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A kind of fluorescent powder based on ultraviolet light or blue light excitation and its preparation method and application

A technology of blue light excitation and fluorescent powder, which is applied in the field of fluorescent materials, can solve the problems of low luminous efficiency, achieve high luminous intensity, wide range of emission wavelengths, and simple methods

Active Publication Date: 2011-12-14
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of reabsorption between different phosphor powders and low luminous efficiency in order to solve the problem of making white LEDs by mixing phosphor powders in the prior art, and to provide a phosphor powder excited by ultraviolet light or blue light and Its preparation method and application

Method used

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  • A kind of fluorescent powder based on ultraviolet light or blue light excitation and its preparation method and application
  • A kind of fluorescent powder based on ultraviolet light or blue light excitation and its preparation method and application
  • A kind of fluorescent powder based on ultraviolet light or blue light excitation and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A fluorescent powder excited by ultraviolet light or blue light, the chemical formula of the material is: (M 3-x mn x )(R 2-y Ce y )(Si,Ge) 3 o 12 , wherein when M=Ca and Sr in the chemical formula, R=Sc, x=0.1, y=0.0001, the preparation molecular formula is (Ca 2.5 Sr 0.4 mn 0.1 )(Sc 1.9999 Ce 0.0001 )(Si 2.7 Ge 0.3 )O 12 of fluorescent powder.

[0027] Weigh 2.5molCaCO according to molar ratio 3 , 0.4molSrCO 3 , 0.1molMnCO 3 , 0.99995molSc 2 o 3 , 0.0001molCeO 2 , 2.7mol SiO 2 , 0.3molGeO 2 , mixed and ground evenly, placed in a high-purity corundum crucible, placed in a high-temperature tube furnace for roasting under a hydrogen reducing atmosphere, and roasted at 1400°C for 4 hours to obtain (Ca 2.5 Sr 0.4 mn 0.1 )(Sc 1.9999 Ce 0.0001 )(Si 2.7 Ge 0.3 )O 12 Phosphor.

Embodiment 2

[0029] A fluorescent powder excited by ultraviolet light or blue light, the chemical formula of the material is: (M 3-x mn x )(R 2-y Ce y )(Si,Ge) 3 o 12 , wherein when M=Ca and Sr in the chemical formula, R=Sc, x=0.1, y=0.1, the preparation molecular formula is (Ca 2.5 Sr 0.4 mn 0.1 )(Sc 1.9 Ce 0.1 )(Si 2.7 Ge 0.3 )O 12 of fluorescent powder.

[0030] Weigh 2.5molCaCO according to molar ratio 3 , 0.4molSrCO 3 , 0.1molMnCO 3 , 0.95molSc 2 o 3 , 0.1mol CeO 2 , 2.7mol SiO 2 , 0.3molGeO 2 , after mixing and grinding evenly, put it in a graphite crucible, put it into a high-temperature tube furnace and bake it in a hydrogen reducing atmosphere, and bake it at 1400 ° C for 4 hours to obtain (Ca 2.5 Sr 0.4 mn 0.1 )(Sc 1.9 Ce 0.1 )(Si 2.7 Ge 0.3 )O 12 Phosphor. figure 1 Be the excitation spectrum (λ em =575nm) schematic diagram; figure 2 Be the emission spectrum (λ ex =450nm) schematic diagram.

Embodiment 3

[0032] A fluorescent powder excited by ultraviolet light or blue light, the chemical formula of the material is: (M 3-x mn x )(R 2-y Ce y )(Si,Ge) 3 o 12 , wherein when M=Ca and Sr in the chemical formula, R=Sc, x=0.1, y=0.5, the preparation molecular formula is (Ca 2.5 Sr 0.4 mn 0.1 )(Sc 1.5 Ce 0.5 )(Si 2.7 Ge 0.3 )O 12 of fluorescent powder.

[0033] Weigh 2.5molCaCO according to molar ratio 3 , 0.4molSrCO 3 , 0.1molMnCO 3 , 0.75molSc 2 o 3 , 0.5molCeO 2 , 2.7mol SiO 2 , 0.3molGeO 2 , after mixing and grinding evenly, put it in a platinum crucible, put it into a high-temperature tube furnace for roasting under the condition of hydrogen reducing atmosphere, and roast it at 1400°C for 4 hours to obtain (Ca 2.5 Sr 0.4 mn 0.1 )(Sc 1.5 Ce 0.5 )(Si 2.7 Ge 0.3 )O 12 Phosphor.

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Abstract

The invention relates to fluorescent powder based on ultraviolet light or blue light excitation, a preparation method thereof and application thereof, and relates to a fluorescent material in the technical field of luminescence. By providing the fluorescent powder, the problem of low luminescent efficiency due to reabsorption among different kinds of fluorescent powder in the process of manufacturing white light-emitting diodes (LED) by a process for mixing the fluorescent powder in the prior art is solved. The fluorescent material has a chemical formula (M3-xMnx)(R2-yCey)(Si,GE)3O12, whereinM is at least one of Mg, Ca, Sr, Ba or Zn; R is at least one of Sc, Y, La, Gd or Lu; and x and y are molar fractions, x is more than or equal to 0.01 and less than or equal to 1, and y is more than or equal to 0.0001 and less than or equal to 0.5. After being ground and mixed uniformly, the fluorescent material is put into a crucible and is put into a high-temperature furnace under the condition of reduction atmosphere to obtain the fluorescent powder. The fluorescent powder can be used as single fluorescent powder to manufacture the white LED, and is high in luminous intensity and chemical stability.

Description

technical field [0001] The invention relates to a fluorescent material in the field of luminescent technology, in particular to a fluorescent powder excited by ultraviolet light or blue light, and a preparation method and application thereof. Background technique [0002] White LED (Light Emitting Diode) has many advantages such as non-toxic, high efficiency and energy saving, long life, all solid state, low working voltage, shock resistance and good safety, and can be widely used in the field of lighting and display. It has far-reaching significance as a new generation of lighting source instead of traditional incandescent and fluorescent lamps. [0003] A common and simple way to realize white LEDs is to coat blue LED chips with phosphors that can be excited by blue light and emit yellow light. At present, the yellow phosphor widely used in commercial white LEDs is mainly YAG yttrium aluminum garnet, whose chemical formula is Y 3 al 5 o 12 : Ce 3+ , (see US Patent 5,9...

Claims

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Application Information

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IPC IPC(8): C09K11/80C09K11/79H01L33/50
CPCY02B20/181Y02B20/00
Inventor 张家骅刘永福张霞郝振东
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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