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Tm and Eu mono/co-doped lutecium gallium garnet phosphor

A gallium garnet and phosphor technology, applied in the field of luminescent materials, can solve the problems of precursor powder agglomeration, difficulty in forming precursor powder and difficult control of sedimentation rate, and achieve narrow emission peak, easy ball milling, and simple production process Effect

Inactive Publication Date: 2013-10-16
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these products prepared by the co-precipitation method also have some disadvantages: ① Due to the difference in solubility product and sedimentation rate, it is difficult to form a precursor powder with an accurate stoichiometric ratio and uniform components; ② It is difficult to control the appropriate pH value to make the mixed solution The cations are completely precipitated at the same time; ③The obtained precursor powder may be agglomerated during the washing and drying process

Method used

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Effect test

Embodiment 1

[0024] Embodiment 1 A kind of europium monodoped lutetium gallium garnet (LGG) fluorescent powder, chemical formula is Lu 2.98 Ga 5 o 12 :0.02Eu 3+ ;

[0025] 1) dissolving gallium oxide powder with concentrated nitric acid with a mass fraction of 69%; dissolving europium nitrate and lutetium nitrate in deionized water, mixing the two solutions to form a metal ion solution; wherein, Lu 3+ :Eu 3+ : Ga 3+ The molar ratio is 2.98:0.02:5;

[0026] 2) Add citric acid to the metal ion mixed solution prepared in step 1, and mix well to obtain a mixed solution, wherein the molar ratio of citric acid to the sum of the contents of all metal ions is 1.5:1;

[0027] 3) Put the mixed solution in step 2 in a water bath at 80°C for 0.5h, until all of it turns into a pale yellow gel;

[0028] 4) Move the light yellow gel in step 3 into an oven, and keep the temperature at 250° C. for 2 hours to obtain dark brown bulky powder;

[0029] 5) The dark brown bulky powder obtained in step 4) i...

Embodiment 2

[0031] Embodiment 2 A kind of europium monodoped lutetium gallium garnet (LGG) fluorescent powder, its chemical formula is Lu 2.96 Ga 5 o 12 :0.04Eu 3+ .

[0032] 1) gallium oxide powder is dissolved in concentrated nitric acid with a mass fraction of 69%; europium nitrate and lutetium nitrate are dissolved in deionized water, and the two solutions are mixed to form a metal ion solution; wherein, Lu 3+ :Eu 3+ : Ga 3+ The molar ratio is 2.96:0.04:5;

[0033] 2) Add citric acid to the metal ion mixed solution prepared in step 1, and mix well to obtain a mixed solution, wherein the molar ratio of citric acid to the sum of the contents of all metal ions is 1.5:1;

[0034] 3) Put the mixed solution in step 2 in a water bath at 80°C for 1 hour until all of it turns into a pale yellow gel;

[0035] 4) Move the light yellow gel in step 3 into an oven, and keep the temperature at 250° C. for 4 hours to obtain dark brown bulky powder;

[0036] 5) The dark brown bulky powder obta...

Embodiment 3

[0037] Embodiment 3 A kind of europium monodoped lutetium gallium garnet (LGG) fluorescent powder, its chemical formula is Lu 2.99 Ga 5 o 12 :0.01Eu 3+ .

[0038] 1) dissolving gallium oxide powder with concentrated nitric acid with a mass fraction of 69%; dissolving europium nitrate and lutetium nitrate in deionized water, mixing the two solutions to form a metal ion solution; wherein, Lu 3+ :Eu 3+ : Ga 3+ The molar ratio is 2.99:0.01:5;

[0039] 2) Add citric acid to the metal ion mixed solution prepared in step 1, and mix well to obtain a mixed solution, wherein the molar ratio of citric acid to the sum of the contents of all metal ions is 1.5:1;

[0040] 3) Put the mixed solution in step 2 in a water bath at 80°C for 0.8h, until all of it turns into a pale yellow gel;

[0041] 4) Move the light yellow gel in step 3 into an oven, and keep the temperature at 250° C. for 2 hours to obtain dark brown bulky powder;

[0042] 5) The black-brown bulky powder obtained in st...

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Abstract

The invention provides a Tm and Eu mono / co-doped lutecium gallium garnet phosphor. The chemical formula of the phosphor is Lu(3-x-y)Ga5O12:xEu<3+>, yTm<3+>, wherein x is 0-0.04, y is 0-0.02, and x and y cannot be zero simultaneously. Uniform ion mixing is realized through a low temperature combustion method, and the prepared phosphor has the characteristics of spumous and loose structure, no clustering, easy ball milling and high purity. The method has the characteristics of substantial reduction of the furnace temperature, and simple production process, and is an efficient energy-saving synthesis method. The obtained phosphor has a narrow emission peak, has a peak width at half height of 4-5nm, and emits different-color light under the excitation of 241nm light, red light is emitted when only Eu<3+> is doped, blue light is emitted when only Tm<3+> is doped, white light is emitted when Eu<3+> and Tm<3+> are codoped, the phosphor can be compounded with an ultraviolet LED chip to realize white light emission.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to thulium and europium single / co-doped lutetium gallium garnet (LGG) fluorescent powder for white light emitting diodes. Background technique [0002] White light LED has the advantages of less energy consumption and no pollution. It is called the fourth generation lighting source and has broad application prospects. [1] . At present, there are three main methods to realize white LED [2] : One is the phosphor light conversion method, which uses the blue light emitted by the GaN-based chip to excite YAG:Ce 3+ Phosphor, the light emitted by the chip and the phosphor are mixed to form white light; the second is the multi-chip method, using LED chips of three colors, red, green and blue, using the principle of three primary colors, and combining them according to a certain ratio to emit white light; the third is integrated single chip The multi-quantum well...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
CPCY02B20/181Y02B20/00Y02P20/10
Inventor 闫景辉刘伟张清侠张恒龙丹丹
Owner CHANGCHUN UNIV OF SCI & TECH
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