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Phosphate fluorescent powder with adjustable color from blue to green, and preparation method thereof

A technology of phosphate and phosphor, applied in the field of materials science

Inactive Publication Date: 2015-10-14
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no information on the use of Sr, Ba to replace Ca 9 MgNa(PO 4 ) 7 :Eu 2+ Ca in phosphor powder 2+ Ions, changing the crystal field environment, adjusting the emission wavelength of phosphors, in order to achieve the purpose of spectrum adjustable

Method used

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  • Phosphate fluorescent powder with adjustable color from blue to green, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Preparation of Ca 8.955 MgNa(PO 4 ) 7 :0.005Eu 2+ .

[0012] Weigh calcium carbonate 0.482g, basic magnesium carbonate 0.0522g, sodium carbonate 0.0285g, europium oxide 0.0043g, ammonium dihydrogen phosphate 0.433g, place in a mortar and grind and mix for 30min, then add alcohol and grind for 60min to obtain the mixture, and The mixture was placed in a corundum crucible and placed in a high-temperature furnace, calcined at 1050 °C for 24 hours under a CO reducing atmosphere, cooled naturally and ground into powder.

Embodiment 2

[0014] Preparation (Ca 0.5 Sr 0.5 ) 8.955 MgNa(PO 4 ) 7 :0.005Eu 2+ .

[0015] Weigh 0.2151g of calcium carbonate, 0.3204g of strontium carbonate, 0.0469g of basic magnesium carbonate, 0.0256g of sodium carbonate, 0.0038g of europium oxide, and 0.3883g of ammonium dihydrogen phosphate, put them in a mortar and grind for 30 minutes, then add acetone and grind for 10 minutes After the mixture is obtained, the mixture is put into a corundum crucible and placed in a high-temperature furnace, calcined at 1050° C. for 24 hours under a CO reducing atmosphere, cooled naturally and ground into powder.

Embodiment 3

[0017] Preparation of Sr 8.955 MgNa(PO 4 ) 7 :0.005Eu 2+ .

[0018] Weigh 0.6443g of strontium nitrate, 0.0504g of magnesium nitrate, 0.0289g of sodium nitrate, 0.0027g of europium oxide, and 0.2737g of ammonium dihydrogen phosphate, put them in a mortar and grind and mix for 30min, then add acetone and grind for 10min to obtain the mixture, put the mixture Put it into a corundum crucible and place it in a high-temperature furnace, calcinate at 1300°C for 3 hours under a hydrogen-nitrogen mixture reducing atmosphere, then cool naturally and grind it into powder.

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Abstract

The invention discloses a phosphate fluorescent powder with adjustable color from blue to green. The chemical formula is (Ca<1-x-y>Sr<x>Ba<y>)<8.955>MgNa(PO4)7:0.005Eu2+, wherein when 0<x<=1, y=0, and when x=0, 0<y<=1. The invention also provides a preparation method of the phosphate fluorescent powder. The preparation method comprises following steps: a calcium salt, a strontium salt, a barium salt, a sodium salt, basic magnesium carbonate, and europium oxide or europium nitrate are uniformly mixed with a phosphate, an obtained mixture is grinded, and is delivered into a corundum crucible, and the corundum crucible is delivered into a high temperature furnace; high temperature calcination is carried out in a reducing atmosphere, and an obtained product is subjected natural cooling, and is grinded into powder so as to obtain the phosphate fluorescent powder with adjustable color from blue to green. According to the preparation method, ion sites of Ca2+ are replaced by that of Ba2+ or Sr2+, crystal field environment is changed, luminescence spectrum of the fluorescent powder can be adjusted from blue to green, and color adjusting is realized.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a rare earth luminescent material, specifically a phosphate fluorescent powder with adjustable blue to green color and a preparation method thereof. Background technique [0002] White light-emitting diodes (white light-emitting diodes, WLEDs) have broad application prospects in the field of lighting and display due to their long life, low energy consumption, no pollution, high efficiency, and small size. light source. [0003] The improvement of ultraviolet / near-ultraviolet chip research and development technology has made the research and development of three primary color phosphors used in conjunction with it a major topic in the field of phosphors. Because of its low preparation temperature, high luminous efficiency, stable physical and chemical properties, and effective absorption of ultraviolet photon energy, phosphate has become a widely used substrate in the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/71
Inventor 房永征刘启会侯京山刘玉峰张娜赵国营
Owner SHANGHAI INST OF TECH