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Ga-Bi doped aluminate green phosphor and preparation method thereof

A technology of green fluorescent powder and aluminate, which is applied in chemical instruments and methods, luminescent materials, and the use of gas discharge lamps, etc., can solve the problems of reducing the overall light efficiency of fluorescent powder, reduce the process, improve luminous intensity, The effect of saving product quality

Inactive Publication Date: 2014-08-13
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

The existing solution is to change the YAG: Ce by ion substitution 3+ The position of the emission peak is red-shifted, but the disadvantage of this method is that the overall light efficiency of the phosphor is reduced. Therefore, it is urgent to prepare a broad-peak phosphor whose main emission peak is red-shifted relative to YAG: Ce3+, such as the main emission peak in green position phosphor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of Ga-doped aluminate green fluorescent powder, its chemical formula is Y 2.93 Al 3.1 Ga 1.9 o 12 : Ce 3+ 0.07 .

[0021] a) Accurately weigh 487.2g of Y 2 o 3 , 232.2g of Al 2 o 3 , 262.2g of Ga 2 o 3 , 17.7g of CeO 2 ;

[0022] b) Accurately weigh 20g of aluminum fluoride and pass through a 200-mesh sieve after dry ball milling for 2 hours;

[0023] c) Put the raw materials obtained in steps a) and b) into a double-cone mixer to fully mix, and the mixing time is 25 hours;

[0024] d) packing the mixture obtained in step c) into a crucible and putting it into a high-temperature tunnel kiln;

[0025] e) In the high-temperature tunnel kiln, a reducing atmosphere of hydrogen: nitrogen = 3:1 is introduced, and it is burned at a constant temperature of 1580 ° C for 4.5 hours;

[0026] f) taking out the primary product obtained in the step e) from the crucible, and after cooling down to room temperature, coarsely crush it with a stick and pestle, and th...

Embodiment 2

[0030] A kind of aluminate green fluorescent powder doped with Ga, Bi, chemical formula is Y 2.925 Bi 0.005 Al 3.1 Ga 1.9 o 12 : Ce 3+ 0.071 .

[0031] a) Accurately weigh 485.9g of Y 2 o 3 , 232.5g of Al 2 o 3 , 262.0g of Ga 2 o 3 , 17.1g of CeO 2 , 1.71g Bi 2 o 3

[0032] b) Accurately weigh 20g of boric acid and pass through a 200-mesh sieve after dry ball milling for 1.5h;

[0033] c) 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;

[0034] d) packing the mixture obtained in step c) into a crucible and putting it into a high-temperature tunnel kiln;

[0035] e) In the high-temperature tunnel kiln, a reducing atmosphere of hydrogen: nitrogen = 3:1 is introduced, and it is burned at a constant temperature of 1580 ° C for 4.5 hours;

[0036] f) taking out the primary product obtained in the step e) from the crucible, and after cooling down to room temperature, coarsely crush it with a ...

Embodiment 3

[0040] A Ga-doped aluminate green phosphor with a chemical formula of Y 2.93 Al 1.2 Ga 3.8 o 12 : Ce 3+ 0.07 .

[0041] a) Accurately weigh 435.1g of Y 2 o 3 , 80.4g Al 2 o 3 , 468.4g of Ga 2 o 3 , 15.8g of CeO 2 ;

[0042] b) Accurately weigh 10g of aluminum fluoride and 10g of boric acid and carry out dry ball milling for 1.8h and pass through a 200-mesh sieve;

[0043] c) Put the raw materials obtained in steps a) and b) into a double-cone mixer to fully mix, and the mixing time is 27 hours;

[0044] d) packing the mixture obtained in step c) into a crucible and putting it into a high-temperature tunnel kiln;

[0045] e) In the high-temperature tunnel kiln, a reducing atmosphere of hydrogen: nitrogen = 3:1 is introduced, and it is burned at a constant temperature of 1580 ° C for 4.5 hours;

[0046] f) taking out the primary product obtained in the step e) from the crucible, and after cooling down to room temperature, coarsely crush it with a stick and pestle, a...

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Abstract

The invention relates to an aluminate green phosphor doped with rare earth elements gallium and bismuth, and a preparation method of the aluminate green phosphor. The aluminate green phosphor is activated by use of Ce<3+>, and the general formula of the aluminate green phosphor is Y3-x-nBinAl5-yGayO12: Ce<3+>x, wherein the numeric range of x is from 0.01 to 0.2, and preferably from 0.06 to 0.08; the numeric range of y is from 0.5 to 4.5, and preferably from 1.0 to 4.5; the numeric range of n is from 0 to 0.006, and preferably from 0.002 to 0.006. The phosphor having the main emission peak in the green position is obtained by doping YAG (Yttrium Aluminum Garnet) phosphor with the element Ga, and the overall luminous efficacy of the phosphor is not reduced; the green phosphor is matched with yellow phosphor and a blue LED (Light Emitting Diode) chip so that a high-brightness white-light LED can be obtained; if the green phosphor is matched with the blue LED chip, green light can be obtained directly; if the green phosphor is matched with the yellow phosphor and the blue LED chip, cold-tone white light can be obtained; the green phosphor also can be matched with red phosphor and the blue LED chip to obtain white light; and besides, trace bismuth element also can be added to the aluminate green phosphor, so that the luminous intensity of the prepared phosphor can be greatly improved.

Description

technical field [0001] The invention relates to an aluminate green fluorescent powder doped with rare earth elements gallium and bismuth and a preparation method thereof, and is especially suitable for green fluorescent powder for LEDs used under the excitation of blue light chips, and belongs to the technical field of rare earth luminescent materials. Background technique [0002] Light-emitting diode (LED) is a new type of solid-state lighting device developed in recent years, which has the advantages of high efficiency, long life, no pollution, and energy saving. It is widely used in various fields such as LCD backlight, indicator lights, automotive lights, electronic communication equipment, and indoor and outdoor lighting. Its use has a profound impact on energy conservation, environmental protection and sustainable development of the environment. [0003] For general lighting, people need more white light sources. In 1998, the white light LED was successfully develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
CPCY02B20/181Y02B20/00
Inventor 刘旭刘波李彬
Owner 徐州泰歆塬光电科技有限公司
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