue The LED chips of three colors use the principle of three primary colors to emit white light according to a certain ratio; the third is the integrated single-chip method (also called the multi-quantum well method), which uses multiple active layers in one chip to make the LED chip emit white light directly. . The light conversion type is currently the most widely used and mature method to realize white light LEDs. At present, commercial white light LEDs are mainly realized by "blue light InGaN ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/61
Inventor 房永征刘冯新张娜侯京山张灵彦于圣洁
Owner SHANGHAI INST OF TECH
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