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Divalent-bismuth-ion-doped strontium borate fluorescent material and preparation method thereof

A technology of fluorescent materials and bismuth ions, which can be applied in the fields of luminescent materials, chemical instruments and methods, etc., and can solve the problems of few reports on doped luminescent materials.

Inactive Publication Date: 2012-07-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] About bismuth ion Bi 2+ There are few reports on doped luminescent materials

Method used

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  • Divalent-bismuth-ion-doped strontium borate fluorescent material and preparation method thereof
  • Divalent-bismuth-ion-doped strontium borate fluorescent material and preparation method thereof
  • Divalent-bismuth-ion-doped strontium borate fluorescent material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Select strontium carbonate, boric acid and bismuth trioxide as starting materials, press Sr 0.995 B 4 o 7 : 0.005 Bi take by weighing three kinds of raw materials respectively, and the total weight of the control mixture is 20 grams. After 20 grams of the mixture were mixed by ball milling, they were put into a corundum crucible, and then the crucible was put into a high-temperature electric furnace. Precisely control the heating rate, control the boric acid decomposition reaction speed, prevent the mixture from overflowing from the crucible, the sample is at 500 o C in air for 1 hour. Take out the pre-fired sample, grind and mix it again, put it into a crucible, and heat it under air at 750 o C firing for 10 hours. After grinding, under the air at 850 o C firing for 20 hours. After grinding again, the sample is at 850 o CH 2 Treated in medium for 30 minutes, the divalent bismuth-doped strontium borate was prepared. For comparison, samples with the same compos...

Embodiment 2

[0036] Select strontium bicarbonate, diboron trioxide and bismuth powder as starting materials, press Sr 0.995 B 4 o 7 : 0.005 Bi take by weighing three kinds of raw materials respectively, and the total weight of the control mixture is 20 grams. After 20 grams of the mixture were mixed by ball milling, they were put into a corundum crucible, and then the crucible was put into a high-temperature electric furnace. Precisely control the heating rate, control the boric acid decomposition reaction speed, prevent the mixture from overflowing from the crucible, the sample is at 300 o C pre-fired in air for 5 hours. Take out the pre-fired sample, grind and mix it again, put it into a crucible, and heat it under air at 750 o C firing for 10 hours. After grinding, under the air at 850 o C firing for 5 hours. After grinding again, the sample is at 850 o C N 2 / H 2 After 60 minutes of medium treatment, bivalent bismuth-doped strontium borate was prepared. For comparison, sampl...

Embodiment 3

[0038] Select strontium oxalate, boric acid and bismuth powder as starting materials, press Sr 0.995 B 4 o 7 : 0.005 Bi take by weighing three kinds of raw materials respectively, and the total weight of the control mixture is 20 grams. After 20 grams of the mixture were mixed by ball milling, they were put into a corundum crucible, and then the crucible was put into a high-temperature electric furnace. Precisely control the heating rate, control the boric acid decomposition reaction speed, prevent the mixture from overflowing from the crucible, the sample is at 400 o C pre-fired in air for 5 hours. Take out the pre-fired sample, grind and mix it again, put it into a crucible, and heat it under air at 750 o C firing for 10 hours. After grinding, under the air at 850 o C firing for 2 hours. After grinding again, the sample is at 850 o Divalent bismuth-doped strontium borate was prepared by treating in C CO for 600 minutes. For comparison, samples with the same composit...

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Abstract

The invention discloses a divalent-bismuth-ion-doped strontium borate fluorescent material and a preparation method thereof. The preparation method comprises the following steps of: respectively weighing compound raw materials containing strontium, boron and bismuth according to a molecular formula: Sr1-xB4O7:xBi or Sr1-xB6O10:xBi, wherein x is not less than 0.001 and not more than 0.05; evenly grinding and mixing the raw materials, then, preburning, and controlling the temperature at 300-500 DEG C; after preburning, evenly grinding and mixing again, carrying out high-temperature burning twice, and controlling the temperature at 600-900 DEG C; and putting a sample in a reducing atmosphere at the temperature of 600-900 DEG C, and carrying out reaction for 15 min to 10 hours. The luminous intensity of the fluorescent powder prepared by the preparation method disclosed by the invention is over 2 times or 140 times of that of a bismuth-doped sample with the same concentration, which is synthesized in an air atmosphere, and the color-rendering performance of a white LED (Light Emitting Diode) is hopeful to improve.

Description

technical field [0001] The invention relates to the field of luminescent material research, in particular to a divalent bismuth ion-doped strontium borate fluorescent powder and a preparation method thereof. Background technique [0002] Solid-state LED lighting technology has the advantages of low energy consumption, high luminous efficiency, long service life, mercury-free, small size, and unbreakable advantages. In recent years, it has been gradually used in general lighting, automobiles, transportation, imaging, agriculture, medicine and other fields. . Currently commercialized white LEDs (WLEDs) are based on the multiplexing of a blue LED with a blue-absorbing yellow phosphor. This blue-light InGaN LED based on Y 3 Al 5 o 12 : Ce 3+ (YAG:Ce) multiplexed products have better efficiency than compact fluorescent lamps, but compared with incandescent lamps and halogen lamps (color temperature 2500-3200K, color rendering index CRI 100), their disadvantages are high col...

Claims

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Application Information

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IPC IPC(8): C09K11/63
Inventor 彭明营
Owner SOUTH CHINA UNIV OF TECH
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