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Europium-ion-excited fluoromolybdate red fluorescent powder and preparation method and application thereof

A technology of red phosphor and fluoromolybdate, which is applied in the field of molybdate and molybdate red phosphor preparation, to achieve the effects of pure luminous color, reduced production cost and low sintering temperature

Inactive Publication Date: 2012-07-18
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the trivalent europium ion Eu 3+ Activated fluoromolybdate red phosphors have not been reported

Method used

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  • Europium-ion-excited fluoromolybdate red fluorescent powder and preparation method and application thereof
  • Europium-ion-excited fluoromolybdate red fluorescent powder and preparation method and application thereof
  • Europium-ion-excited fluoromolybdate red fluorescent powder and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to the chemical formula NaLa 3.6 Eu 0.4 [Mo 3 o 15 ] The stoichiometric ratio of each element in F, respectively weighing sodium fluoride NaF: 0.21 grams, lanthanum oxide La 2 o 3 : 1.4662 grams, europium oxide Eu 2 o 3 : 0.176 g, molybdenum oxide MoO 3: 1.19 g, ground and mixed in an agate mortar, then calcined for the first time in an air atmosphere at a temperature of 300°C for 7 hours, then cooled to room temperature, and the sample was taken out. After the first calcination of the raw materials, the mixture is fully mixed and ground again, and the second sintering is carried out at 750°C in the air atmosphere. The sintering time is 8 hours, and the fluoromolybdate red fluorescence is obtained after cooling to room temperature. pink.

[0028] See attached figure 1 , which is the XRD diffraction pattern of the material sample prepared according to the technical scheme of this example, and the NaLn 4 Mo 3 o 16 (Ln is a rare earth) structure compa...

Embodiment 2

[0031] According to the chemical formula NaGd 3.2 Eu 0.8 [Mo 3 o 15 ] The stoichiometric ratio of each element in F, respectively weighed sodium fluoride NaF: 0.21 grams, gadolinium oxide Gd 2 o 3 : 1.45 g, europium oxide Eu 2 o 3 : 0.352 g, molybdenum oxide MoO 3 : 1.19g, after grinding and mixing in an agate mortar, choose the air atmosphere for the first calcination, the temperature is 400 ℃, the calcination time is 6 hours, then cool to room temperature, take out the sample. After the first calcination of the raw materials, the mixture is fully mixed and ground again, and the second sintering is carried out at 760°C in the air atmosphere. The sintering time is 5 hours, and the fluoromolybdate red fluorescence is obtained after cooling to room temperature. pink. Its XRD diffraction pattern and attached figure 1 Approximate, excitation and emission spectra with attached figure 2 approximate.

Embodiment 3

[0033] According to the chemical formula NaY 2.8 Eu 1.2 [Mo 3 o 15 ] The stoichiometric ratio of each element in F, respectively weighed sodium fluoride NaF: 0.21 grams, yttrium oxide Y 2 o 3 : 0.7904 g, europium oxide Eu 2 o 3 : 0.528 g, molybdenum oxide MoO 3 : 1.19 g, after grinding and mixing in an agate mortar, select the air atmosphere for the first calcination, the temperature is 500 ° C, the calcination time is 4 hours, then cool to room temperature, and take out the sample. After the first calcination of the raw materials, the mixture is fully mixed and ground evenly, and the second sintering is carried out at 770°C in the air atmosphere. The sintering time is 9 hours, and the fluoromolybdate red fluorescence is obtained after cooling to room temperature. pink. Its XRD diffraction pattern and attached figure 1 Approximate, excitation and emission spectra with attached figure 2 approximate.

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Abstract

The invention relates to europium-ion-excited fluoromolybdate red fluorescent powder, and a preparation method and an application of the fluorescent powder. The molecular formula of the fluorescent powder is NaR(4-4x)Eu4x[Mo3O15]F, wherein R is at least one of rare earth ions La3+, Sm3+, Gd3+, Dy3+, Lu3+ and Y3+; x is the molar percentage of Eu3+ doping amount; x is greater than x and is less than or equal to 0.6; the light emitting wavelength is mainly in 615nm, fluorescent powder generates very strong excitation near wavelength of 400nm and 450nm, and the emitting wavelength coincides with the emission wavelength of a near ultraviolet and blue light LED (light emitting diode) chip; and the luminous efficiency is high. According to the invention, the preparation method is simple and has good reproducibility; the obtained fluorescent powder has stable quality, and is easy to operate and can be produced industrially; the technology can be finished on common equipment, is easy, avoids emission of wastewater and waste gas, and is environment-friendly; and the fluorescent powder is easy to collect. The sintering temperature is low, the good crystallization of matrix can be realized at 750 DEG C, so that the energy is saved.

Description

technical field [0001] The present invention relates to a molybdate, in particular to a europium ion Eu 3+ The activated molybdate red fluorescent powder, its preparation method and application belong to the technical field of inorganic luminescent materials. Background technique [0002] In 1996, through the use of GaN-LED chips and YAG:Ce 3+ The combination of phosphor powder emits white light, and the first white LED solid light source is developed. White light LED has attracted great attention due to its advantages of small size, low heat generation, low power consumption, long life, fast response, environmental protection, and planar packaging. It is widely used in displays, camera flashes, and panel backlights. source and indoor lighting, automotive lighting and so on. White light LED is also known as the fourth-generation lighting source after incandescent lamps, fluorescent lamps, and high-intensity gas discharge lamps. At present, the realization of white light ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/86H01L33/50
CPCY02B20/181Y02B20/00
Inventor 黄彦林朱睿杜福平王佳宇袁蓓玲韦之豪
Owner SUZHOU UNIV