Pr, Eu/Tb co-doped tungstate/molybdate fluorescent powder and preparation method thereof

A technology of molybdate and phosphor, which is applied in the field of rare earth luminescent materials, can solve the problems of high cost of preparation methods, narrow fluorescent pink domain, low light effect of phosphor, etc., and achieve improved luminous performance, stable physical and chemical properties, and high luminous efficiency Effect

Inactive Publication Date: 2013-01-30
ZHOUKOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 102676165A reports a fluorescent powder for alkaline earth borate white light LED and its preparation method, which solves the technical problems of low light effect, poor stability, environmental pollution and low service life of traditional fluorescent powder
CN 102277166A clarifies aluminum magnesium phosphate phosphors co-doped with europium ions and manganese ions and its preparation method, which overcomes the disadvantages of narrow traditional fluorescent pink domain, the need for compounding of various phosphors, and high cost and complicated preparation methods
However, there is still a lack of phosphors with excellent performance, good thermal and chemical stability, wide color gamut, and can be excited by ultraviolet and blue light on the market.

Method used

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  • Pr, Eu/Tb co-doped tungstate/molybdate fluorescent powder and preparation method thereof
  • Pr, Eu/Tb co-doped tungstate/molybdate fluorescent powder and preparation method thereof
  • Pr, Eu/Tb co-doped tungstate/molybdate fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation chemical formula is: A 0.92 BO 4 : 0.02Pr, 0.06Eu (that is, when the element A in the chemical formula is Sr, the element B is W, x=0.02, y=0.06) phosphor.

[0025] According to the chemical formula Sr 0.92 WO 4 :0.02Pr, 0.06Eu Weigh strontium carbonate SrCO 3 (A.R.) (A.R. means analytically pure), ammonium tungstate (NH 4 ) 10 W 12 O 41 (A.R.), praseodymium oxide Pr 6 O 11 (Purity 99.99%) and europium oxide Eu 2 O 3 (Purity 99.99%); mix them with a small amount of absolute ethanol in a mortar and grind for 1 hour to make them thoroughly mixed; dry the above mixture, put it into a corundum crucible, compact, and place it in a high-temperature box furnace. The temperature is raised to 900°C at a rate of 300°C / hour, kept for 5 hours, cooled to room temperature, then taken out, crushed, and ground to obtain the phosphor of the present invention.

Embodiment 2

[0027] The preparation chemical formula is: A 0.92 BO 4 : 0.03Pr, 0.05Eu (that is, when the A element is Sr, the B element is W, x=0.03, and y=0.05 in the chemical formula) phosphor.

[0028] According to the chemical formula Sr 0.92 WO 4 : 0.03Pr, 0.05Eu Weigh strontium carbonate SrCO 3 (A.R.) (A.R. means analytically pure), ammonium tungstate: (NH 4 ) 10 W 12 O 41 (A.R.), praseodymium oxide Pr 6 O 11 (Purity 99.99%) and europium oxide Eu 2 O 3 (Purity 99.99%); mix them with a small amount of absolute ethanol in a mortar and grind for 1 hour to make them thoroughly mixed; dry the above mixture, put it into a corundum crucible, compact, and place it in a high-temperature box furnace. The temperature is raised to 900°C at a rate of 300°C / hour, kept for 5 hours, cooled to room temperature, then taken out, crushed, and ground to obtain the phosphor of the present invention.

Embodiment 3

[0030] The preparation chemical formula is: A 0.92 BO 4 : 0.04Pr, 0.04Eu (that is, when the element A in the chemical formula is Sr, the element B is W, x=0.04, y=0.04) phosphor.

[0031] According to the chemical formula Sr 0.92 WO 4 : 0.04Pr, 0.04Eu Weigh strontium carbonate SrCO 3 (A.R.) (A.R. means analytically pure), ammonium tungstate (NH 4 ) 10 W 12 O 41 (A.R.), praseodymium oxide Pr 6 O 11 (Purity 99.99%) and europium oxide Eu 2 O 3 (Purity 99.99%); mix them with a small amount of absolute ethanol in a mortar and grind for 1 hour to make them thoroughly mixed; dry the above mixture, put it into a corundum crucible, compact, and place it in a high-temperature box furnace. The temperature is raised to 900°C at a rate of 300°C / hour, kept for 5 hours, cooled to room temperature, then taken out, crushed, and ground to obtain the phosphor of the present invention.

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Abstract

The invention discloses a Pr, Eu/Tb co-doped tungstate/molybdate fluorescent powder. The chemical composition of the fluorescent powder is Al-x-yBO4:xPr, yTb/Eu, wherein an A element is one or more selected from Ca, Ba and Sr; a B element is W or Mo; x is more than 0.01 but less than or equal to 0.10; and y is more than 0.01 but less than or equal to 0.10. A preparation method thereof comprises the following steps: mixing the carbonate or oxide of the A element and the ammonium salt of tungstic acid/molybdic acid with the oxide of the Pr, Tb or Eu in the proportion of mole ratio of A:BO4:Pr:Tb/Eu being (1-x-y):1:x:y; mixing with less absolute ethyl alcohol; fully grinding and uniformly mixing, thereby obtaining a mixture; and sintering at high temperature, crushing, grinding and drying, thereby obtaining the fluorescent powder. Under the excitation of ultraviolet light (especially being 210nm-250nm), the sample of the fluorescent powder respectively emits 485nm blue light, 585nm yellow light, 545nm green light, and 612nm and 645nm red light; the green light, yellow light and white light can be respectively obtained by adjusting the variety and concentration of the doped rare earth Pr, Eu and Tb ions; and the preparation method is suitable for the preparation of the high-light white light LED fluorescent powder.

Description

Technical field [0001] The invention belongs to the technical field of rare earth luminescent materials. Specifically, the invention relates to a Pr, Eu / Tb co-doped tungsten / molybdate phosphor and a preparation method thereof. Background technique [0002] White light-emitting diodes have the advantages of high luminous efficiency, energy saving, stability, and environmental protection. They overcome the shortcomings of traditional incandescent lamps and fluorescent lamps, such as high power consumption, fragility, and mercury pollution from discarded materials. They were once called "green lighting sources". "The application prospect is very broad. According to the principle of photometry, white light can be obtained by three schemes. (1) It is composed of a mixture of blue, green and red light; (2) is a mixture of blue and yellow light; (3) is a combination of multi-primary light. Red, green, and blue LEDs emit light. Because the light output of the device is greatly affected...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/68H01L33/50
CPCY02B20/181Y02B20/00
Inventor 武文宣亚文王振岭李春阳尹江龙
Owner ZHOUKOU NORMAL UNIV
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