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Coprecipitation preparation method of rare earth-doped yttrium aluminium garnet fluorescent powder

A technology of yttrium aluminum garnet and rare earth doping, which can be widely used in the field of white light emitting diodes when applied to phosphors, can solve the problems of not being able to improve light decay, brightness and coating performance at the same time, and achieves regular shape and good luminous performance. , the effect of chemical stability

Inactive Publication Date: 2011-06-01
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the disadvantage is that it cannot improve light decay, brightness and coating performance at the same time

Method used

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  • Coprecipitation preparation method of rare earth-doped yttrium aluminium garnet fluorescent powder

Examples

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Effect test

Embodiment 1

[0041] To prepare a molecule is Y 2.95 Al 5 o 12 : Ce 0.05 The rare earth doped yttrium aluminum garnet phosphor, which is prepared as follows:

[0042] Weigh 3.331gY 2 o 3 (4N) and 0.086gCeO 2 (4N) is added into water, and it is heated and dissolved with the concentrated nitric acid of 1ml: 1ml with the volume ratio, is mixed with the first mixed solution that the pH of 0.08mol / l is 6; then adds 18.756gAl (NO 3 ) 3 9H 2 O, make metal ion mixed solution (mother salt solution), in this metal ion mixed solution, Al +3 with Ga +3 The sum of ions is 1.6 times the sum of other metal ions;

[0043] Prepare NHH with a concentration of 1.5mol / l 4 CO 3 solution;

[0044] At room temperature, the mother salt solution was added dropwise (drop rate 5ml / min) to the stirred NH 4 HCO 3 In the solution, keep the pH of the solution at 10 until all precipitates are formed; then wash the precipitates with deionized water and absolute ethanol in turn; obtain a white precipitate pre...

Embodiment 2

[0059] To prepare a molecule is Y 2.90 Al 5.1 o 12 : Ce 0.05 PR 0.05 The rare earth doped yttrium aluminum garnet phosphor, which is prepared as follows:

[0060] Weigh 3.274gY 2 o 3 (4N), 0.086g CeO 2 (4N) and 0.085g Pr 6 o 11 (4N) is added in water, and its volume ratio is 1ml: 1ml concentrated nitric acid heating and dissolving, is mixed with the first mixed solution that the pH value of 0.02mol / l is 6.5; Adds 19.131g Al ( NO 3 ) 3 9H 2 O, make metal ion mixed solution (mother salt solution), Al in this mother salt solution +3 with Ga + The sum of ions of 3 is 1.7 times of the sum of other metal ions;

[0061] Prepare NH with a concentration of 2.5mol / l 4 HCO 3 solution;

[0062] At room temperature, the mother salt solution was added dropwise (drop rate 10ml / min) to the stirred NH 4 HCO 3 In the solution, keep the pH of the ammonium bicarbonate solution at 8 until all precipitates are formed; then wash the precipitates with deionized water and absolute e...

Embodiment 3

[0068] To prepare a molecule is Y 3.10 Al 5 o 12 : Ce 0.13 PR 0.10 The rare earth doped yttrium aluminum garnet phosphor, which is prepared as follows:

[0069] Weigh 3.50gY 2 o 3 (4N), 0.224g CeO 2 (4N) and 0.170g Pr 6 o 11 (4N) is added in water, and it is heated and dissolved with the concentrated nitric acid of 1ml: 1ml with the volume ratio, is mixed with the first mixed solution that the pH value of 0.15mol / l is 7; Then adds 18.756g Al to this mixed solution ( NO 3 ) 3 9H 2 O, make metal ion mixed solution (mother salt solution), Al in this mother salt solution +3 with Ga +3 The sum of ions is 1.5 times the sum of other metal ions;

[0070] Prepare NH with a concentration of 3mol / l 4 HCO 3 solution;

[0071] At room temperature, the mother salt solution was added dropwise (drop rate 1ml / min) to the stirred NH 4 HCO 3 In the solution, keep the pH of the ammonium bicarbonate solution at 9 until all precipitates are formed; then wash the precipitates with...

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Abstract

The invention provides a coprecipitation preparation method of rare earth-doped yttrium aluminium garnet fluorescent powder. The chemical formula of the fluorescent powder is LnaMbO12:Rx,R'y, wherein Ln is at least one of Sc, Y, Pr, Nd, Gd, Dy and Sm; a is more than or equal to 2.8 and less than or equal to 3.2; M is at least one of Al and Ga, and b is more than or equal to 4.9 and less than or equal to 5.1; R is at least one of Ce and Tb, and x is more than or equal to 0.01 and less than or equal to 0.2; and R' is at least one of Pr and Dy, and y is more than or equal to 0 and less than or equal to 0.1. The coprecipitation preparation method comprises the following steps: preparing a metal ion mixed liquid and preparing nano doped cerium yttrium aluminium garnet crystal seeds; adding the crystal seeds and a dispersing agent to a precipitator, thus obtaining a mixed solution; dropwise adding the metal ion mixed liquid into the mixed solution so as to obtain an intermediate product, and carrying out water washing, alcohol leaching and drying on the intermediate product; adding a fluxing agent in the intermediate product, and then roasting under the reducing atmosphere; and carrying out gas stream smashing, impurity removal, drying and grading on a product of roasting, thus obtaining the rare earth-doped yttrium aluminium garnet fluorescent powder. The shape of the product is regular, the particle diameter (d50) of the product is 1-10 mu, and the product has the advantages of stable property and good luminescence performance, and can be effectively excitated by blue light.

Description

technical field [0001] The present invention relates to a method for preparing fluorescent powder that can be effectively excited by ultraviolet light, purple light or blue light, and in particular to a preparation method for co-precipitation of rare earth-doped yttrium aluminum garnet fluorescent powder. Cerium yttrium aluminum garnet (YAG:Ce 3+ ) as seed crystals and co-precipitation method to prepare rare earth-doped yttrium aluminum garnet phosphors, which can be widely used in white light-emitting diodes (LEDs). Background technique [0002] In the 1990s, blue LEDs were successfully developed and commercialized, which started a wide wave of LED applications. Because light-emitting diodes (LEDs) have the advantages of small solidification, low calorific value, energy saving, long life, short response time, environmental protection, planar packaging, and easy development into light, thin and short products, they are widely used in decorative lights, indicator lights, etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 胡章贵龙震陆田野
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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