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Ultraviolet /near ultraviolet light excited green emitting phosphor and preparation method thereof

A technology of green phosphor and near-ultraviolet light, which is applied in chemical instruments and methods, luminescent materials, rare earth metal compounds, etc., can solve the problems of low luminous efficiency of phosphor, complex process, narrow excitation wavelength, etc., and achieves the preparation method The effect of simplicity, abundant sources and low production cost

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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing phosphors have low luminous efficiency and narrow excitation wavelength
Chinese invention patent CN101497789A discloses a kind of nitride green fluorescent powder and its preparation method, the SrCO 3 、BaCO 3 or a combination of both and Si(NH) 2 and Eu 2 o 3 Perform ball milling and mixing for 2-3 hours to obtain a mixture, then sinter the mixture at a temperature of 1400-1500° C. for 3-4 hours and then pulverize it. The pulverized product is washed 2-3 times with deionized water and isopropanol respectively. Then dry at a temperature of 90-100°C for 16-24 hours to obtain the dried product, and finally sieve the dried product to obtain a nitride green phosphor. The process is relatively complicated, not easy to operate, and the synthesis cost is high.

Method used

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  • Ultraviolet /near ultraviolet light excited green emitting phosphor and preparation method thereof
  • Ultraviolet /near ultraviolet light excited green emitting phosphor and preparation method thereof
  • Ultraviolet /near ultraviolet light excited green emitting phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of Ba 9.999 Eu 0.001 Al 2 o 13 : According to the chemical formula Ba 9.999 Eu 0.001 Al 2 o 13 The stoichiometric ratio of each element in is weighed respectively Raw materials: europium oxide Eu 2 o 3 : 0.001g, barium carbonate BaCO 3 : 9.849g, aluminum oxide Al 2 o 3 : 0.517g, ground and mixed evenly in an agate mortar, pre-calcined in air atmosphere, the pre-calcined temperature is 600°C, the pre-calcined time is 10h, then cooled to room temperature with the furnace, and the sample is taken out; the first pre-calcined The raw materials were thoroughly mixed and ground in the same way again, and the second pre-calcination was carried out in the air atmosphere. The pre-calcination temperature was 1000°C, the pre-calcination time was 1h, and then cooled to room temperature, and the sample was taken out; Grinding and mixing evenly, calcining in a reducing atmosphere, the calcining temperature is 1300°C, the calcining time is 1h, and then cooled to ...

Embodiment 2

[0042] Preparation of Ba 9.5 Eu 0.5 Al 2 o 13 : According to the chemical formula Ba 9.5 Eu 0.5 Al 2 o 13 The stoichiometric ratio of each element in is weighed respectively Raw material: europium nitrate Eu(NO 3 ) 3 ·6H 2 O: 0.44 grams, barium oxide BaO: 8.03 grams, aluminum nitrate Al (NO 3 ) 3 9H 2 O: 3.75 grams, mixed evenly in an agate mortar, pre-calcined in an air atmosphere, the pre-calcined temperature is 1000 ° C, the pre-calcined time is 8h, and then cooled to room temperature with the furnace, the sample is taken out, and the pre-calcined raw material is again Thoroughly grind and mix uniformly, calcined in reducing atmosphere, calcined temperature is 1100°C, calcined for 12 hours, and then cooled to room temperature to obtain powdery green fluorescent powder.

[0043] The X-ray powder diffraction pattern, excitation spectrum, luminescence spectrum, luminescence decay curve, and SEM image of the sample prepared in this example are consistent with those ...

Embodiment 3

[0045] Preparation of Ba 9 EuAl 2 o 13 : According to the chemical formula Ba 9 EuAl 2 o 13 The stoichiometric ratio of each element in is weighed respectively Raw materials: europium oxide Eu 2 o 3 : 1.76 grams, barium oxide BaO: 11.74 grams, aluminum nitrate Al(NO 3 ) 3 9H 2 O: 3.75 grams, mixed and ground in an agate mortar evenly, then pre-calcined in an air atmosphere, the pre-calcined temperature is 750°C, the pre-calcined time is 6h, and then cooled to room temperature with the furnace, the sample is taken out, and the pre-calcined raw material Mix well and grind evenly by the same method again, calcining in a reducing atmosphere at a calcining temperature of 1200°C for a calcining time of 4 hours, and then cool to room temperature to obtain a powdery green fluorescent powder.

[0046] The X-ray powder diffraction pattern, excitation spectrum, luminescence spectrum, luminescence decay curve, and SEM image of the sample prepared by the technical scheme of this e...

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Abstract

The invention discloses ultraviolet / near ultraviolet light excited green emitting phosphor and a preparation method thereof. The green emitting phosphor has a chemical formula of Ba10-10xEu10xAl2O13, wherein the excited ion is a europium ion Eu<2+>, x is a molar ratio at an Eu<2+> doped Ba<2+> site, and x is more than or equal to 0.0001 and less than or equal to 0.25. The green emitting phosphor prepared by the invention has the advantages of wide excitation wavelength, particle dispersion uniformity, excellent heat stability and physical and chemical stability, avoidance from acting with packaging materials, semiconductor chips and the like and the like, is easily and efficiently excited by light in the ultraviolet / near ultraviolet band (300-420nm) and is high in luminous intensity, high in luminous efficiency and pure in fluorescent color; during preparation, compounds containing elements needed for synthesis of luminous materials are mixed according to a ratio, the green emitting phosphor is prepared by a high temperature solid state method or a chemical synthesis method, repeated calcination preparations are needed, and the preparation method is simple in process, easy to operate, rich in raw material source and low in production cost.

Description

technical field [0001] The invention relates to a fluorescent material and a preparation method thereof, in particular to a green fluorescent powder excited by ultraviolet / near ultraviolet light and a preparation method thereof, belonging to the technical field of luminescent materials. Background technique [0002] White light-emitting diode (LED) is an energy conversion device that can directly convert electrical energy into visible light energy. It is a new type of lighting display device and a green and environmentally friendly lighting source. White light-emitting diode lighting equipment has the advantages of low working voltage, power saving, stable performance, small size, energy saving and environmental protection, no heat radiation, long life, strong anti-vibration and impact resistance, etc., and is widely used in indicator lights, backlights, cameras, etc. , decoration, mobile phone, indoor commercial atmosphere lighting and city night scene, stage lighting, exhi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80C01F17/00
CPCC01F17/34C01P2002/72C01P2004/03C01P2006/60C09K11/7734
Inventor 乔学斌
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