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Tungstate LED (light-emitting diode) fluorescent powder and preparation method thereof

A phosphor and tungstate technology, applied in the field of inorganic luminescent materials and their preparation, can solve the problems of lack of red light components, low color rendering index, and affecting LED luminous efficiency, etc., and achieve simple preparation process, stable chemical properties, and environmental protection. friendly effect

Inactive Publication Date: 2013-10-23
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combination of blue LED and yellow YAG:Ce3+ phosphor is currently the main way to achieve white light. This synthesis method has a low color rendering index due to the lack of red light components.
In addition, white light can also be obtained by mixing red, green and blue phosphors, but there is color reabsorption between LED phosphors mixed in different systems, which seriously affects the luminous efficiency of LEDs.

Method used

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  • Tungstate LED (light-emitting diode) fluorescent powder and preparation method thereof
  • Tungstate LED (light-emitting diode) fluorescent powder and preparation method thereof
  • Tungstate LED (light-emitting diode) fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment one: Zn 0.965 WO 4 : Bi 3+ 0.005 Eu 3+ 0.03 Preparation of tungstate LED phosphor

[0023] 1) Weigh 0.0349g bismuth oxide (Bi 2 o 3 ), 0.1586g europium oxide (Eu 2 o 3 ), 8.6125g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O), 9.8961g sodium tungstate (Na 2 WO 4 2H 2 o).

[0024] 2) Use concentrated nitric acid to completely dissolve bismuth oxide (Bi 2 o 3 ) and europium oxide (Eu 2 o 3 ), were formulated into bismuth nitrate and europium nitrate solutions, and zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) and sodium tungstate (Na 2 WO 4 2H 2 O) were dissolved in distilled water to prepare their own solutions.

[0025] 3) Fully mix the bismuth nitrate, europium nitrate and zinc nitrate solutions, add the sodium tungstate solution drop by drop under constant stirring, after the dropwise addition is completed, continue to stir for 30 minutes, the tungstate precipitate will be formed, suction filtered, and dried at 60°C , prepared as a precursor;

[0026]...

Embodiment 2

[0027] Embodiment two: Zn 0.96 WO 4 : Bi 3+ 0.01 Eu 3+ 0.03 Preparation of tungstate LED phosphor

[0028] 1) Weigh 0.0700g bismuth oxide (Bi 2 o 3 ), 0.1586g europium oxide (Eu 2 o 3 ), 8.5675g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O), 9.8961g sodium tungstate (Na 2 WO 4 2H 2 o).

[0029] 2) Use concentrated nitric acid to completely dissolve bismuth oxide (Bi 2 o 3 ) and europium oxide (Eu 2 o 3 ), were formulated into bismuth nitrate and europium nitrate solutions, and zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) and sodium tungstate (Na 2 WO 4 2H 2 O) were dissolved in distilled water to prepare their own solutions.

[0030] 3) Fully mix the bismuth nitrate, europium nitrate and zinc nitrate solutions, add the sodium tungstate solution drop by drop under constant stirring, after the dropwise addition is completed, continue to stir for 40 minutes to form a tungstate precipitate, suction filter, and dry at 80°C , prepared as a precursor;

[0031] 4) After grindi...

Embodiment 3

[0032] Embodiment three: Zn 0.95 WO 4 : Bi 3+ 0.02 Eu 3+ 0.03 Preparation of tungstate LED phosphor

[0033] 1) Weigh 0.1398g bismuth oxide (Bi 2 o 3 ), 0.1586g europium oxide (Eu 2 o 3 ), 8.4779g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O), 9.8961g sodium tungstate (Na 2 WO 4 2H 2 o).

[0034] 2) Use concentrated nitric acid to completely dissolve bismuth oxide (Bi 2 o3 ) and europium oxide (Eu 2 o 3 ), were formulated into bismuth nitrate and europium nitrate solutions, and zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) and sodium tungstate (Na 2 WO 4 2H 2 O) were dissolved in distilled water to prepare their own solutions.

[0035] 3) Fully mix the bismuth nitrate, europium nitrate and zinc nitrate solutions, add the sodium tungstate solution drop by drop under constant stirring, after the dropwise addition is completed, continue to stir for 40 minutes to form a tungstate precipitate, suction filter, and dry at 80°C , prepared as a precursor;

[0036] 4) After grindi...

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Abstract

The invention discloses tungstate LED (light-emitting diode) fluorescent powder and a preparation method thereof. The preparation method comprises the following steps of: weighing raw materials according to a chemical expression Zn1-x-yWO4:Bi3+x,Eu3+y, wherein x is more than or equal to 0.005 and less than or equal to 0.05, y is more than 0 and less than or equal to 0.05; respectively dissolving compounds containing Bi<3+> and Eu<3+> into a bismuth nitrate solution and an europium nitrate solution, dissolving compounds containing Zn<2+> and WO4<2-> into respective solutions, mixing the bismuth nitrate solution, the europium nitrate solution and a zinc solution and then adding a tungstate solution, carrying out suction filtration on formed precipitate and drying the formed precipitate, grinding and calcining a made precursor, cooling to room temperature and then taking out the precursor, and grinding to obtain a tungstate LED fluorescent powder sample. The tungstate LED fluorescent powder has stronger absorption capacity in the range of 220-380nm and respectively has an emission peak in a blue light region, a green light region and an orange red region, and different light rays in different colours can be obtained by regulating ratio of Bi<3+> to Eu<3+> and changing excitation wavelength.

Description

technical field [0001] The invention relates to an inorganic luminescent material and a preparation method thereof, in particular to a tungstate LED phosphor and a preparation method thereof. Background technique [0002] Light-emitting diode (LED) is a green and environment-friendly semiconductor solid light source, which has the advantages of high brightness, low energy consumption, long life, small size, shock resistance, environmental protection, and fast response. The combination of blue LED and yellow YAG:Ce3+ phosphor is currently the main way to achieve white light. This synthesis method has a low color rendering index due to the lack of red light components. In addition, white light can also be obtained by mixing red, green and blue phosphors, but there is color reabsorption between LED phosphors mixed in different systems, which seriously affects the luminous efficiency of LEDs. Single host tungstate phosphor Zn co-activated using Bi3+ and Eu3+ 1-x-y WO 4 : Bi ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/68
Inventor 师进生王丽丽姚慧民
Owner QINGDAO AGRI UNIV
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