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Lanthanum boron tungstate red fluorescent powder and preparation method thereof

A red phosphor, boro-tungstic acid technology, applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., to achieve the effects of low sintering temperature, simple equipment, and easy collection

Active Publication Date: 2012-07-18
扬州科丰高新产业投资开发集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Eu 3+ Doped borate and tungstate red phosphors have been extensively studied, but with trivalent europium ion Eu 3+ Activated borotungstate red phosphors have not been reported

Method used

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  • Lanthanum boron tungstate red fluorescent powder and preparation method thereof
  • Lanthanum boron tungstate red fluorescent powder and preparation method thereof
  • Lanthanum boron tungstate red fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] According to the chemical formula LaBWO 6 The stoichiometric ratio of each element in the lanthanum oxide La 2 O 3 :0.5431g, boric acid H 3 BO 3 :0.31g, tungsten oxide WO 3 :0.7883g, after grinding and mixing uniformly in an agate mortar, select air atmosphere for the first calcination, temperature is 350℃, calcination time is 5 hours, then cool to room temperature, take out the sample. After the raw materials calcined for the first time, mix and grind the mixture thoroughly again. In an air atmosphere, calcinate for the second time at 850°C. The calcining time is 8 hours. Cool to room temperature. Take out the sample and calcinate for the second time. After the raw materials, the mixture is fully mixed and ground uniformly again, and the sintering time is 15 hours at 950°C for the third time in an air atmosphere. The sintering time is 15 hours, and the red phosphor is obtained by cooling to room temperature.

[0034] See attached figure 1 , It is the XRD diffraction spect...

Embodiment 2

[0037] According to the chemical formula La 0.95 Eu 0.05 BWO 6 The stoichiometric ratio of each element in the lanthanum oxide La 2 O 3 :0.5159 grams, Europium oxide Eu 2 O 3 :0.0293g, boric acid H 3 BO 3 :0.31g, tungsten oxide WO 3 :0.7883g, after grinding and mixing uniformly in an agate mortar, select air atmosphere for the first calcination, temperature is 400℃, calcination time is 6 hours, then cool to room temperature, take out the sample. After the raw materials calcined for the first time, mix and grind the mixture thoroughly again. In an air atmosphere, the mixture is calcined for the second time at 900°C. The calcining time is 6 hours. After cooling to room temperature, the sample is taken out and calcined for the second time. After the raw materials, the mixture is fully mixed and ground uniformly again, and the sintering time is 12 hours at 1000 ℃ in the air atmosphere, and the sintering time is 12 hours. After cooling to room temperature, the red lanthanum borotungst...

Embodiment 3

[0039] According to the chemical formula La 0.9 Eu 0.1 BWO 6 The stoichiometric ratio of each element in the lanthanum oxide La 2 O 3 :0.489g, Europium oxide Eu 2 O 3 :0.0587g, boric acid H 3 BO 3 :0.31g, tungsten oxide WO 3 :0.7883g, after grinding and mixing uniformly in an agate mortar, select air atmosphere for the first calcination, the temperature is 850℃, the calcination time is 8 hours, then cool to room temperature and take out the sample. After the second calcination of the raw materials, the mixture is again fully mixed and ground uniformly. In an air atmosphere, the sintering time is 13 hours at 950℃, and the sintering time is 13 hours. After cooling to room temperature, the red fluorescence of lanthanum borotungstate is obtained. powder. Its XRD pattern and attached figure 1 approximate.

[0040] See attached image 3 , It is the excitation and emission spectra of the material sample provided in this embodiment; there is strong excitation at 395nm; strong emission a...

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Abstract

The invention relates to lanthanum boron tungstate red fluorescent powder and a preparation method of the lanthanum boron tungstate red fluorescent powder. Active ions of the fluorescent powder are trivalent rare earth europium ions Eu3+, and the molecular formula is La(1-x)EuxBWO6, wherein x is the molar percentage of Eu3+ doping amount, and x is greater than 0.0001 and less than or equal to 0.5; the fluorescent powder can generate very strong exciting light near wavelength of 400nm and 450nm, and the red light emission wavelength is mainly in 616nm and 696nm; and the fluorescent powder conforms to the using requirement of white light LED (light emitting diode). According to the invention, the preparation process of a base material is pollution-free, simple in technology and low in energy consumption, avoids emission of wastewater and waste gas, is environment-friendly and can be finished on common equipment; and the lanthanum boron tungstate red fluorescent powder is easy to collect.

Description

Technical field [0001] The invention relates to a lanthanum borotungstate red phosphor and a preparation method thereof. The provided phosphor is suitable for preparing light emitting, lighting and display devices, and is especially suitable for the red phosphor of white light LED, which belongs to the technical field of inorganic fluorescent materials. Background technique [0002] In recent years, white LEDs have been widely used in displays, camera flashes, panel backlights and indoors due to their high luminous efficiency, low power consumption, long service life, high safety and reliability, flexible control methods, and environmental protection. Lighting, automotive lighting, etc. White LEDs are also known as the fourth generation of lighting sources following the light source incandescent lamp, light source fluorescent lamp, and light source high-intensity gas discharge lamp. Currently, the widely used white light LEDs on the market use blue InGaN die to excite YAG: Ce 3...

Claims

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Application Information

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IPC IPC(8): C09K11/78
CPCY02B20/181Y02B20/00
Inventor 黄彦林朱睿杜福平王佳宇袁蓓玲韦之豪
Owner 扬州科丰高新产业投资开发集团有限公司
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