Aluminum silicate yellow-green fluorescent powder for LED and preparation method thereof

A yellow-green phosphor, aluminosilicate technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problem of less aluminosilicate-based phosphors, and achieve easy industrial production, cheap and easy-to-obtain raw materials, and luminescence. strong effect

Inactive Publication Date: 2014-08-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And another kind of fluorescent powder——aluminosilicate fluorescent powder also has the characteristics of aluminum and silicate matrix, such as: CN1995276A, CN10142911A, CN101595201A, but the aluminosilicate matrix fluorescent powder is still relatively small, and has great development prospects

Method used

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  • Aluminum silicate yellow-green fluorescent powder for LED and preparation method thereof
  • Aluminum silicate yellow-green fluorescent powder for LED and preparation method thereof
  • Aluminum silicate yellow-green fluorescent powder for LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0021] According to the chemical formula Ca 1.99 AlMg 0.5 Si 1.5 O- 7 :0.01Eu 2+ Weigh CaCO 3 (A.R.)1.99mol, Al(NO 3 ) 3 ·9H 2 O (A.R.) 1mol, Mg (NO 3 ) 2 ·6H 2 O (A.R.) 0.5mol, nano-SiO 2 1.5mol, Eu 2 O 3 (99.99%) 0.005mol; then weigh the surfactant polyethylene glycol of 0.8wt% of the total mass of the above drugs; prepare the precipitant NH 4 HCO 3 solution, the concentration is 3mol / L; the Eu will be weighed 2 O 3 Dissolve with an appropriate amount of nitric acid, add an appropriate amount of deionized water, and then heat to 50 °C for water bath treatment; add CaCO to the above solution 3 , Al(NO 3 ) 3 ·9H 2 O, Mg (NO 3 ) 2 ·6H 2 O, nano-SiO 2 , polyethylene glycol, stir at the same time, add precipitating agent dropwise, adjust PH=9, continue stirring for 1 hour; directly dry to obtain fluffy precursor; place the precursor in an atmosphere furnace with hydrogen for calcination, and the calcination temperature At 1150°C, and the calcination time ...

Embodiment example 2

[0023] According to the chemical formula Ca 1.985 AlMg 0.5 Si 1.5 O- 7 :0.015Eu 2+ Weigh CaCO 3 (A.R.)1.985mol, Al(NO 3 ) 3 ·9H 2 O(A.R.) 1mol, Mg(NO 3 ) 2 ·6H 2 O(A.R.) 0.5mol, nano-SiO 2 1.5mol, Eu 2 O 3 (99.99%) 0.0075mol; then weigh the surfactant polyethylene glycol of 0.6wt% of the total mass of the above drugs; prepare a precipitant (NH 4 ) 2 C 2 O 4 +NH 3 ·H 2 O solution with a concentration of 3 mol / L; the weighed Eu 2 O 3 Dissolve with an appropriate amount of nitric acid, add an appropriate amount of deionized water, and then heat to 45°C for water bath treatment; add CaCO to the above solution 3 , Al(NO 3 ) 3 ·9H 2 O, Mg (NO 3 ) 2 ·6H 2 O, nano-SiO 2 , polyethylene glycol, stir at the same time, add precipitant dropwise, adjust PH=9, continue stirring for 2 hours; directly dry to obtain fluffy precursor; put the precursor in a mixed gas of nitrogen and hydrogen (H2 and N 2 ) in an atmosphere furnace, the calcination temperature is 1200...

Embodiment example 3

[0025] According to the chemical formula Ca 1.99 AlMg 0.5 Si 1.5 O- 7 :0.01Eu 2+ Weigh CaCl 2 (A.R.)1.99mol, Al(NO 3 ) 3 ·9H 2 O(A.R.) 1mol, MgCl 2 (A.R.) 0.5mol, nano-SiO 2 1.5mol, Eu 2 O 3 (99.99%) 0.005mol; then weigh the surfactant polyethylene glycol with 0.4wt% of the total mass of the above drugs; prepare a precipitant (NH 4 ) 2 CO 3 solution, the concentration is 2mol / L; the Eu will be weighed 2 O 3 Dissolve with an appropriate amount of hydrochloric acid, add an appropriate amount of deionized water, and heat to 40 °C for water bath treatment; add CaCl to the above solution 2 , Al(NO 3 ) 3 ·9H 2 O, MgCl 2 (A.R.), nano-SiO 2 , polyethylene glycol, stir at the same time, add precipitating agent dropwise, adjust PH=8, continue to stir for 3 hours; directly dry to obtain fluffy precursor; place the precursor in a stream of hydrogen (H 2 ) in an atmosphere furnace, the calcination temperature is 1250°C, and the calcination time is 3 hours, to obtain t...

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PUM

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Abstract

The invention relates to aluminum silicate yellow-green fluorescent powder for LED and a preparation method thereof, belonging to the technical field of luminescent materials. The chemical formula is Ca2-xAlMg0.5Si1.5O7: xEu<2+>, wherein x is greater than 0 and less than or equal to0.05. Specifically, the preparation method comprises the steps of weighing a calcium salt, a magnesium salt, an aluminum salt, nanometer silica, europium oxide and an appropriate amount of surfactant according to the stoichiometric ratio of each element in the chemical formula; preparing a precipitant solution; dissolving europium oxide with concentrated acid, adding an appropriate amount of deionized water and carrying out bath treatment; adding the calcium salt, the magnesium salt, the aluminum salt, nanometer silica and the surfactant, continuously stirring and mixing uniformly, dropwise adding the precipitating agent, adjusting pH to be greater than or equal to 7, continuously stirring for 1-4 hours, and directly drying to obtain a precursor; placing the precursor in an atmosphere furnace with a reducing atmosphere and calcining at 1000-1300 DEG C for 2-7 hours to obtain the yellow-green fluorescent powder for LED, which is suitable for near ultraviolet radiation and has the advantages of high luminescence intensity and stability.

Description

technical field [0001] The invention belongs to the technical field of light-emitting materials for LEDs, and particularly relates to an aluminosilicate yellow-green phosphor and a preparation method thereof. Background technique [0002] LED (light emitting diode) is a new type of light-emitting device that emits ultraviolet / near-ultraviolet or visible light driven by low-voltage direct current (2.5-16V). White LED is a new type of LED lighting device developed based on traditional LED, which emits white light. The advantages of easy maintenance, etc., are known as the fourth-generation green lighting source, which is of great significance to energy conservation and environmental protection. [0003] The current method for realizing white light LEDs is that blue InGaN chips excite YAG (Y 3 Al 5 O 12 :Ce 3+ ) phosphor produces yellow light, which is mixed with the blue light of the chip to form white light. Due to the lack of red light components in the emission spectr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
Inventor 朱达川赵聪涂铭旌
Owner SICHUAN UNIV
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