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Lithium strontium aluminophosphate fluorescent powder and preparation method thereof

A phosphor and aluminophosphate technology, applied in chemical instruments and methods, luminescent materials, climate sustainability, etc., can solve the problems of difficult preparation of luminescent materials, low luminous efficiency, poor spectral matching, etc., to improve product purity , low preparation temperature and simple process

Active Publication Date: 2021-03-16
KUNMING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of difficult preparation of luminescent materials, poor spectral matching, and low luminous efficiency in the prior art, the object of the present invention is to provide a lithium strontium aluminophosphate phosphor

Method used

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  • Lithium strontium aluminophosphate fluorescent powder and preparation method thereof
  • Lithium strontium aluminophosphate fluorescent powder and preparation method thereof
  • Lithium strontium aluminophosphate fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Li 2 Sr 1.96 Al(PO 4 ) 3 :0.04Eu 3+ Synthesis of phosphors.

[0028] Weigh 0.74 grams of lithium carbonate, 2.89 grams of strontium carbonate, 0.51 grams of aluminum oxide, 1.98 grams of diammonium hydrogen phosphate, 0.070 grams of europium trioxide and 0.09 grams of LiF according to the stoichiometric ratio, and place the weighed raw materials in an agate mortar In the process, the powder is finely ground and mixed uniformly by means of grinding.

[0029] Then put the mixed raw materials in the corundum boat, in the high-temperature resistance furnace, under the air atmosphere, heat up to 450°C at a heating rate of 100°C / hour, and keep at this temperature for 3 hours, then slowly cool to room temperature .

[0030] Grind the above roasted product into powder, put it in a corundum boat, heat it up to 850°C at a rate of 200°C / hour in an air atmosphere in a high-temperature resistance furnace, and keep it at this temperature for 4 hours. Secondary firing followed ...

Embodiment 2

[0035] Li 2 Sr 1.90 Al(PO 4 ) 3 :0.10Dy 3+ Phosphor Synthesis

[0036] Weigh 0.74 grams of lithium carbonate, 2.80 grams of strontium carbonate, 0.51 grams of aluminum oxide, 1.98 grams of diammonium hydrogen phosphate, 0.373 grams of dysprosium trioxide and 0.06 grams of LiF according to the stoichiometric ratio, and put the weighed raw materials in an agate mortar In the process, the powder is finely ground and mixed uniformly by means of grinding.

[0037] Then put the mixed raw materials in the corundum boat, in the high-temperature resistance furnace, under the air atmosphere, heat up to 500°C at a heating rate of 200°C / hour, and keep at this temperature for 3 hours, then slowly cool to room temperature .

[0038] Grind the above roasted product into powder, put it in a corundum boat, heat it to 840°C at a rate of 300°C / hour in an air atmosphere in a high-temperature resistance furnace, and keep it at this temperature for 5 hours. Secondary firing followed by slow ...

Embodiment 3

[0042] Li 2 Sr 1.98 Al(PO 4 ) 3 :0.02Tb 3+ Phosphor Synthesis

[0043] Weigh 0.74 grams of lithium carbonate, 2.90 grams of strontium carbonate, 0.51 grams of aluminum oxide, 1.98 grams of diammonium hydrogen phosphate, 0.036 grams of terbium trioxide and 0.06 grams of LiF according to the stoichiometric ratio, and put the weighed raw materials in an agate mortar In the process, the powder is finely ground and mixed uniformly by means of grinding.

[0044] Then put the mixed raw materials in the corundum boat, in the high-temperature resistance furnace, under the air atmosphere, heat up to 500°C at a heating rate of 100°C / hour, and keep at this temperature for 3 hours, then slowly cool to room temperature .

[0045] Grind the above roasted product into powder, put it in a corundum boat, heat it to 850°C at a heating rate of 300°C / hour in an air atmosphere in a high-temperature resistance furnace, and keep it at this temperature for 4 hours. Secondary firing followed by ...

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Abstract

The invention provides rare earth ion doped aluminum, strontium and lithium phosphate fluorescent powder. The chemical general formula of the fluorescent powder is Li2Sr2-xAl(PO4)3:xR, Li2Sr2Al(PO4)3serves as a matrix material, 0.01<=x<=0.2, doped R refers to central luminescent ions, and R refers to one or combination of rare earth Ce, Tb, Eu and Dy ions. The fluorescent powder can be stimulatedby purple light or blue light, strong light is outputted in a visible region, light stability is good, and the fluorescent powder can be used for a luminescent layer of a while LED (light-emitting diode). The fluorescent powder is prepared by a high-temperature solid phase method, fluoride serves as a fluxing agent, volatilization of lithium and phosphorus is reduced, product purity is greatly improved, the fluorescent powder can be roasted at low temperature, and preparation cost is greatly reduced.

Description

technical field [0001] The invention relates to a fluorescent powder for white light LEDs, in particular to a lithium strontium aluminum phosphate fluorescent powder and a preparation method thereof, belonging to the technical field of inorganic luminescent materials. Background technique [0002] As a new generation of light-emitting devices, white LEDs have the advantages of power saving, shock resistance, long life, fast response, recyclability, and no pollution. They are widely used in lighting, display and other fields, and are known as the most promising development in the 21st century. Green light source. At present, there are two main white light LED preparation technologies: (1) red, green, and blue monochromatic LEDs are combined to produce white light. This method can adjust the color, but the power supply is complicated and expensive; (2) blue or purple LED chips are used. Exciting the phosphor powder, using the leaked light of the LED chip and the converted lig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/71
CPCC09K11/771C09K11/7724C09K11/7738C09K11/7753C09K11/7796Y02B20/00
Inventor 鞠海东邓秀君黄显林王宝玲黄素芳翁哲慧方云山刘永波
Owner KUNMING UNIV