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Secondary excitation type orange-red fluorescent powder and preparation method thereof
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A secondary excitation and phosphor technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of lack of long-wave emission and long afterglow materials, difficulty in meeting market needs, high manufacturing costs, etc., and achieve rich colors and good reproducibility , low cost effect
Active Publication Date: 2015-04-08
CHONGQING UNIV OF ARTS & SCI +1
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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
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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 under reducing atmosphere, the calcined temperature is 1380°C, and the calcined time is 4h, the target product can be obtained.
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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