Blue fluorescent powder and preparation thereof

A blue phosphor, general technology, applied in the field of materials, can solve problems such as thermal aging

Inactive Publication Date: 2009-08-05
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The trichromatic lamp also chooses the molecular formula as BaMgAl 10 o 17 :Eu 2+ blue phosphor (BAM), but there is a heat aging problem in the process of baking the tube

Method used

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  • Blue fluorescent powder and preparation thereof
  • Blue fluorescent powder and preparation thereof
  • Blue fluorescent powder and preparation thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] To prepare the general formula Mg 1-x-y Sr y al 2 o 4 :Eu x The blue phosphor 10g represented is an example, where x is the number of moles of europium atoms, y is the number of moles of strontium atoms, x is 0.02, and y is 0.10. The raw materials used and their preparation methods are as follows:

[0033] 1. Raw material pretreatment

[0034] Strontium carbonate and europium oxide were pre-fired in a high-temperature furnace at 850°C for 2 hours to remove moisture and impurities.

[0035] 2. Ingredients

[0036] According to the general formula Mg 0.88 Sr 0.10 al 2 o 4 :Eu 0.02 1.0392g of strontium carbonate, 6.0173g of basic magnesium carbonate, 10.9824g of aluminum hydroxide, 0.2478g of europium oxide were weighed, and the flux was 0.5g of boric acid, and ground in a mortar for 20 minutes to prepare a raw material mixture.

[0037] 3. Sintering

[0038] The raw material mixture was put into a corundum crucible, placed in a high-temperature furnace, and si...

Embodiment 2

[0044] To prepare the general formula Mg 1-x-y Sr y al 2 o 4 :Eu x The blue phosphor 10g represented is an example, where x is the number of moles of europium atoms, y is the number of moles of strontium atoms, x is 0.02, and y is 0.10. The raw materials used and their preparation methods are as follows:

[0045] In batching step 2, according to the general formula Mg 0.88 Sr 0.10 al 2 o 4 :Eu 0.02 Take by weighing strontium carbonate, basic magnesium carbonate, aluminum hydroxide, europium oxide respectively, consumption is identical with embodiment 1, flux is 0.1g boric acid, other steps of this step are identical with embodiment 1, are prepared into raw material mixture; In step 3, the raw material mixture is put into a corundum crucible, placed in a high-temperature furnace, and sintered in activated carbon at 1300° C. for 7 hours. After the reaction is completed, it is naturally cooled to room temperature. Other steps are the same as in Example 1 to prepare blue ...

Embodiment 3

[0047] To prepare the general formula Mg 1-x-y Sr y al 2 o 4 :Eu xThe blue phosphor 10g represented is an example, where x is the number of moles of europium atoms, y is the number of moles of strontium atoms, x is 0.02, and y is 0.10. The raw materials used and their preparation methods are as follows:

[0048] In batching step 2, according to the general formula Mg 0.88 Sr 0.10 al 2 o 4 :Eu 0.02 Take by weighing strontium carbonate, basic magnesium carbonate, aluminum hydroxide, europium oxide respectively, consumption is identical with embodiment 1, flux is 0.7g boric acid, other steps of this step are identical with embodiment 1, are prepared into raw material mixture; In step 3, the raw material mixture is put into a corundum crucible, placed in a high-temperature furnace, and sintered in activated carbon at 1500° C. for 3 hours. After the reaction is completed, it is naturally cooled to room temperature. Other steps are the same as in Example 1 to prepare blue p...

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Abstract

A blue-fluorescence powder comprises a material with a general formula of Mg (1-x-y) SryAl2O4: Eux, wherein x is the mole number of europium atom and is less than or equal to 0.005 and more than or equal to 0.10, y is the mole number of strontium atom and is less than or equal to 0.01 and more than or equal to 0.14. A preparation method of the blue-fluorescence powder comprises the following steps of pretreating raw materials, blending, sintering, washing and preparing the blue-fluorescence powder. The blue-fluorescence powder prepared by the preparation method is tested by an X-ray powder diffractometer and a PE spectrofluorimeter and is observed by an environmental scanning electronic microscope, the test and the observation results show that the excitation spectrum of the prepared fluorescence powder adopts a wide band spectrum between 200 nm and 450 nm, the center wavelength of the excitation spectrum is 330 nm, the emission spectrum is a band spectrum positioned between 400 nm and 550 nm under the excitation of 330 nm and 365 nm ultraviolet lights, the center wavelength is 463 nm and is consistent with the spectrum of the common blue fluorescence powder, thereby the fluorescence powder prepared by adopting the preparation method is the blue-fluorescence powder.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to blue fluorescent powder and a preparation method thereof. Background technique [0002] At present, rare earth luminescent materials have become supporting materials in the fields of information display, lighting sources, optoelectronic devices, etc. The high luminous intensity and good microscopic morphology of phosphors can effectively improve the performance of devices. Therefore, the research and development of new fluorescent materials and Applications have always been one of the important research areas in materials chemistry and materials physics. The advancement of modern science and technology constantly puts forward new requirements for luminescent materials. In recent years, plasma display screens have made significant improvements in image quality, resolution, lifespan and power consumption. Plasma display screens have entered the market and become the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 焦桓马强
Owner SHAANXI NORMAL UNIV
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