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Superfine rare earth magnesium silicate strontium fluorescent powder and preparation technology thereof

A technology of luminescent powder and magnesium strontium silicate, which is applied in the direction of luminescent materials, chemical instruments and methods, can solve the problems of coarse luminescent powder particles, damage to the luminous performance of the powder, and high block hardness, and achieve good dispersion and The effect of uniformity

Inactive Publication Date: 2013-03-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The luminescent powder particles obtained by the above process are relatively coarse, generally above 10 μm, and the sintering temperature is high, and the hardness of the block formed after sintering is high. Vigorous grinding will cause relatively large damage to the luminescent performance of the powder.
Due to the relatively large particle size, it cannot be used in some occasions that require high fineness, which greatly limits the application and development of silicate luminescent materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0014] Weigh 4.106g Sr(NO 3 ) 2 , 2.564g Mg(NO 3 ) 2 ·6H 2 O, 0.062g H 3 BO 3 , 0.018g Eu 2 o 3 , 0.037g Dy 2 o 3 , 4.167g (C 2 h 5 O) 4 Si. Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H 2 O, H 3 BO 3 Dissolve in 30ml deionized water; Eu 2 o 3 , Dy 2 o 3 Dissolve in 30ml HNO 3 solution; will (C 2 h 5 O) 4 Si was dissolved in 25ml absolute ethanol. Mix the above three solutions, control the amount of water added so that the total volume of the solution is about 100ml, add the hydrolysis catalyst HNO to the solution 3 The pH value of the solution was adjusted to 1, and then the solution was stirred on a constant temperature magnetic stirrer, and the stirring temperature was set at 80° C., so that it was fully mixed and a hydrolysis condensation reaction occurred. After the water in the solution evaporated to form a viscous wet gel, it was put into a constant temperature drying oven at 80°C for drying to obtain a white powder xerogel with a loose structure. Put the ...

Embodiment approach 2

[0016] Weigh 4.106g Sr(NO 3 ) 2 , 2.564g Mg(NO 3 ) 2 ·6H 2 O, 0.093g H 3 BO 3 , 0.035g Eu 2 o 3 , 0.075g Dy 2 o 3 , 4.167g (C 2 h 5 O) 4 Si. Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H 2 O, H 3 BO 3 Dissolve in 30ml deionized water; Eu 2 o 3 , Dy 2 o 3 Dissolve in 30ml HNO 3 solution; will (C 2 h 5 O) 4 Si was dissolved in 25ml absolute ethanol. Mix the above three solutions, control the amount of water added so that the total volume of the solution is about 120ml, and add the hydrolysis catalyst HNO to the solution 3 The pH value of the solution was adjusted to 1, and then the solution was stirred on a constant temperature magnetic stirrer, and the stirring temperature was set at 80° C., so that it was fully mixed and a hydrolysis condensation reaction occurred. After the water in the solution evaporates to form a viscous wet gel, put it into a constant temperature drying oven at 100°C for drying to obtain a white powder xerogel with a loose structure. Put the...

Embodiment approach 3

[0018] Weigh 4.106g Sr(NO 3 ) 2 , 2.564g Mg(NO 3 ) 2 ·6H 2 O, 0.124g H 3 BO 3 , 0.070g Eu 2 o 3 , 0.075g Dy 2 o 3 , 4.167g (C 2 h 5 O) 4 Si. Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H2 O, H 3 BO 3 Dissolve in 30ml deionized water; Eu 2 o 3 , Dy 2 o 3 Dissolve in 30ml HNO 3 solution; will (C 2 h 5 O) 4 Si was dissolved in 25ml absolute ethanol. Mix the above three solutions, control the amount of water added so that the total volume of the solution is about 150ml, add a hydrolysis catalyst HNO3 to the solution to adjust the pH value of the solution to 1, then place the solution on a constant temperature magnetic stirrer for stirring, and set the stirring temperature to 80 ℃, make it fully mixed and the hydrolysis condensation reaction occurs. After the water in the solution evaporates to form a viscous wet gel, it is put into a constant temperature drying oven at 120°C for drying to obtain a white powder xerogel with a loose structure. Put the obtained xerogel i...

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Abstract

The invention relates to a superfine rare earth magnesium silicate strontium fluorescent powder and a preparation technology thereof. The superfine rare earth magnesium silicate strontium fluorescent powder is characterized in that the fluorescent power takes Sr2MgSi2O7 as a matrix, and Eu<2+> and Dy<3+> rare earth ions as activating agents, a crystal structure is a tetragonal system akermanite structure, the grain size of the powder is less than 5mu m, and the powder can emit blue visible lights with the wavelength of about 470nm after irradiated by ultraviolet or visible lights for 1-10 minutes, and the afterglow service life of the powder reaches above 5 hours. The fluorescent powder is nontoxic, harmless and free of radioactive contamination and has no adverse effect on human bodies and the environment. The main preparation processes of the superfine fluorescent power are as follows: a rare earth magnesium silicate strontium precursor and xerogel are prepared through a sol-gel technology, and then a rare earth magnesium silicate luminescent material is obtained through high-temperature roasting, and the superfine fluorescent powder with the grain size of less than 5mu m is obtained by smashing and grinding the luminescent material.

Description

technical field [0001] The invention relates to the field of preparation of rare earth long afterglow luminescent materials, in particular to an ultrafine (<5 μm) rare earth magnesium strontium silicate long afterglow luminescent powder and its preparation technology. Background technique [0002] Long-lasting luminescent materials are commonly known as luminous powders, which can last in dark environments after being excited by light of a specific wavelength (such as ultraviolet light or visible light, etc.). Due to their energy storage and luminescent behavior, they can be used to make luminescent paint, luminescent plastic, luminescent fiber, luminescent paper, etc., and are widely used in architectural decoration, military facilities, transportation, fire emergency and other fields. There are three main categories of long-lasting luminescent materials currently in use: one is the traditional sulfide series long-lasting luminescent materials, the other is the aluminate...

Claims

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Application Information

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IPC IPC(8): C09K11/59
Inventor 罗军高大海张开砚
Owner JIANGNAN UNIV
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