Fluorescent powder capable of being effectively excited by blue light and preparation method thereof
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A yellow phosphor, phosphor technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problem of not being able to improve the color rendering index and color temperature well, and achieve a wide range of excitation wavelengths, good luminescence effect, and luminous intensity. improved effect
Active Publication Date: 2010-08-25
瑞金市工业投资发展有限公司
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However, the emission wavelength of this phosphor is about 575nm, which is orange-yellow. Compared with YAG:Ce, a little red component is added, and the color rendering index and color temperature cannot be improved very well.
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Embodiment 1
[0040] Weigh Li according to the molar ratio: Li:Sr:Si:Eu=2:0.995:1:0.005 2 CO 3 , SrCO 3 , SiO 2 , Eu 2 o 3 , the above raw materials are all analytically pure, after mixing the above raw materials evenly, put them into an alumina crucible and bake in air, keep the temperature at 600°C for 6 hours, and then bake at 850°C for 4 hours in a reducing atmosphere. The resulting product is crushed, washed with water, removed of impurities, and dried to obtain the chemical composition of Li 2 Sr 0.995 SiO 4 :0.005Eu 2+ sample. Its excitation spectrum is shown in Figures 1, 3, 5, and 7 in line 1, and its emission spectrum is shown in Figures 2, 4, 6, and 8 in line 1.
Embodiment 2
[0042] According to the molar ratio: Li:Sr:Si:Eu:P=2:0.995:0.9925:0.005:0.01 Weigh Li 2 CO 3 , SrCO 3 , SiO 2 , Eu 2 o 3 , (NH 4 ) 2 HPO 4 , the above raw materials are all analytically pure, after mixing the above raw materials evenly, put them into an alumina crucible and bake in air, keep the temperature at 600°C for 6 hours, and then bake at 850°C for 4 hours in a reducing atmosphere. The resulting product is crushed, washed with water, removed of impurities, and dried to obtain the chemical composition of Li 2 Sr 0.995 (SiO 4 ) 0.9925 (PO 4 ) 0.01 :0.005Eu 2+ sample. Its excitation spectrum is shown in line 2 in Figure 1, and its emission spectrum is shown in line 2 in Figure 2.
Embodiment 3
[0044] Weigh Li according to molar ratio: Li:Sr:Si:Eu:P=2:0.995:0.9775:0.005:0.03 2 CO 3 , SrCO 3 , SiO 2 , Eu 2 o 3 , (NH 4 ) 2 HPO 4 , the above raw materials are all analytically pure, after mixing the above raw materials evenly, put them into an alumina crucible and bake in air, keep the temperature at 600°C for 6 hours, and then bake at 850°C for 4 hours in a reducing atmosphere. The resulting product is crushed, washed with water, removed of impurities, and dried to obtain the chemical composition of Li 2 Sr 0.995 (SiO 4 ) 0.9775 (PO 4 ) 0.03 :0.005Eu 2+ sample. Its excitation spectrum is shown in line 3 in Figure 1, and its emission spectrum is shown in line 3 in Figure 2.
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Abstract
The invention belongs to the technical field of rare earth luminescent materials, and in particular relates to fluorescent powder capable of being effectively excited by blue light and a preparation method thereof. The general formula of chemical compositions of the fluorescent powder is Li2Sr1-z(SiO4)1-0.75x-0.5y(M1O4)x(M2O4)y:zEu2+, wherein M1 refers to P; M2 refers to S; x is more than or equal to 0 and less than or equal to 0.2; y is more than or equal to 0 and less than or equal to 0.3; and z is more than or equal to 0 and less than or equal to 0.01. The preparation method comprises the following steps of: correctly weighing raw materials in a stoichiometric ratio of the general formula, uniformly mixing the raw materials fully, and pre-sintering the raw materials into a high temperate furnace at the temperature of between 400 and 800 DEG C for 1 to 12 hours; and sintering the pre-sintered raw materials in the reducing atmosphere at the temperature of between 700 and 1,000 DEG C for 1 to 10 hours. The fluorescent powder can be effectively excited by the blue light between 400 and 550nm, intense fluorescence-emission of which the main peak is about 580 to 610nm is obtained, and the fluorescent powder can be matched with a blue LED chip and is used for assembling white LEDs. Meanwhile, the fluorescent powder also can be excited by ultraviolet light between 250 and 280nm to emit intense red fluorescence. The fluorescent powder prepared by the invention has stable chemical properties, the preparation process is easily controlled, and the industrial production can be realized by utilizing basic equipment in the current fluorescent powder plants. Therefore, the fluorescent powder is new fluorescent powder with application potential.
Description
technical field [0001] The invention relates to a fluorescent powder that can be effectively excited by blue light and a preparation method thereof, belonging to the technical field of rare earth luminescent materials. Background technique [0002] With the rapid development of light-emitting diode (LED) technology in the past ten years, white LED lighting is known as the successor to incandescent lamps and energy-saving lamps because of its characteristics of "energy saving", "environmental protection", "high efficiency" and "long life". The next generation of green and environmentally friendly lighting sources will tend to replace traditional lighting [1-3] . [0003] The most promising solution for the realization of white LEDs is the combination of LED chips and light-converting phosphors. Because the production technology of blue LED chips is relatively mature at present, the mainstream solution for forming white LEDs is: blue LED + yellow phosphor, which is a combina...
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