Method for preparing manganese-doped double-perovskite red fluorescent powder
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A technology of red fluorescent powder and double perovskite, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of difficult control of sample particle size, high calcination temperature, and high production cost, so as to facilitate large-scale industrial production, The effect of lowering the calcination temperature and lowering the production cost
Active Publication Date: 2018-11-06
JIANGXI UNIV OF SCI & TECH
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Problems solved by technology
The sol-gel method can achieve doping at the molecular level, and the sintering temperature is relatively low (1300°C), but the reaction cycle is long, requiring several days, and high-temperature calcination is required
The composition of the sample synthesized by the co-precipitation method is relatively uniform, and segregation of the composition rarely occurs, but the particle size of the sample is not easy to control, the process is more complicated, and a subsequent high-temperature calcination stage is also required
The high-temperature solid-phase method has the advantages of simple operation, short reaction cycle, and easy industrial production. However, the calcination temperature for synthesizing the oxide is relatively high (1400°C), which leads to high production costs. At the same time, the particle size of the sample prepared at high temperature is too large. , seriously affecting its luminous efficiency
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Embodiment 1
[0034] Weigh 16.2905g La2O3, 2.0152g MgO, 3.9735g TiO2, 0.0287g MnCO3, and an appropriate amount of NaCl, grind the above raw materials evenly, put them into a high-temperature furnace, heat evenly from room temperature to 800°C, keep warm for 12 hours, and then cool naturally to room temperature, and wash the product with an appropriate amount of absolute ethanol two to three times, dry in an oven, and cool to room temperature naturally, the composition is La2Mg(Ti0.995Mn0.005)O6.
Embodiment 2
[0036] Weigh 11.2905g Y2O3, 2.0152g MgO, 3.9735g TiO2, 0.0287g MnCO3, and an appropriate amount of LiCl, grind the above raw materials evenly, put them into a high-temperature furnace, heat evenly from room temperature to 1000°C, keep warm for 12 hours, and then cool naturally to room temperature, and wash the product with an appropriate amount of absolute ethanol two to three times, dry in an oven, and naturally cool to room temperature, the composition is Y2Mg(Ti0.995Mn0.005)O6.
Embodiment 3
[0038]Weigh 16.2905g La2O3, 4.0690g ZnO, 3.9735g TiO2, 0.0287g MnCO3, and an appropriate amount of KCl, grind the above raw materials evenly, put them into a high-temperature furnace, heat evenly from room temperature to 900°C, keep warm for 12 hours, and then cool naturally After reaching room temperature, add an appropriate amount of absolute ethanol to wash the product two to three times, dry it in an oven, and cool it naturally to room temperature to obtain the composition La2Zn(Ti0.995Mn0.005)O6.
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Abstract
The invention relates to the technical field of fluorescent powder preparation and in particular relates to a method for preparing manganese-doped double-perovskite red fluorescent powder. According to the method, chlorides (LiCl, NaCl and KCl) are creatively adopted as cosolvents, and the manganese-doped double-perovskite red fluorescent powder is synthesized under the action of the cosolvents. Compared with a calcination temperature of 1400 DEG C in the prior art, a temperature of only 800-1000 DEG C is need in the method, so that the production cost can be greatly reduced; on the other hand, compared with the prior art that the red light emission efficiency is seriously affected as the calcination temperature is reduced, the red light emission efficiency of the method is not reduced while the calcination temperature is reduced, the calcination temperature can be reduced while the red light emission efficiency is ensured, the characteristic is very unique, and as lamp fluorescent powder, the fluorescent powder can be applied to the field of LED (Light Emitting Diode) lighting and plant growth assistance artificial light sources.
Description
technical field [0001] The invention relates to the technical field of phosphor preparation, in particular to a preparation method of a manganese-doped double perovskite red phosphor. Background technique [0002] Because blue light (400-500nm), red light (620-690nm) and near-infrared light (700-740nm) control the photosynthesis, phototropism and photomorphological changes of plants respectively, the light source not only provides the energy needed for plant growth , and also control thousands of reaction processes in plant cells. Because of this, the greenhouse industry, which controls plant growth through different light sources, has been widely developed in agriculture and gardening, and thus meets the different needs of human beings. Among them, blue and red LED lights for plant growth have been widely studied, but near-infrared LEDs are rarely reported. [0003] When in the center of the octahedral structure, the spin-allowed transition of the 4A2 to 4T1 and 4T2 energ...
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