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A kind of eu3+ activated sodium magnesium orthosilicate red fluorescent powder and its preparation method and application
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A technology of red fluorescent powder and sodium magnesium silicate, which is applied in chemical instruments and methods, luminescent materials, electrical components, etc., to achieve the effect of low production cost, low price and easy operation
Active Publication Date: 2018-08-07
肇庆市华大电子科技有限公司
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Although Eu 3+ There are many reports on doped silicate red phosphors, but Eu 3+ Doped with Na 2 MgSiO 4 Red phosphor has not been reported so far
Method used
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Embodiment 1
[0031] Prepare Na 2 MgSiO 4 :0.01Eu 3+
[0032] According to the chemical formula Na 2 MgSiO 4 :0.01Eu 3+ The stoichiometric ratio of each element in the 2 CO 3 : 2.0075 grams, 4MgCO 3 ·Mg(OH) 2 ·5H 2 O: 1.8213 g, SiO 2 : 1.1379 grams, Eu 2 O 3 : 0.0333 grams. After grinding and mixing uniformly in an agate mortar, it is calcined for the first time in an air atmosphere at a temperature of 450°C for 5 hours, and then naturally cooled to room temperature, and the sample is taken out. Grind and mix the mixture evenly after the first calcination, and calcine the second time in an air atmosphere at a calcination temperature of 950°C and a calcination time of 6 hours, and then naturally cool to room temperature to obtain the target product.
[0033] figure 1 It is the X-ray powder diffraction pattern of the phosphor prepared in this example. XRD test results show that the main phase of the prepared material is Na 2 MgSiO 4 material.
[0034] figure 2 It is the excitation spectrum of the...
Embodiment 2
[0037] Prepare Na 2 MgSiO 4 :0.15Eu 3+
[0038] According to the chemical formula Na 2 MgSiO 4 :0.15Eu 3+ The stoichiometric ratio of each element in the weight of NaOH: 1.4777 g, Mg(OH) 2 : 0.3663 g, SiO 2 :2.2195 grams, Eu(NO 3 ) 3 : 0.9364 grams. After grinding and mixing uniformly in an agate mortar, it is calcined for the first time in an air atmosphere at a temperature of 300°C and a calcining time of 8 hours, then it is naturally cooled to room temperature and the sample is taken out. The mixture after the first calcination is ground and mixed uniformly, and the second calcination is performed in an air atmosphere with a calcination temperature of 900°C and a calcination time of 7 hours, and then natural cooling to room temperature to obtain the target product. Its main structure, excitation spectrum and emission spectrum are similar to those of Example 1.
Embodiment 3
[0040] Prepare Na 2 MgSiO 4 : 0.2Eu 3+
[0041] According to the chemical formula Na 2 MgSiO 4 : 0.2Eu 3+ The stoichiometric ratio of each element in the chemistry, respectively weighing NaNO 3 :1.8179g, Mg(NO 3 ) 2 : 0.7678 g, SiO 2 : 1.2851 grams, Eu 2 O 3 : 1.1291 grams. After grinding and mixing uniformly in an agate mortar, it is calcined for the first time in an air atmosphere at a temperature of 500°C for 3 hours, and then naturally cooled to room temperature, and the sample is taken out. The mixture after the first calcination is ground and mixed uniformly, and the second calcination is performed in an air atmosphere with a calcination temperature of 1000° C. and a calcination time of 5 hours, and then natural cooling to room temperature to obtain the target product. Its main structure, excitation spectrum and emission spectrum are similar to those of Example 1.
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Abstract
The invention relates to Eu<3+> activated magnesium and sodium orthosilicate red fluorescent powder. The chemical formula of the Eu<3+> activated magnesium and sodium orthosilicate red fluorescent powder is Na2Mg<1-x>Eu<x>SiO4, wherein the x is Eu<3+>-doping mole percentage, and the x is greater than or equal to 0.0001 but smaller than or equal to 0.5; a high-temperature solid-phase method or a chemical solution method is used for preparing the magnesium and sodium orthosilicate red fluorescent powder. The Eu<3+> activated magnesium and sodium orthosilicate red fluorescent powde has the beneficial effects that the prepared red fluorescent powder can give out red light with the main peak being 622 nanometers under the excitation of 250 to 490nm of ultraviolet to blue light; the red color degree is pure; the output wavelength matching performance with a near ultraviolet LED (light emitting diode) chip and a blue light LED chip is good; the Eu<3+> activated magnesium and sodium orthosilicate red fluorescent powder can be applied to the field of white light LED; the raw material resources are rich; the price is low; the preparation process is simple; the operation is easy; the requirement on the equipment is low; the production cost of a product is low; no waste water and no water gas is discharged in the production; green and environment-friendly effects are achieved; high thermal stability, good color rendering property and great granularity are realized; the preparation of high-power LEDs can be favorably realized.
Description
Technical field [0001] The invention belongs to the technical field of phosphors for light emitting diodes (LEDs) in the field of lighting and display, and relates to a Eu 3+ Activated sodium magnesium orthosilicate red phosphor and preparation method and application thereof. Background technique [0002] As the fourth-generation lighting source after incandescent lamps, fluorescent lamps and high-pressure gas discharge lamps, white light LED (Light Emitting Diode) has many advantages such as non-toxic, high efficiency and energy saving, long life, good shock resistance and safety, and is a kind of environmental protection. , Energy-saving green lighting source, known as the most valuable new light source in the 21st century, has huge application prospects in the field of lighting and display. [0003] At present, the most important thing to realize white LED lighting is to use ultraviolet light, near-ultraviolet light or blue LED chip to add phosphors, and the light emitted by the...
Claims
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