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Niobate red fluorescent powder as well as preparation method and application thereof

A red phosphor and niobate technology, applied in the field of fluorescent materials, can solve the problems of short life, unstable performance, low luminous efficiency of white LEDs, etc., and achieve the effects of no waste water and exhaust emissions, simple equipment, and environmental friendliness.

Active Publication Date: 2013-09-04
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

The first method has been commercialized, but the products produced by this method will have their own defects: the color rendering is not good due to the lack of red light. The solution is to add red phosphor to it to obtain a high color rendering index.
In the existing technology, the phosphor used for white LED lacks red light components, or the luminous efficiency of red phosphor is not high, or the performance is unstable, resulting in low luminous efficiency or short life of the packaged white LED

Method used

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  • Niobate red fluorescent powder as well as preparation method and application thereof
  • Niobate red fluorescent powder as well as preparation method and application thereof
  • Niobate red fluorescent powder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of Mg 2 La 2.85 Eu 0.15 NbO 9 :

[0029] Weigh basic magnesium carbonate pentahydrate C 4 Mg 4 o 12 -H 2 MgO 2 -5H 2 O: 2.4283 g, lanthanum oxide La 2 o 3 : 2.3215 g, niobium pentoxide Nb 2 o 5 : 0.6645 g, europium oxide Eu 2 o 3: 0.132 grams, sintering aid boric acid: 0.3 grams, after grinding and mixing in an agate mortar, select the air atmosphere for the first calcination, the temperature is 300 ° C, the calcination time is 2 hours, then cool to room temperature, and take out the sample. After the raw materials calcined for the first time, the mixture is fully mixed and ground again, and then sintered for the second time at 1250°C in an air atmosphere, the sintering time is 8 hours, and cooled to room temperature; after the raw materials calcined for the second time , add boric acid as a sintering aid, mix and grind the mixture thoroughly again, and sinter for the third time in an air atmosphere at 1450°C, the sintering time is 5 hours, an...

Embodiment 2

[0035] Preparation of Mg 2 La 2.79 Eu 0.21 NbO 9

[0036] Weigh basic magnesium carbonate pentahydrate C 4 Mg 4 o 12 -H 2 MgO 2 -5H 2 O: 2.4283 g, lanthanum oxide La 2 o 3 : 2.2726 g, niobium pentoxide Nb 2 o 5 : 0.6645 g, europium oxide Eu 2 o 3 : 0.1848 grams, sintering aid lithium carbonate: 0.27 grams, after grinding and mixing uniformly in an agate mortar, select the air atmosphere for the first calcination, the temperature is 1000 ° C, the calcination time is 4 hours, then cool to room temperature, and take out the sample. After the raw materials calcined for the first time, add 0.166 grams of boric acid, add lithium carbonate as a sintering aid, mix and grind the mixture thoroughly again, and sinter for the second time in an air atmosphere at 1400 ° C. The sintering time is 8 hours. After cooling down to room temperature, a powdery red fluorescent powder doped with rare earth ion europium is obtained. Excitation and emission spectra as respectively and ...

Embodiment 3

[0038] Preparation of Mg 2 La 2.7 Eu 0.3 NbO 9

[0039] Weigh magnesium hydroxide Mg(HO) 2 : 0.5832 g, lanthanum oxide La 2 o 3 : 2.1993 g, niobium pentoxide Nb 2 o 5 : 0.6645 g, europium oxide Eu 2 o 3 : 0.264 grams, sintering aid Lithium oxide: 0.3 grams, after grinding and mixing in an agate mortar, select the air atmosphere for the first calcination, the temperature is 600 ° C, the calcination time is 5 hours, then cool to room temperature, and take out the sample. After the raw materials calcined for the first time, add lithium oxide as a sintering aid, mix and grind the mixture thoroughly again, and sinter for the second time in an air atmosphere at 1350°C, the sintering time is 12 hours, and cool to room temperature, that is A red fluorescent powder doped with rare earth ion europium is obtained in powder form. Excitation and emission spectra as respectively and figure 2 with 3 approximate.

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Abstract

The invention discloses niobate red fluorescent powder as well as a preparation method and application thereof. A molecular formula of the niobate red fluorescent powder is Mg2La3-3x-3yR<III>3yNbO9: Eu3x, wherein R<III> is at least one of Sm<3+>, Gd<3+>, Tb<3+>, Dy<3+>, Lu<3+> and Y<3+>, x is the molar percentage coefficient for doping Eu<3+> for substituting La<3+>, x is not less than 0.00001 and not more than 0.6, y is the molar percentage coefficient for substituting the La<3+> with R<III>, and y is not less than 0.00001 and not more than 0.6. The preparation method comprises the following steps of: weighing raw materials according to the proportion, performing fine grinding, uniformly mixing, then pre-burning and sintering at the temperature of 300-1000 DEG C, cooling, further adding sintering aids, grinding, uniformly mixing and further calcining in an air atmosphere, wherein the calcination temperature is 1100-1500 DEG C and the calcination time is 1-15 hours. The red fluorescent powder can emit bright red fluorescence under excitation of near ultraviolet light, and the emission wavelength is mainly 615nm.

Description

technical field [0001] The invention relates to a niobate fluorescent powder activated by europium ions Eu3+, belonging to the technical field of fluorescent materials. Background technique [0002] With the technical breakthrough of high-brightness GaN blue diode LED, in 1996, a blue LED chip and phosphor ((Y, Gd) appeared. 3 Al 5 o 12 : Ce 3+ ) combination of white light-emitting diode lighting (white LED). In recent years, white LED lighting has developed rapidly. It is considered to be another technological breakthrough after incandescent lamps and fluorescent lamps in the history of human lighting. One of the techniques. [0003] There are generally three ways to use phosphors to produce white light: the first is to combine blue LED chips with yellow phosphors; the second is to combine blue LED chips with red and green phosphors; , Green tricolor phosphors produce white light. The first method has been commercialized, but the products produced by this method will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78H01L33/50
CPCY02B20/181Y02B20/00
Inventor 黄彦林杜福平王佳宇朱睿张素银韦之豪袁蓓玲
Owner 扬州科丰高新产业投资开发集团有限公司
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