Vanadate red phosphor, preparation method and application

A technology of red phosphor and vanadate, which is applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of low absorption efficiency, failure to meet the basic requirements of red phosphor, and no invention disclosure or report of red phosphor and other issues to achieve the effect of easy product

Active Publication Date: 2012-04-04
扬州科丰高新产业投资开发集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Trivalent europium ion Eu 3+ Activated vanadate red phosphor such as YVO 4 :Eu 3+ Although it has good light absorption in the ultraviolet region and can achieve effective red light emission, the absorption efficiency in the near ultraviolet region is very low, it is difficult to match with near ultraviolet and blue LED chips, and it cannot meet the basic requirements of red phosphor powder for white LED lighting. Require
[0008] But the red fluorescent powder of the alkali metal alkaline earth metal rare earth vanadate activated with trivalent europium ion has no invention disclosure and report

Method used

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  • Vanadate red phosphor, preparation method and application
  • Vanadate red phosphor, preparation method and application
  • Vanadate red phosphor, preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0033] This embodiment prepares sample NaCaLa 1-x Eu x (VO 4 ) 2 , where x is 0.02, 0.1, 0.15, 0.2, 0.3 and 0.45, respectively, and the component formulations of samples 1-6 are shown in Table 1.

[0034] Table 1:

[0035] sample 1 sample 2 sample 3 Sample 4 Sample 5 Sample 6 Na 2 CO 3 (gram) 0.265 0.265 0.265 0.265 0.265 0.265 CaCO 3 (gram) 0.501 0.501 0.501 0.501 0.501 0.501 La 2 o 3 (gram) 0.7983 0.7331 0.6924 0.6516 0.5702 0.448 Eu 2 o 3 (gram) 0.0176 0.088 0.132 0.176 0.264 0.396 NH 4 VO 3 (gram) 1.1698 1.1698 1.1698 1.1698 1.1698 1.1698

[0036] Prepare samples 1-6 according to the formula dosage in Table 1: Weigh sodium carbonate Na 2 CO 3 , calcium carbonate CaCO 3 , lanthanum oxide La 2 o 3 , europium oxide Eu 2 o 3 and ammonium vanadate NH 4 VO 3 , after grinding and mixing uniformly in an agate mortar, choose the air atmosphere for the first calcination, the t...

Embodiment 2

[0046] NaCaLa 0.65 Y 0.2 Eu 0.15 (VO 4 ) 2 Preparation of:

[0047] Weigh sodium carbonate Na 2 CO 3 : 0.265 g, calcium carbonate CaCO 3 : 0.5005 g, lanthanum oxide La 2 o 3 : 0.5295 g, yttrium oxide Y 2 o 3 : 0.113 g, europium oxide Eu 2 o 3 : 0.132 g and ammonium vanadate NH 4 VO 3 : 1.1698 grams, ground in an agate mortar and mixed evenly, select air atmosphere for the first calcination, temperature is 250 ℃, calcination time 7 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 850°C in the air atmosphere. The sintering time is 10 hours, and the powder is obtained after cooling to room temperature. The red phosphor powder of ionic europium, the excitation and emission spectra are respectively with figure 1 and figure 2 resemblance.

Embodiment 3

[0049] NaCaLa 0.5 Gd 0.3 Eu 0.2 (VO 4 ) 2 Preparation of:

[0050] Weigh sodium carbonate Na 2 CO 3 : 0.265 g, calcium carbonate CaCO 3 : 0.5005 g, lanthanum oxide La 2 o 3 : 0.4073 g, gadolinium oxide Gd 2 o 3 : 0.2719 g, europium oxide Eu 2 o 3 : 0.176 g and ammonium vanadate NH 4 VO 3 : 1.1698 grams, after grinding and mixing uniformly in an agate mortar, select the air atmosphere for the first calcination, the temperature is 350 ℃, the calcination time is 5 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 850°C in the air atmosphere. The sintering time is 6 hours, and the powder is obtained after cooling to room temperature. Ionic europium red phosphor. Excitation and emission spectra as respectively and figure 1 and 2 approximate.

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Abstract

The invention discloses vanadate red phosphor, a preparation method and application. The molecular formula of Eu3<+>activated vanadate red phosphor is as follows: NaM<II>La1-x-y (VO4) 2: Eux, R<III>y, wherein M<II> is one or more than one of Mg<2+>, Ca<2+>, Sr<2+>, Ba<2+> and Zn<2+>, R<III> is at least one of Sm<3+>, Gd<3+>, Tb<3+>, Dy<3+>, Lu<3+> and Y<3+>, x is Eu<3+> doped mole percentage coefficient, which is greater than or equal to 0.0001 or less than and equal to 0.6, and y is R<III> replaced La<3+> mole percentage coefficient, which is greater than or equal to 0.0001 and less than or equal to 0.6. In the invention, the emission wavelength of the vanadate red phosphor is mainly 619nm, very strong excitation can be produced when the emission wavelength is about 400nm-450nm, the emission wavelength is fit with the emission wavelength of an LED (Light-emitting Diode) chip with near ultravoilet light and blue light, and the light-emitting efficiency is high. The invention has a simple manufacturing method and good repeatability. The obtained product has stable quality, and is easy for operation and industrial production.

Description

technical field [0001] The invention belongs to the technical field of inorganic luminescent materials, and relates to a vanadate, in particular to a europium ion Eu 3+ Activated vanadate red phosphor, preparation method and application. Background technique [0002] The vanadate matrix can well accommodate doped rare earth ions, and the VO in its lattice 4 The group has good absorption in the ultraviolet region. As a material activated by rare earth ions, it can transfer the energy absorbed by the matrix to rare earth ions through effective energy transfer, and obtain the luminescence of rare earth ions. Take YVO 4 :Eu 3+ The representative trivalent europium ion-activated vanadate red luminescent powder is an excellent fluorescent material, widely used in high-pressure mercury lamps, plasma flat panel display PDP, cathode ray tube CRT and medical scintillation materials. With the development of modern technology, there are more and more application fields of phosphors....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/82H01L33/50
Inventor 黄彦林王佳宇朱睿杜福平袁蓓玲韦之豪
Owner 扬州科丰高新产业投资开发集团有限公司
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