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A phosphor powder with adjustable spectrum suitable for near-ultraviolet excitation and its preparation method

A near-ultraviolet light and phosphor technology is applied in the field of luminescence, which can solve the problems of low energy conversion efficiency and limited application of phosphor powder, and achieve the effects of low cost of raw materials, simple preparation method and easy operation.

Inactive Publication Date: 2020-01-03
INNER MONGOLIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low energy conversion efficiency of phosphors under the excitation of near-ultraviolet LED chips limits their application in white LEDs.

Method used

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  • A phosphor powder with adjustable spectrum suitable for near-ultraviolet excitation and its preparation method
  • A phosphor powder with adjustable spectrum suitable for near-ultraviolet excitation and its preparation method

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preparation example Construction

[0023] A method for preparing a spectrally adjustable phosphate phosphor suitable for excitation by near-ultraviolet light, comprising the steps of:

[0024] (1) According to the chemical formula (Sr 9-x Eu x )(Y 1-y Mg 1.5y )(PO 4 ) 7 The stoichiometric ratio, where x, y are mole fractions, the value range of x: 0.005≤x≤0.30, the value range of y: 0≤y≤0.80, respectively weighed and contained Sr 2+ compounds containing Y 3+ compounds containing Mg 2+ Compounds containing Eu 2+ compounds and containing P 5+ The compound was ground thoroughly in an agate mortar and mixed well to obtain a mixture.

[0025] (2) Put the mixture obtained in step (1) into a corundum crucible, put it into a high-temperature furnace for roasting under a reducing atmosphere, the roasting temperature is 1200-1400° C., and the roasting time is 3-5 hours.

[0026] (3) The sintered body obtained in step (2) is naturally cooled, taken out, ground and pulverized.

[0027] The containing Sr 2+ and ...

Embodiment 1

[0031] (Sr 8.95 Eu 0.05 )Y(PO 4 ) 7 Phosphor powder preparation.

[0032] Weigh SrCO according to stoichiometric ratio 3 : 0.9249 g, Y 2 o 3 : 0.0779 g, NH 4 h 2 PO 4 :0.5636g, Eu 2 o 3 : 0.0062 grams, after mixing and grinding evenly in an agate mortar, put into a corundum crucible, place in a high-temperature furnace, sinter 4 hours at a temperature of 1300 ° C under a hydrogen reducing atmosphere, and grind after natural cooling to obtain (Sr 8.95 Eu 0.05 )Y(PO 4 ) 7 Phosphor.

Embodiment 2

[0034] (Sr 8.95 Eu 0.05 )(Y 0.8 Mg 0.3 )(PO 4) 7 Phosphor powder preparation.

[0035] Weigh SrCO according to stoichiometric ratio 3 : 0.9249 g, Y 2 o 3 : 0.0632 g, NH 4 h 2 PO 4 :0.5636g, Eu 2 o 3 : 0.0062 grams, MgO: 0.0085 grams, after mixing and grinding in an agate mortar, put it into a corundum crucible, place it in a high-temperature furnace, sinter at 1300 ° C for 4 hours under a hydrogen reducing atmosphere, and grind it after natural cooling. That is to say (Sr 8.95 Eu 0.05 )(Y 0.8 Mg 0.3 )(PO 4 ) 7 Phosphor.

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Abstract

The invention discloses spectral adjustable fluorescent powder applicable to near ultraviolet excitation and a preparation method of the fluorescent powder and belongs to the technical field of luminescence. The fluorescent powder has a chemical formula of (Sr9-xEux)(Y1-yMg1.5y)(PO4)7, wherein x and y represent mole fractions; the value of x is more than or equal to 0.005 and less than or equal to 0.30; and the value of y is more than or equal to 0 and less than or equal to 0.80. The phosphate based fluorescent powder (Sr9-xEux)(Y1-yMg1.5y)(PO4)7 is synthesized through a high temperature solid state method. The fluorescent powder has excellent absorption in an excitation wavelength range of 200-480nm, the luminescent wavelength is located in a range of 425-750nm, and the fluorescence spectrum is controllable. The fluorescent powder disclosed by the invention takes phosphate as a matrix, and is low in raw material cost, pollution-free, simple in preparation method, easy to operate and suitable for industrial production.

Description

technical field [0001] The invention relates to a phosphor powder with adjustable spectrum suitable for near-ultraviolet excitation and a preparation method thereof, belonging to the technical field of light emission. Background technique [0002] White light-emitting diode is a new type of solid-state lighting source. Compared with traditional lighting sources, it has the advantages of high efficiency, energy saving, environmental protection, green lighting, and long life. It is called the green light source of the 21st century. [0003] Usually blue LED chip and YAG:Ce 3+ The combination of yellow phosphors produces a color scheme of white light. Such a combination is easy to manufacture, has the lowest cost and the highest efficiency among all combinations of white light LEDs, mature preparation technology, and stable products. However, the obtained white LED spectrum lacks the red spectrum part, which makes the light source have low color rendering index and high color...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/81
CPCC09K11/7795C09K11/7796
Inventor 董晓玲乔君任智辉
Owner INNER MONGOLIA UNIVERSITY