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Molybdate red phosphor powder applicable to white-light LED (Light-Emitting Diode) and preparation method thereof

A technology of red fluorescent powder and molybdate, which is applied in chemical instruments and methods, luminescent materials, and the use of gas discharge lamps, etc., can solve the problems of low excitation efficiency and poor stability of red fluorescent powder, and achieve stable, strong high temperature Stable performance, maintaining the effect of chromaticity

Active Publication Date: 2014-02-26
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
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of low excitation efficiency and poor stability in the near-ultraviolet and blue light regions of the current red phosphor used in white light LEDs, and provide a molybdenum molybdenum with high luminous efficiency, good high temperature stability, simple preparation process and no pollution. Salt red fluorescent powder and preparation method thereof

Method used

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  • Molybdate red phosphor powder applicable to white-light LED (Light-Emitting Diode) and preparation method thereof
  • Molybdate red phosphor powder applicable to white-light LED (Light-Emitting Diode) and preparation method thereof
  • Molybdate red phosphor powder applicable to white-light LED (Light-Emitting Diode) and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Preparation of Gd 1.8 Eu 0.2 Zr 3 (MoO 4 ) 9 : Take by weighing respectively according to the stoichiometric ratio of each element in the chemical formula: 0.9242g of zirconia, 0.088g of europium oxide, 3.239g of molybdenum oxide, 0.8156g of gadolinium oxide, and mix all the raw materials taken by weighing in an agate mortar; The mixture was pre-fired in a muffle furnace at 250°C for 10 hours, cooled to room temperature; mixed evenly again, calcined in a muffle furnace at 550°C for 78 hours, cooled to room temperature, and mixed uniformly to obtain a red phosphor.

[0041] See attached figure 1 , which is the sample Gd provided in this example 1.8 Eu 0.2 Zr 3 (MoO 4 ) 9 The X-ray diffraction pattern is completely consistent with PDF#54-0052, and the obtained sample is a single phase.

[0042] See attached figure 2 , which is the sample Gd provided in this example 1.8 Eu 0.2 Zr 3 (MoO 4 ) 9 The excitation and emission spectra of the sample can be seen fr...

Embodiment 2

[0046] According to the chemical formula Gd 1.6 Eu 0.4 Zr 3 (MoO 4 ) 9 The stoichiometric ratio of each element in the formula was weighed respectively: 0.9242g of zirconia, 0.176g of europium oxide, 3.239g of molybdenum oxide, and 0.7250g of gadolinium oxide. Mix all the weighed raw materials in an agate mortar; The material was pre-fired in a muffle furnace at 300°C for 9 hours, cooled to room temperature; mixed evenly again, calcined in a muffle furnace at 600°C for 75 hours, cooled to room temperature, and mixed uniformly to obtain a red phosphor. Its structural properties, excitation spectrum and emission spectrum are similar to Example 1.

Embodiment 3

[0048] According to the chemical formula La 1.8 Eu 0.2 Zr 3 (MoO 4 ) 9 The stoichiometric ratio of each element in the formula was weighed respectively: 0.9242g of zirconia, 0.088g of europium oxide, 3.239g of molybdenum oxide, and 0.7331g of lanthanum oxide. Mix all the weighed raw materials in an agate mortar; The material was pre-fired in a muffle furnace at 350°C for 8 hours, cooled to room temperature; mixed evenly again, calcined in a muffle furnace at 650°C for 70 hours, cooled to room temperature, and mixed uniformly to obtain a red phosphor.

[0049] See attached Figure 5 , which is the sample La provided in this example 1.8 Eu 0.2 Zr 3 (MoO 4 ) 9 The X-ray diffraction pattern of , compared with PDF #52-0688, yielded a pure phase.

[0050] See attached Image 6 , which is the sample La provided in this example 1.8 Eu 0.2 Zr 3 (MoO 4 ) 9 It can be seen from the excitation spectrum (Figure a) obtained by monitoring the emission light at 616nm of the sam...

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Abstract

The invention discloses a molybdate red phosphor powder applicable to a white-light LED (Light-Emitting Diode) and a preparation method thereof. The chemical formula of the molybdate red phosphor powder is RIII2-2xEu2xZr3(MoO4)9, wherein RIII is at least one of the following tervalent rare earth ions: La<3+>, Ce<3+>, Pr<3+>, Nd<3+>, Sm<3+>, Eu<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 the mole percent coefficient of doped Eu<3+> and is greater than or equal to 0.0001 and less than or equal to 1.0. The red phosphor powder disclosed by the invention has strong excitation around a position of 400nm, can be well matched with the emission wavelength of a near ultraviolet LED chip, is high in luminous efficiency and is good in thermal stability; and under the activation of near ultraviolet, the phosphor powder can emit bright red fluorescent light, has main emission wavelength of 617nm and is applicable to the white-light LED.

Description

technical field [0001] The invention relates to a fluorescent material and a preparation method thereof, in particular to a trivalent europium ion Eu which is suitable for white light LED applications. 3+ Activated molybdate red phosphor and preparation method thereof. Background technique [0002] The brightness and light color of the LED are adjustable, which can meet the color requirements of interior decoration lighting. It is easy to carry out dynamic control, and the cluster control can be preset according to the needs of users. The LED is small in size, more decorative, and has a long life. HG. There are two main forms of realization of white light LED: one is to combine red, green and blue LEDs to produce white light; Phosphors and red phosphors, or use blue LEDs to match green and red phosphors, or use purple or ultraviolet LEDs to excite red, green, and blue phosphors. [0003] At present, the luminous efficiency of white LEDs combined with blue LEDs and YAG pho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78
CPCY02B20/181Y02B20/00
Inventor 黄彦林杜福平
Owner 扬州科丰高新产业投资开发集团有限公司
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