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Large-particle yttrium aluminum garnet(YAG) phosphor powder and composite auxiliary agent and method for preparing uniform large-particle YAG phosphor powder

A technology of phosphors and large particles is applied in the field of combination additives for preparing YAG phosphors, which can solve the problems of poor particle morphology and uniformity of large particles of YAG phosphors, and achieve broad industrial application prospects, brightness enhancement, packaging and falling BIN rate increase effect

Active Publication Date: 2017-06-30
HEBEI LIFU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The second object of the present invention is to provide a method for preparing large particle YAG phosphor, to solve the problem of particle morphology and poor uniformity of the large particle YAG phosphor prepared by the prior art

Method used

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  • Large-particle yttrium aluminum garnet(YAG) phosphor powder and composite auxiliary agent and method for preparing uniform large-particle YAG phosphor powder
  • Large-particle yttrium aluminum garnet(YAG) phosphor powder and composite auxiliary agent and method for preparing uniform large-particle YAG phosphor powder
  • Large-particle yttrium aluminum garnet(YAG) phosphor powder and composite auxiliary agent and method for preparing uniform large-particle YAG phosphor powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] According to the molar ratio Y: Al: Ce = 2.96: 5: 0.04 respectively weigh Y 2.96 al 5 o 12 : Raw material of 0.04Ce phosphor: 222.84g Y 2 o 3 , 169.96g Al 2 o 3 and 4.5906 g CeO 2 , add 4g flux AlF 3 , Put the above raw materials and flux into 7L deionized water and stir for 1 hour at a speed of 120r / min, then turn on the ultrasonic wave, set the ultrasonic power to 100W, the frequency to 5KHz, ultrasonic for 10min, turn off the ultrasonic wave and stop stirring, After filtering and drying, pass through a 200-mesh sieve to obtain evenly mixed raw materials and flux. Add 4g of potassium phosphate (1% to the mass ratio of the raw material) and 0.02gV 2 o 5 (with the mass ratio of raw material being 0.005%), after mixing evenly, pack into the corundum crucible, under 95% N 2 -5%H 2 Heat to 1550°C in a reducing atmosphere, keep warm for 2 hours and then cool to room temperature. The sintered powder was pulverized, passed through a 150-mesh sieve, and then ball-m...

Embodiment 2～15

[0032] According to the process steps of Example 1, the finished phosphor powder was prepared by changing the ultrasonic power, frequency and ultrasonic time, and the brightness and particle size of the finished YAG phosphor powder were tested. The test results are shown in Table 1.

[0033] Table 1

[0034]

Embodiment 16～27

[0036] According to the processing step of embodiment 1, change the kind of alkali metal phosphate, its mass ratio with raw material and V 2 o 5According to the mass ratio of the raw materials, the finished YAG phosphor powder is prepared, and the brightness and particle size of the finished phosphor powder are tested.

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Abstract

The invention provides a large-particle yttrium aluminum garnet(YAG) phosphor powder and a composite auxiliary agent and a method for preparing the uniform large-particle YAG phosphor powder. The composite auxiliary agent comprises alkali metal phosphates and vanadium pentoxide(V2O5), and the alkali metal phosphates are at least one of calcium phosphate, potassium phosphate and sodium phosphate. The method includes the steps of weighing the corresponding oxide raw material according to a chemical structural formula of the YAG phosphor powder; adding fluxing agent and deionized water with stirring and dispersing with ultrasonic wave; drying and sieving; adding the composite auxiliary agent, mixing evenly and then sintering to obtain a desired sample after sieving, ball-milling, moisture, filtering and drying. The large-particle YAG phosphor powder has good appearance, and the D50 is greater than 15 micrometers. The distribution of particle size of YAG phosphor powder is uniform, and 0.5< / =k< / =0.7. The brightness is increased and the encapsulation BIN rate is greatly improved. The requirement on the purity of the raw material by the phosphor can be reduced, and the large-particle YAG phosphor powder has wide industrial application prospect.

Description

technical field [0001] The invention relates to a combined auxiliary agent and method for preparing YAG fluorescent powder, in particular to a combined auxiliary agent and method for preparing uniform large particle YAG fluorescent powder and large particle YAG fluorescent powder. Background technique [0002] Due to the advantages of low power consumption, long life, no heavy metals, no flicker, and less heat generation, LED lights have gradually become products recognized by the people. The mainstream LED lamps on the market are usually prepared by coating phosphors on blue light chips, and phosphors with yttrium aluminum garnet (YAG) structure are widely used. With the continuous expansion of the use of LED lamps, the types of phosphors are gradually refined. Large-particle (D50>15μm) YAG phosphors have high luminous brightness and good stability, so they are widely used in COB high-power packaging. However, most of the large-particle YAG phosphors in the market have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
CPCC09K11/7774C09K11/7792
Inventor 杨志平磨玉茹赵金鑫
Owner HEBEI LIFU CHEM TECH