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Secondary excitation type orange-red fluorescent powder and preparation method thereof

A secondary excitation, phosphor technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of lack of long-wave emission and long afterglow materials, difficult to meet market needs, high manufacturing costs, and achieve rich colors and good reproducibility , the effect of low cost

Active Publication Date: 2012-10-10
CHONGQING UNIV OF ARTS & SCI +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of many patented phosphors in the past has disadvantages such as large pollution and high manufacturing cost, and now Eu 2+ Aluminate system and silicate system long afterglow luminescent materials lack long-wave emission and long afterglow materials, which are difficult to meet market needs. Therefore, it is necessary to develop new long-wavelength afterglow luminescent materials with high performance and richer colors

Method used

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  • Secondary excitation type orange-red fluorescent powder and preparation method thereof
  • Secondary excitation type orange-red fluorescent powder and preparation method thereof
  • Secondary excitation type orange-red fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] According to the structural formula Sr 0.86 Ca 0.92 Al 1.96 Zn 0.02 Si 0.04 o 4 S:0.08Eu 2+ ,0.06Dy 3+ ,0.06Tm 3+ Weigh out SrCO 3 (A.R.) 0.086mol, CaCO 3 (A.R.)0.092mol, Al 2 o 3 (A.R.)0.098mol, ZnCO 3 (A.R.) 0.002mol, SiO 2 (A.R.)0.004mol, Eu 2 o 3 (A.R.)0.004mol, Dy 2 o 3 (A.R.)0.003mol and Tm 2 o 3 (A.R.) 0.003mol, then weigh the flux H of 5wt% of the total mass of the above drugs 3 BO 3 Mix the above weighed raw materials evenly, and then calcinate under the reducing atmosphere provided by the combustion of activated carbon powder, the calcining temperature is 1200°C, and the calcining time is 6h, to obtain the target product.

Embodiment 2

[0020] According to the structural formula Sr 0.97 Ca 0.97 Al 1.96 Mg 0.02 Ga 0.04 o 4 S:0.02Eu 2+ ,0.01Dy 3+ ,0.01Tm 3+ Weigh out SrCO 3 (A.R.) 0.097mol, CaCO 3 (A.R.)0.097mol, Al 2 o 3 (A.R.)0.098mol, MgCO 3 (A.R.)0.002mol, Ga 2 o 3 (A.R.)0.002mol, Eu 2 o 3 (A.R.)0.001mol, Dy 2 o 3 (A.R.)0.0005mol and Tm 2 o 3 (A.R.) 0.0005mol, and then respectively weigh the flux BaF of 3wt% of the total mass of the above drugs 2 ; Mix the above-mentioned raw materials weighed uniformly, then in H 2 -N 2 (Volume ratio 5:95) calcined in a reducing atmosphere, the calcined temperature is 1380°C, and the calcined time is 4h to obtain the target product.

Embodiment 3

[0022] According to the structural formula Sr 0.90 Ca0.88 Al 1.92 Cd 0.06 Ge 0.08 o 4 S:0.04Eu 2+ ,0.06Dy 3+ ,0.06Tm 3+ Weigh out SrCO 3 (A.R.) 0.09mol, CaCO 3 (A.R.)0.088mol, Al 2 o 3 (A.R.)0.096mol, CdCO 3 (A.R.) 0.006mol, GeO 2 (A.R.)0.004mol, Eu 2 o 3 (A.R.)0.002mol, Dy 2 o 3 (A.R.)0.003mol and Tm 2 o 3 (A.R.) 0.003mol, then respectively take by weighing the flux NaF of 0.5wt% of the total mass of the above medicines; 2 -N 2 (Volume ratio 10:90) calcined under reducing atmosphere, the calcined temperature is 1500°C, and the calcined time is 2h, the target product can be obtained.

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Abstract

The invention relates to secondary excitation type orange-red fluorescent powder and a preparation method thereof, belonging to the technical field of luminescent materials. The fluorescent powder is Sr1-a-bCa1-x-cAl2-yMexREyO4S:aEu<2+>,bDy<3+> and cTm<3+>, where Me is at least one of Zn, Cd, Mg, RE is at least one of Ga, Zn, Ge, and Si, 0<x<0.1,0<y<0.2, 0<a<0.12, 0<b<0.1, and 0<c<0.1. The design idea is that: Eu<2+> and Tm<3+> are taken as a luminescent center and Dy<3+> and the like are added to be taken as an auxiliary excitant; the light of the Eu<2+> and Tm<3+> interacts; incident light from outside excitates Eu<2+> to emit light which excitates Tm<3+> to emit light again to form a secondary excitation type light emission; the relative ratio of Eu<2+> to Tm<3+> determines the color of the emitted light; and the concentration of Dy<3+> determines the afterglow time of the secondary excitation long-afterglow fluorescent powder. The preparation method comprises the following steps: weighing each oxide raw material according to the ratio of each element in the structural formula, adding a fluxing agent into the raw materials and uniformly mixing the mixture by ball milling, placing the obtained product in a reducing atmosphere for calcinations, and crushing and screening the obtained product to obtain the required fluorescent powder. The secondary excitation type orange-red fluorescent powder can emit orange-red fluorescent light, and the afterglow time can reach 8 to 12 h.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a secondary excitation type orange-red fluorescent powder and a preparation method thereof. technical background [0002] Long-lasting luminescent materials are an important class of photo-induced energy storage functional materials, which are energy-saving and recyclable. This kind of material is widely used in many aspects of industrial and agricultural production, military affairs, fire protection and people's life. Long afterglow luminescent material is a special kind of thermoluminescent material, and it is also a thermoluminescent material at room temperature. For such electron-trapping materials, the luminescence phenomenon is caused by the trap level structure in the material. According to the general mechanism of long-lasting luminescence, long-lasting luminescence can be produced as long as a certain density of trap energy levels that can rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64C09K11/66
Inventor 韩涛朱达川蒲勇彭玲玲曹仕秀涂铭旌张进
Owner CHONGQING UNIV OF ARTS & SCI
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