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Manufacturing method of red nitride fluorescent powder for LED

A technology of red fluorescent powder and manufacturing method, which is applied in the direction of chemical instruments and methods, luminescent materials, gas discharge lamps, etc., can solve the problems of luminous body crystal shape damage, large finished product particles, wide particle size distribution, etc., and achieve sintering hardness The effect of reducing, reducing the ball milling time, and shortening the burning time

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 and high luminous efficiency, which is beneficial to industrial production, there are also certain defects, such as the need for two high-temperature burnings, long heating time in a reducing atmosphere, etc. Not only is energy wasted, but the resulting finished product has large particles, wide particle size distribution, and is easy to agglomerate. It takes a long time for ball milling 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 efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The chemical formula is: Ca 0.96 Mg 0.01 Gd 0.02 SiAlN 3

[0019] a) Accurately weigh 142.3g of calcium nitride, 1.0g of magnesium nitride, 5.1g of gadolinium nitride, 140.2g of silicon nitride, and 122.9g of aluminum nitride;

[0020] b) Accurately weigh 8.2g of boric acid and carry out dry ball milling for 5 hours, then pass through a 250-mesh sieve;

[0021] c) Put the raw materials obtained in steps a) and b) into a ball mill and mix them thoroughly, and the mixing time is 10 hours;

[0022] d) Put the mixture obtained in step c) into a crucible and put it into a high-temperature atmosphere furnace;

[0023] e) In an inert atmosphere of pure nitrogen in a high-temperature atmosphere furnace, burn at a constant temperature of 1700 ° C for 4.5 hours;

[0024] f) Take out the primary product obtained in step e) from the crucible, and after cooling down to room temperature, use a rod and pestle to roughly crush it, then crush it twice with a roller, ...

Embodiment 2

[0027] Embodiment 2: chemical formula is: Ca 0.96 Ba 0.01 Gd 0.02 SiAlN 3

[0028] i) Accurately weigh 284.6g of calcium nitride, 8.8g of barium nitride, 10.2g of gadolinium nitride, 280.4g of silicon nitride, and 245.8g of aluminum nitride;

[0029] j) Accurately weigh 16.6g of boric acid and carry out dry ball milling for 5 hours, then pass through a 250-mesh sieve;

[0030] k) Put the raw materials obtained in steps a) and b) into a planetary ball mill and mix them thoroughly, and the mixing time is 10 hours;

[0031] l) Put the mixture obtained in step c) into a crucible and put it into a high-temperature atmosphere furnace;

[0032] m) In an inert atmosphere of pure nitrogen in a high-temperature atmosphere furnace, burn at a constant temperature of 1700°C for 4.5h;

[0033] n) Take the primary product obtained in step e) out of the crucible, and after cooling down to room temperature, use a rod and pestle to roughly crush it, then crush it twice with a roller, and ...

Embodiment 3

[0036] Embodiment 3: chemical formula is: Ca 0.93 Mg 0.04 Ce 0.02 SiAlN 3

[0037] q) Accurately weigh 183.8g of calcium nitride, 5.4g of magnesium nitride, 12.3g of cerium nitride, 187.0g of silicon nitride, and 163.96g of aluminum nitride;

[0038] r) Accurately weigh 11.0g of boric acid and carry out dry ball milling for 5h, then pass through a 250-mesh sieve;

[0039] s) Put the raw materials obtained in steps a) and b) into the planetary ball mill and mix them thoroughly, and the mixing time is 17 hours;

[0040] t) Put the mixture obtained in step c) into a crucible and put it into a high-temperature atmosphere furnace;

[0041] u) In a high-temperature atmosphere furnace, pass in an inert atmosphere of pure nitrogen, and burn at a constant temperature of 1700 ° C for 4.5 hours;

[0042] v) Take out the primary product obtained in step e) from the crucible, and after cooling down to room temperature, use a rod and pestle to roughly crush it, then crush it twice wit...

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PUM

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Abstract

The invention relates to a manufacturing method of red nitride fluorescent powder for LED. The manufacturing method 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 manufacturing 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 crystal brightness of a final product is improved.

Description

technical field [0001] The invention relates to a method for manufacturing fluorescent powder for LEDs, and more specifically relates to a method for manufacturing red fluorescent powder from nitride. Background technique [0002] LED refers to a light-emitting diode, which is a solid-state semiconductor device that can convert electrical energy into visible light. Electroluminescence. The characteristics of LED are very obvious, such as long life, high luminous efficiency, no radiation and low power consumption, high stability, small size, and impact resistance, so it is widely used in many fields. The traditional way of realizing white light LED is blue light chip superimposed yellow phosphor powder, the white light obtained by this method has poor color rendering, and blue light chip or ultraviolet chip superimposed multi-color system phosphor powder, such as: red phosphor powder, green phosphor powder, etc. , LEDs with better color rendering can be realized, so the nit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80
CPCY02B20/181Y02B20/00
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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