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Terbium-doping green fluorescent powder using vanadate as substrate and preparation method thereof

A technology of green fluorescent powder and vanadate, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as low luminous efficiency and affecting luminous flux, and achieve high luminous intensity, good color rendering, and good reproducibility Effect

Inactive Publication Date: 2017-09-08
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As an ultraviolet-near-ultraviolet LED chip excites red, green, and blue phosphors, because the luminous efficiency of green phosphors is relatively low compared with the other two colors of phosphors, it will affect the luminous flux of the entire LED

Method used

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  • Terbium-doping green fluorescent powder using vanadate as substrate and preparation method thereof
  • Terbium-doping green fluorescent powder using vanadate as substrate and preparation method thereof
  • Terbium-doping green fluorescent powder using vanadate as substrate and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take x=0.01, according to the chemical formula KBa 0.99 VO 4 : The stoichiometric ratio of 0.01Tb, weigh K respectively with electronic balance 2 CO 3 、BaCO 3 , V 2 o 5 and Tb 4 o 7 , wherein the purity of the rare earth oxide is 99.99%, and the rest are analytically pure; mix all the above-mentioned raw materials and grind them for 20 minutes to mix the raw materials evenly to obtain a mixture; put the obtained mixture into a corundum crucible , and put the corundum crucible in a rapid heating resistance furnace, and calcined it in an air atmosphere. During this period, the temperature was raised to 1000 ° C at a rate of 3 ° C / min, and the calcination time was 3 h. After the calcination was completed, it was cooled with the furnace until it was cooled to At room temperature, a calcined product was obtained; the calcined product was taken out and ground again for 20 minutes to obtain a vanadate-based terbium-doped green phosphor.

Embodiment 2

[0033] Take x=0.01, according to the chemical formula KBa 0.99 VO 4 : The stoichiometric ratio of 0.01Tb, weigh K respectively with electronic balance 2 CO 3 、BaCO 3 , V 2 o 5 and Tb 4 o 7 , wherein the purity of the rare earth oxide is 99.99%, and the rest are analytically pure; grind all the raw materials weighed above for 30 minutes, mix the raw materials uniformly, and obtain a mixture; put the obtained mixture into a corundum crucible, and The corundum crucible is placed in a rapid heating resistance furnace, calcined in an air atmosphere, raised to 1050°C at a heating rate of 5°C / min, and calcined for 5 hours. After the calcination is completed, it is cooled with the furnace until it cools to room temperature, and the calcined product is obtained. Product; take out the calcined product and grind it again for 30 minutes to obtain a terbium-doped green fluorescent powder based on vanadate.

Embodiment 3

[0035] Take x=0.01, according to the chemical formula KBa 0.99 VO 4 : The stoichiometric ratio of 0.01Tb, weigh K respectively with electronic balance 2 CO 3 、BaCO 3 , V 2 o 5 and Tb 4 o 7 , wherein the purity of the rare earth oxide is 99.99%, and the rest are analytically pure; all the raw materials weighed above are ground for 60 minutes to mix the raw materials evenly to obtain a mixture; put the obtained mixture into a corundum crucible, and The corundum crucible was placed in a rapid heating resistance furnace, calcined in an air atmosphere, raised to 1200°C at a heating rate of 10°C / min, and calcined for 9 hours. After the calcination was completed, it was cooled with the furnace until it cooled to room temperature, and obtained Calcined product; take out the calcined product and grind it again for 60 minutes to obtain a terbium-doped green fluorescent powder based on vanadate.

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Abstract

The invention discloses terbium-doping green fluorescent powder using vanadate as a substrate. The terbium-doping green fluorescent powder uses the vanadate as the substrate. A chemical general formula is KBa<1-x>VO4:xTb, wherein the x is greater than or equal to 0.01 but smaller than or equal to 0.08. Through the doping of active ions Tb<3+>, the terbium-doping green fluorescent powder using the vanadate as the substrate is obtained through the preparation; fluorescent powder is suitable for near ultraviolet or blue light excitation; the main excitation peak of the green fluorescent powder is 312nm; the emission spectrum is 400nm to 620 nm; the main peak is near 488 nm and 545 nm; the chemical property is stable; the illumination performance is good. The invention also discloses a preparation method of the terbium-doping green fluorescent powder. K2CO3, BaCO3, V2O5 and Tb4O7 are mixed and ground; calcination is performed in the air atmosphere; heat insulation is performed; after the cooling along with a furnace, grinding is performed; finally, the terbium-doping green fluorescent powder using the vanadate as the substrate is finally obtained; the preparation is performed on the basis of a solid-phase synthesis method; the temperature rise process is simple; the method is simple; the implementation is easy; the repeatability is high; the preparation period is short.

Description

technical field [0001] The invention belongs to the technical field of phosphor preparation for LEDs, and in particular relates to a terbium-doped green phosphor with vanadate as a matrix, and also relates to a preparation method of the terbium-doped green phosphor. Background technique [0002] Light Emitting Diode (LED) is recognized as a new light source in the 21st century. It has many advantages such as energy saving, fast response, green environmental protection, long life, small size and high luminous efficiency. It has great potential in the field of lighting and display. Application prospects. In recent years, white LEDs, as a new generation of energy-saving light sources, have attracted widespread attention. At present, there is a shortage of white light phosphors that match the near-ultraviolet light tube cores, and it is generally produced by mixing red, green, and blue three primary color phosphors, and the luminous performance is not ideal. Therefore, it is o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/82
CPCC09K11/7751
Inventor 武秀兰白文妮任强海鸥林飞焦叶辉李欢欢
Owner SHAANXI UNIV OF SCI & TECH