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Europium dysprosium co-doped tungstate red fluorescent powder for white light LED and preparation method of europium dysprosium co-doped tungstate red fluorescent powder

A red phosphor powder and co-doping technology, which is applied in the field of fluorescent materials, can solve the problems of low color rendering index, lack of red components, and low luminous efficiency of white LEDs, achieve low calcining temperature, abundant raw material resources, and improve display efficiency. Effect of color index and color temperature

Pending Publication Date: 2021-10-01
上海同晔科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main way to commercialize white LEDs is to combine blue InGaN chips with yellow Y 3 Al 5 o 12 : Ce 3+ Combining the phosphor powder, the blue light generated by the LED chip and the yellow light generated by the phosphor powder are combined to obtain white light. However, due to the lack of red components in the emission spectrum of the phosphor powder, the color rendering index of the white LED is low (Ra7000K)
With the development of near-ultraviolet chips, the way of using ultraviolet LED chips + three primary colors (red, green, blue) phosphors to obtain white light can effectively improve the problems of low color rendering index and high color temperature of white LEDs. The red, green and blue primary color phosphors are mainly Y 2 o 2 S: Eu 3+ Red phosphor, ZnS: Cu+, Al 3+ Green phosphor and BaMgAl 10 o 17 : Eu 2+ Blue phosphor, but compared with blue phosphor and green phosphor, red phosphor has the problems of low luminous efficiency and poor thermal stability

Method used

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  • Europium dysprosium co-doped tungstate red fluorescent powder for white light LED and preparation method of europium dysprosium co-doped tungstate red fluorescent powder
  • Europium dysprosium co-doped tungstate red fluorescent powder for white light LED and preparation method of europium dysprosium co-doped tungstate red fluorescent powder
  • Europium dysprosium co-doped tungstate red fluorescent powder for white light LED and preparation method of europium dysprosium co-doped tungstate red fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] use as figure 1 LiSrGd was prepared by the traditional high-temperature solid-state method shown in 0.97 (WO 4 ) 3 :0.01Eu 3+ ,0.02Dy 3+ Phosphor powder, the steps are as follows:

[0041] (1) Weighing: according to the target product LiSrGd 0.97 (WO 4 ) 3 :0.01Eu 3+ ,0.02Dy 3+ Calculate the stoichiometric ratio in the fluorescent powder to obtain the amount of each raw material, and use an electronic balance to obtain a suitable quality of raw material;

[0042] (2) Mix evenly: Mix the raw materials evenly and put them into an agate mortar, add absolute ethanol and grind for 1 hour, after the absolute ethanol evaporates cleanly, grind the raw materials evenly and place them in a corundum crucible, and dry them completely in an electronic drying oven;

[0043] (3) High temperature sintering: put the dried sample together with the corundum crucible into a high temperature box furnace, and calcinate at 900°C for 4 hours;

[0044] (4) Secondary grinding: After t...

Embodiment 2

[0053] Preparation of LiSrGd in this embodiment 0.9 (WO 4 ) 3 :0.05Eu 3+ , 0.05 Dy 3+ Phosphor powder, the steps are as follows:

[0054] (1) Weighing: according to the target product LiSrGd 0.9 (WO 4 ) 3 :0.05Eu 3+ , 0.05 Dy 3+ The stoichiometric ratio in the phosphor is used to calculate the amount of raw materials for compounds containing Li, Sr, Gd, W, Eu, and Dy elements, and use an electronic balance to obtain raw materials of appropriate quality;

[0055] (2) Mix evenly: mix the raw materials evenly and put them in an agate mortar, add absolute ethanol and grind for 0.5h, after the absolute ethanol evaporates, put the raw materials evenly in a corundum crucible, and dry them completely in an electronic drying oven;

[0056] (3) High-temperature sintering: put the dried sample together with the corundum crucible into a high-temperature box furnace, and calcinate at 850°C for 3 hours;

[0057] (4) Secondary grinding: After the reaction is completely completed, t...

Embodiment 3

[0060] Preparation of LiSrGd in this embodiment 0.98 (WO 4 ) 3 :0.01Eu 3+ ,0.01Dy 3+ Phosphor powder, the steps are as follows:

[0061] (1) Weighing: according to the target product LiSrGd 0.98 (WO 4 ) 3 :0.01Eu 3+ ,0.01Dy 3+ Calculate the stoichiometric ratio in the phosphor to obtain the amount of raw materials for compounds containing Li, Sr, Gd, W, Eu, and Dy elements, and use an electronic balance to obtain raw materials of appropriate quality;

[0062] (2) Mix evenly: Mix the raw materials evenly and put them into an agate mortar, add absolute ethanol and grind for 1.5 hours, after the absolute ethanol evaporates, put the raw materials evenly in a corundum crucible, and dry them completely in an electronic drying oven;

[0063] (3) High temperature sintering: put the dried sample together with the corundum crucible into a high temperature box furnace, and calcinate at 950°C for 5 hours;

[0064] (4) Secondary grinding: After the reaction is completely complete...

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Abstract

The invention discloses europium and dysprosium co-doped tungstate red fluorescent powder for a white light LED and a preparation method of the europium and dysprosium co-doped tungstate red fluorescent powder, and belongs to the technical field of fluorescent materials. The chemical general formula of the red fluorescent powder is LiSrGd1-x-y(WO4)3:xEu3+,yDy3+, x and y are mole fractions, x is greater than 0 and less than or equal to 0.05, and y is greater than 0 and less than or equal to 0.05; raw materials are weighed according to the stoichiometric ratio of the chemical general formula LiSrGd1-x-y(WO4)3:xEu3+,yDy3+ and mixed uniformly, absolute ethyl alcohol is added, grinding and drying are performed, high-temperature calcination is performed at 850-950 DEG C for 3-5 hours, natural cooling is performed to room temperature, and secondary grinding is performed uniformly to obtain the red fluorescent powder. The tungstate red fluorescent powder is rich in raw materials, good in physicochemical stability, ideal in fluorescence lifetime, green and pollution-free, and can effectively improve the color rendering index and color temperature and improve the luminous efficiency when being used as a white light LED device excited by a blue light / near ultraviolet light chip.

Description

technical field [0001] The invention belongs to the technical field of fluorescent materials, and in particular relates to a tungstate red fluorescent powder for a europium-dysprosium co-doped white light LED and a preparation method thereof. Background technique [0002] White light-emitting diodes (LEDs) have the advantages of high brightness, energy saving, long life, small size and high reliability, and are considered to be the fourth generation of green light sources after incandescent lamps, fluorescent lamps and high-intensity gas discharge lamps. At present, the main way to commercialize white LEDs is to combine blue InGaN chips with yellow Y 3 al 5 o 12 : Ce 3+ Combining the phosphor powder, the blue light generated by the LED chip and the yellow light generated by the phosphor powder are combined to obtain white light. However, due to the lack of red components in the emission spectrum of the phosphor powder, the color rendering index of the white LED is low (Ra...

Claims

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Application Information

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IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7794H01L33/502Y02B20/00
Inventor 叶辉华刘红刘付
Owner 上海同晔科技有限公司
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