Low temperature preparation method of yttrium aluminum garnet rare earth phosphor powder

The technology of rare earth phosphor and yttrium aluminum garnet is applied in the field of materials to achieve the effects of low sintering temperature, good luminescence performance and easy mixing evenly

Inactive Publication Date: 2009-12-09
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the above phosphor preparation method, and provide a yttrium aluminum garnet rare earth phosphor with low sintering temperature, uniform distribution of phosphor particles, smooth surface and controllable particle size. Low temperature preparation method

Method used

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  • Low temperature preparation method of yttrium aluminum garnet rare earth phosphor powder
  • Low temperature preparation method of yttrium aluminum garnet rare earth phosphor powder
  • Low temperature preparation method of yttrium aluminum garnet rare earth phosphor powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] To prepare with general formula Y 2.96 Ce 0.04 Al 5 o 12 (M in the general formula is Ce 3+ , x is 0.04, and y is 0) the rare earth phosphor 10g that represents is example, used raw material and preparation method thereof are as follows:

[0030] 1. Pretreatment of raw materials

[0031] Pre-fire the yttrium oxide in a high-temperature furnace at 850°C for 2 hours to remove the moisture in it.

[0032] 2. Ingredients

[0033] According to formula Y 2.96 Ce 0.04 Al 5 o 12 Carry out batching, in the formula M is Ce 3+ , x is Ce 3+ The number of moles, x is 0.04, weigh 5.610g Y 2 o 3 Dissolve with nitric acid in a beaker and mix with 34.490g Al(NO 3 ) 3 9H 2 O, 0.220gCe(NO 3 ) 3 Mix to prepare a mixed solution. Adjust the pH of the mixed solution to 4-6 with a solution with a volume ratio of ammonia water and absolute ethanol of 1:5, add citric acid whose mass is 8 times the total amount of raw materials, and stir at 60-100°C for 1-2 hours to form a light ...

Embodiment 2

[0037] To prepare with general formula Y 2.94 Tb 0.06 Al 5 o 12 (M in the general formula is Tb 3+ , x is 0.06, and y is 0) the rare earth phosphor 10g that represents is example, used raw material and preparation method thereof are as follows:

[0038] In batching step 2, according to the general formula Y 2.94 Tb 0.06 Al 5 o 12 For batching, M is Tb in the formula 3+ , x is Tb 3+ The number of moles, x is 0.06, weigh 5.560g Y 2 o 3 Dissolve with nitric acid in a beaker and mix with 31.480gAl(NO 3 ) 3 9H 2 O, 0.350g Tb(NO 3 ) 3 Mix to prepare a mixed solution. Other steps in this step are the same as in Example 1, and a fluffy slightly yellowish precursor is obtained. Other steps are identical with embodiment 1, prepare Y 2.94 Tb 0.06 Al 5 o 12 Green phosphor, the prepared Y 2.94 Tb 0.06 Al 5 o 12 The green fluorescent powder is tested with a fluorescence spectrometer, and the excitation and emission spectrograms are shown in figure 1 , the surface m...

Embodiment 3

[0040] To prepare with general formula Y 2.94 Tb 0.06 Al 4.7 Ga 0.3 o 12 (M in the general formula is Tb 3+ , x is 0.06, and y is 0.3) the rare earth phosphor 10g that represents is example, used raw material and preparation method thereof are as follows:

[0041] In batching step 2, according to the general formula Y 2.94 Tb 0.06 Al 4.7 Ga 0.3 o 12 For batching, where y is Ga 3+ The number of moles, y is 0.3, weigh 5.440gY 2 o 3 and 0.460gGa 2 o 3 Dissolve with nitric acid in a beaker and mix with 28.870gAl(NO 3 ) 3 9H 2 O, 0.340g Tb(NO 3 ) 3 Mix to prepare a mixed solution. Other steps in this step are the same as in Example 1. Other steps are identical with embodiment 1, prepare Y 2.94 Tb 0.06 Al 4.7 Ga 0.3 o 12 Green phosphor, the prepared Y 2.94 Tb 0.06 Al 4.7 Ga 0.3 o 12 The green fluorescent powder is tested with a fluorescence spectrometer and a cathode ray spectrometer, and the excitation and emission spectrograms are shown in Figure 5 ...

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Abstract

The invention relates to a low temperature preparation method of yttrium aluminum garnet rare earth phosphor powder. The rare earth phosphor powder is formed by material expressed by a general formula Y3-xMxAl5-yGayO12, wherein M is Ce or Tb or Ce and Gd, x is molar number of M and is more than or equal to 0.01 and less than or equal to 0.08, y is molar number of Ga and is more than or equal to 0 and less than or equal to 0.8, and the preparation method thereof comprises pretreatment of raw materials, mixing, sintering and the like. The raw material is easy to be evenly mixed and sintering temperature is low during preparation in the invention. The prepared phosphor powder has high brightness, spherical or near spherical shape, controllable powder particle size, even powder particle surface and good luminous performance through test; and the wavelength of emitting light thereof is not changed so as to greatly improve screen coating effect and luminous performance of devices when being applied to different devices, thus being applicable to field emission displays, projection televisions and LED devices, flying-spot scanning displays and the fields with high requirement on screen coating effect, luminous brightness and luminous efficiency of the phosphor powder.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a method for preparing yttrium aluminum garnet rare earth fluorescent powder at low temperature. Background technique [0002] Rare earth luminescent materials have become supporting materials in information display, lighting source, optoelectronic devices and other fields. Phosphor powder with high luminous intensity, good microscopic morphology and suitable particle size can effectively improve the performance of devices. Rare earth doped Y 3 Al 5 o 12 Phosphor powder is widely used in color field emission display devices, projection TV, Head-up Display, LED, etc. due to its good chemical and thermal stability. The preparation method of phosphor is the determining factor of phosphor luminous intensity, microscopic morphology and particle size, and has become a hot spot in materials science research. At present, the preparation methods of phosphor mainly includ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 焦桓刘振武巧莉王宜斌
Owner SHAANXI NORMAL UNIV
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