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Aluminate red phosphor, preparation method and application

A red phosphor and aluminate technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of poor stability and weak absorption of white LED phosphors, and achieve easy products, no waste water and waste gas. Emissions, high efficiency

Inactive Publication Date: 2012-06-13
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of weak absorption and poor stability of current white LED phosphors in the near ultraviolet and blue regions, and to provide a red phosphor with high crystallinity, good luminous quality, simple preparation process and no pollution. Phosphor powder and its preparation method

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Sr 3 Y 0.93 Eu 0.07 al 2 o 7.5 preparation of

[0032] Weigh strontium carbonate SrCO 3 : 1.4763 g, alumina Al 2 o 3 : 0.34 g, yttrium oxide Y 2 o 3 : 0.35 g, europium oxide Eu 2 o 3 : 0.0411 g, after grinding and mixing uniformly in an agate mortar, select the air atmosphere for the first calcination, the temperature is 850 ℃, the calcination time is 1.5 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 1400°C in the air atmosphere. The sintering time is 10 hours, and cooled to room temperature to obtain powder doped rare earth. Ionic europium red phosphor.

[0033] See attached figure 1 , which is a comparison of the X-ray powder diffraction pattern of the material sample prepared according to the technical scheme of this embodiment and the standard card PDF#47-0777, and the XRD test results show that the...

Embodiment 2

[0037] Sr 3 Y 0.5 Eu 0.5 al 2 o 7.5 preparation of

[0038] Weigh strontium carbonate SrCO 3 : 1.4763 g, aluminum oxide Al 2 o 3 : 0.34 g, yttrium oxide Y 2 o 3 : 0.188 g, europium oxide Eu 2 o 3 : 0.293 g, ground in an agate mortar and mixed evenly, choose the air atmosphere for the first calcination, the temperature is 850 ° C, the calcination time is 4.5 hours, then cool to room temperature, take out the sample and add boric acid H 3 BO 3 : 0.115g, mix and grind the mixture well again, and sinter for the second time in the air atmosphere at 1200°C, the sintering time is 6 hours, cool to room temperature, and obtain powdery Eu 3+ Doped red phosphor. XRD test results show that the prepared material is a single-phase material. Excitation and emission spectra as respectively and figure 2 and 3 approximate. In this example, Eu 3+ The doping concentration reaches 50mol% without quenching of luminescence.

Embodiment 3

[0040] Sr 3 Lu 0.93 Eu 0.07 al 2 o 7.5 preparation of

[0041] Weigh strontium carbonate SrCO 3 : 1.1073 g, aluminum hydroxide Al(OH) 3 : 0.39 g, lutetium oxide Lu 2 o 3 : 0.4627 g, europium oxide Eu 2 o 3 : 0.0308 g, after grinding and mixing uniformly in an agate mortar, select the air atmosphere for the first calcination, the calcination temperature is 950 ℃, the calcination time is 2.5 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 again, and the second sintering is carried out at 1400°C in the air atmosphere. The sintering time is 7 hours, and the powdery Eu is obtained after cooling to room temperature. 3+ Doped red phosphor. excitation spectrum and figure 2 approximate. See attached Figure 4 , is the luminescence spectrum obtained under near-ultraviolet 395nm excitation of the material sample prepared according to the technical scheme of this embodime...

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Abstract

The invention discloses an aluminate red phosphor, a preparation method and application. Activation ions of the aluminate red phosphor are trivalent europium ions Eu<3+>; the chemical formula of the aluminate red phosphor is M<II>3RE<III>1-xEuxAl2O7.5, wherein, M<II> is one or more selected from the group consisting of Mg<2+>, Ca<2+>, Sr<2+> and Ba<2+>, RE<III> is at least one selected from the group consisting of La<3+>, Ce<3+>, Pr<3+>, Nd<3+>, Sm<3+>, Gd<3+>, Tb<3+>, Dy<3+>, Ho<3+>, Er<3+>, Tm<3+>, Yb<3+>, Lu<3+>, Sc<3+> and Y<3+>, and x is mole percentage of doped Eu<3+> and is no less than 0.0001 and no more than 1.0. The aluminate red phosphor has strong excitation at a wavelength of about 400 nm, high luminous efficiency and good thermal stability and emits red fluorescence which mainly has a wavelength of 613 nm under the excitation of near ultraviolet light. The preparation method provided in the invention is simple, has good reproducibility, enables a product to have stable quality and is easy to operate and easily applicable in industrial production.

Description

technical field [0001] The invention relates to an aluminate red fluorescent powder and a preparation method thereof, which is suitable for light emission, illumination and display, especially red fluorescent powder suitable for white LEDs, and belongs to the technical field of inorganic fluorescent materials. Background technique [0002] In the 1990s, with the technological breakthrough of high-brightness GaN blue diode LEDs, in 1996, blue LED chips and phosphors ((Y, Gd) appeared. 3 al 5 o 12 : Ce 3+ ) combined white light LED is considered to be another technological breakthrough after incandescent lamps and fluorescent lamps in the history of human lighting, and is one of the most promising high-tech technologies in the 21st century. [0003] There are three methods of using phosphors to produce white light: blue LED chips with yellow phosphors; blue LEDs with red and green phosphors; UV-LED chips with red, blue and green phosphors. The current commercialization is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80H01L33/50
Inventor 黄彦林王佳宇朱睿杜福平张素银韦之豪袁蓓玲
Owner SUZHOU UNIV
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