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Divalent manganese ion activated fluorescent powder, a preparing method thereof and applications of the fluorescent powder

A technology of divalent manganese ions and phosphors, applied in the field of phosphors, can solve the problems of easy high-temperature oxidation, high cost, complicated reaction operations and the like of fluorescent materials, and achieve the effects of easy promotion, low cost and high purity

Active Publication Date: 2017-05-10
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The first object of the present invention is to provide a method for preparing phosphors activated by divalent manganese ions, which can produce phosphors by reacting in a non-reducing atmosphere, and realize tetravalent manganese by direct calcination under air conditions. ions to divalent manganese ions, and obtain activated phosphors with divalent manganese ions, thus solving the problem that the preparation of phosphors in the prior art must be carried out in a reducing atmosphere, the reaction operation is complicated and the cost is high, and the prepared The obtained fluorescent material is easy to be oxidized at high temperature and other technical problems

Method used

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  • Divalent manganese ion activated fluorescent powder, a preparing method thereof and applications of the fluorescent powder
  • Divalent manganese ion activated fluorescent powder, a preparing method thereof and applications of the fluorescent powder
  • Divalent manganese ion activated fluorescent powder, a preparing method thereof and applications of the fluorescent powder

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Take by weighing 0.005mol purity and be 99.9% sodium carbonate, (0.01-x) mol purity be the zinc oxide of 99.9%, 0.03mol purity be the ammonium dihydrogen phosphate of 99.5%, (x) mol purity be the manganese dioxide of 99.99% , where x is 0.00001~0.0017.

[0046] Put the above raw materials into a mortar and grind them evenly, put them into a corundum crucible and a platinum crucible respectively, put the crucible in a muffle furnace, raise it from room temperature to 500°C at a rate of 4°C / min, and heat it at 500°C Keep the temperature constant for 24 hours, then cool down to room temperature naturally. Take out the sample and place it in an agate mortar and grind it fully again, put it back into the crucible, put it in a muffle furnace, heat it to 800°C, keep the temperature constant for 48 hours, take it out and grind it again evenly after cooling down naturally. Both crucibles can get the white target product NaZn 1-x (PO 3 ) 3 :xMn 2+ (x=0.001~0.17) powder.

[...

Embodiment 2

[0049] Take by weighing 0.005mol purity and be 99.9% sodium carbonate, (0.01-x) mol purity be the magnesium oxide of 99.9%, 0.03mol purity be the ammonium dihydrogen phosphate of 99.5%, (x) mol purity be the manganese dioxide of 99.99% , where x is 0.00001~0.0017.

[0050] Put the above raw materials into a mortar and grind them evenly, then put them into a corundum crucible and a platinum crucible respectively, place the crucible in a muffle furnace, raise it from room temperature to 500°C at a rate of 4°C / min, and keep the temperature at 500°C 24 hours, then cool down to room temperature naturally. Take out the sample and place it in an agate mortar and grind it fully again, put it back into the crucible, put it in a muffle furnace, heat it to 800°C, keep the temperature constant for 48 hours, take it out and grind it again evenly after cooling down naturally. Both crucibles can get the white target product NaMg 1-x (PO 3 ) 3 :xMn 2+ (x=0.001~0.17) powder.

[0051] The...

Embodiment 3

[0053] Take by weighing 0.01mol purity be the lithium carbonate of 99.9%, (0.01-x) mol purity is the zinc oxide of 99.9%, 0.01mol purity is the ammonium dihydrogen phosphate of 99.5%, (x) mol purity is the manganese dioxide of 99.99% , where x is 0.00001~0.0016.

[0054] Put the above raw materials into a mortar and grind them evenly, then put them into a corundum crucible and a platinum crucible respectively, place the crucible in a muffle furnace, raise it from room temperature to 500°C at a rate of 4°C / min, and keep the temperature at 500°C 24 hours, then cool down to room temperature naturally. Take out the sample and place it in an agate mortar and grind it fully again, put it back into the crucible, put it in a muffle furnace, heat it to 800°C, keep the temperature constant for 48 hours, take it out and grind it again evenly after cooling down naturally. Both crucibles can get the white target product LiZn 1-x PO 4 :xMn 2+ (x=0.001~0.16) powder.

[0055] Then, to th...

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Abstract

Divalent manganese ion activated fluorescent powder, a preparing method thereof and applications of the fluorescent powder are disclosed. Alkali metal carbonate, zinc oxide or magnesium oxide, manganese dioxide and ammonium biphosphate are adopted as raw materials in the method. The raw materials are fully ground after being weighed according to a stoichiometric ratio, are put into a muffle furnace and are subjected to low-temperature primary pre-sintering and high-temperature secondary sintering, a three-dimensional net structure having special rigidity of a matrix compound is utilized to achieve self-reduction of tetravalent manganese ions into divalent manganese ions in a non-reducing atmosphere, and the inorganic phosphate red and yellow fluorescent powder is obtained. The fluorescent powder can be applied for red and yellow fluorescent powder for warm white LEDs. Self-reduction of the tetravalent manganese ions into the divalent manganese ions is achieved through direct sintering under air conditions. The raw materials are simple, easily available and low in cost. The preparing process is simple. The prepared red and yellow fluorescent powder cannot be oxidized in high-temperature environment, and chromaticity coordinates do not be offset. The method is a method of preparing the divalent manganese ion activated fluorescent powder through manganese ion self-reduction.

Description

technical field [0001] The invention relates to the technical field of fluorescent powder, in particular to a divalent manganese ion activated fluorescent powder, a preparation method and an application. Background technique [0002] Photoluminescence refers to the phenomenon that objects rely on external light sources to irradiate and obtain energy, thereby exciting the luminescent material to cause luminescence. Ultraviolet light, visible light and infrared radiation can all trigger photoluminescence. The fourth-generation green lighting source LED (photoluminescent diode) is made using the principle of photoluminescence (Xu Shurong, Su Mianzeng, "Luminescence and Luminescent Materials", Chemical Industry Press, 2004). [0003] At present, white light LEDs are mainly obtained through three-primary color LED color mixing method and light conversion method. Among them, light conversion white light LED is the mainstream scheme of white light lighting in the world at this stag...

Claims

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Application Information

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IPC IPC(8): C09K11/70H01L33/50
CPCC09K11/703H01L33/504
Inventor 武莉孙少君张毅
Owner NANKAI UNIV
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