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Preparation method of rare earth element-doped yttrium aluminum garnet fluorescent powder

A technology of yttrium aluminum garnet and rare earth element is applied in the field of manufacturing phosphor powder for white light LED, which can solve the problems of luminous body crystal shape destruction, luminous efficiency decrease, wide particle size distribution, etc. The effect of increasing the brightness of the crystal

Inactive Publication Date: 2013-11-27
徐州泰歆塬光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the quality of microcrystalline crystals obtained by this method is excellent, with few surface defects, high luminous efficiency, and beneficial to industrial production, there are also certain defects. Wide size distribution, easy to agglomerate, long time ball milling is required to reduce the particle size, but at the same time, it is easy to damage the crystal shape of the luminous body and reduce the luminous rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: chemical formula is Y 2.9 Al 5.0 o 12 Ce 0.1

[0020] a) Accurately weigh 1773.44g of Y 2 o 3 , 1380g of Al 2 o 3 , 93.08g of CeO 2 ;

[0021] b) Accurately weigh 160g of boric acid and pass through a 200-mesh sieve after dry ball milling for 5 hours;

[0022] c) Put the raw materials obtained in steps a) and b) into a double-cone mixer to fully mix, and the mixing time is 24 hours;

[0023] d) packing the mixture obtained in step c) into a crucible and putting it into a high-temperature tunnel kiln;

[0024] e) Pass a reducing atmosphere of pure hydrogen in a high-temperature tunnel kiln, and burn at a constant temperature of 1457°C for 4.15h;

[0025] f) Take out the primary product obtained in the step e) from the crucible, and after cooling down to room temperature, first use a rod and pestle to roughly crush it, then crush it twice with a roller, and finally perform ball milling for 1.5 hours;

[0026] g) washing the initial product obtain...

Embodiment 2

[0028] Embodiment 2: chemical formula is Y 2.8 1G 0.07 Al 5.0 o 12 Ce 0.12

[0029] i) Accurately weigh 1681.04g of Y 2 o 3 , 1350g of Al 2 o 3 , 67.18g of Gd 2 o 3 , 109.27g of CeO 2 ;

[0030] j) Accurately weigh 160g of strontium fluoride and pass through a 200-mesh sieve after dry ball milling for 5 hours;

[0031] k) Put the raw materials obtained in steps a) and b) into a double-cone mixer to fully mix, and the mixing time is 30 hours;

[0032] 1) the mixture obtained in step c) is packed into a crucible and put into a high-temperature tunnel kiln;

[0033] m) Pass a reducing atmosphere of pure hydrogen in a high-temperature tunnel kiln, and burn at a constant temperature of 1457°C for 4.15h;

[0034] n) Take out the initial product obtained in the step e) from the crucible, and after cooling down to room temperature, first use a rod and pestle to roughly crush it, then crush it twice with a roller, and finally perform ball milling for 1.5 hours;

[0035] ...

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Abstract

The invention provides a preparation method of rare earth element-doped yttrium aluminum garnet fluorescent powder, relates to a preparation method of fluorescent powder for LED and especially relates to a method for preparing red fluorescent powder from nitrides. The preparation method provided by the invention comprises the following steps of weighing raw materials, carrying out ball milling of one or more fluxing agents, sieving, mixing, sintering, crushing, washing, sieving and carrying out packaging. Compared with the existing high-temperature solid-state technology, the preparation method has the advantages that only one high-temperature sintering process on the raw materials is carried out and thus sintering hardness of powder is reduced obviously and sintered powder blocks are incompact so that processes and energy consumption are reduced and product quality is improved; and the one or more fluxing agents are subjected to ball milling in advance so that ball milling time of an initial product is greatly reduced and excitation efficiency of a final product is improved.

Description

1. Technical field [0001] The invention relates to a method for manufacturing a fluorescent powder for white light LEDs, and more particularly relates to a method for manufacturing yttrium aluminum garnet fluorescent powder doped with rare earth elements. 2. Background technology [0002] White light LED has many advantages such as high efficiency, energy saving, environmental protection, stability, fast response, small size, long life, and impact resistance, so it is widely used in many fields. [0003] There are many ways to produce white LEDs. The more mature and commonly used method is to coat the blue LED chips with yellow phosphors that can be excited by blue light, emit yellow light and mix with the remaining blue light to form white light. [0004] At present, the phosphor powder used in white LED is mainly yttrium aluminum garnet phosphor powder, also known as YAG phosphor powder. Because of its excellent optical properties and good mechanical and thermal propertie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80
Inventor 杜燃利刘波刘旭李彬
Owner 徐州泰歆塬光电科技有限公司
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