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Green phosphor for white light LED and preparation thereof

A technology of green fluorescent and fluorescent powder, applied in the direction of chemical instruments and methods, luminescent materials, gas discharge lamps, etc., can solve the problems of low luminous brightness and high cost, achieve low reaction temperature, easy operation, and increase emission intensity Effect

Active Publication Date: 2009-07-22
昆山艺全夜光材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the luminous brightness of nitrogen oxide green phosphor and nitride red phosphor is low, and the cost is high
As a white LED fluorescent material, there are still great limitations

Method used

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  • Green phosphor for white light LED and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 3.8974 g of CaO, SiO 2 2.4034 g, MgO 0.403 g, CaCl 2 2.2197 g, Eu 2 o 3 0.176 g, MnCl 2 4H 2 O 0.0099 g, Li 2 CO 3 0.0032 grams, fully grind and mix, then put the mixed materials into an alumina crucible, and then put them into a larger crucible, place an appropriate amount of activated carbon between the two crucibles, and cover the outer crucible. Put it into a box-type resistance furnace for calcination, keep it at 1250°C for 4 hours, the heating rate is about 5°C / min, and cool it down to room temperature naturally after the heat preservation is over. The calcined bulk powder is taken out, mechanically crushed, washed with distilled water, dried at 90°C, and finally crushed with a jet mill until the average particle size reaches 4±0.5um to obtain a finished fluorescent powder.

Embodiment 2

[0022] Weigh 3.8974 g of CaO, SiO 2 2.4034 g, MgO 0.403 g, CaCl 2 2.2197 g, Eu 2 o 3 0.176 g, Dy 2 o 3 0.0186 g, Li 2 CO 3 0.0035 grams, fully grind and mix, then put the mixed materials into an alumina crucible, and then put them into a larger crucible, place an appropriate amount of activated carbon between the two crucibles, and cover the outer crucible. Put it into a box-type resistance furnace for calcination, keep it at 1250°C for 4 hours, the heating rate is about 5°C / min, and cool it down to room temperature naturally after the heat preservation is over. The calcined bulk powder is taken out, mechanically crushed, washed with distilled water, dried at 90°C, and finally crushed with a jet mill until the average particle size reaches 4±0.5um to obtain a finished fluorescent powder.

Embodiment 3

[0024] Weigh CaCO 3 4.14 g, SiO 2 1.44 g, MgO 0.2418 g, CaCl 2 1.332 g, Eu 2 o 3 0.1056 g, BaF 2 0.0726g, boric acid 0.1452g, Li 2 CO 30.0041 grams, fully grind and mix, then put the mixed materials into an alumina crucible, and then put them into a larger crucible, place an appropriate amount of activated carbon between the two crucibles, and cover the outer crucible. Put it into a box-type resistance furnace for calcination, keep it at 1250°C for 4 hours, the heating rate is about 5°C / min, and cool it down to room temperature naturally after the heat preservation is over. The calcined bulk powder is taken out, mechanically crushed, washed with distilled water, dried at 90°C, and finally crushed with a jet mill until the average particle size reaches 4±0.5um to obtain a finished fluorescent powder.

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Abstract

The invention relates to green phosphor powder for white light LED and a preparation method thereof. The chemical composition general formula of the involved phosphor powder is as follows: (A9-m-u-vBm)(Si4-nMn)O16-m / 2-n / 2X2:uEu, vR, wherein, A is one or a plurality of alkaline earth metals such as Mg, Ca, Sr and Ba; R is one or a plurality of metals such as Zn, Mn, Y, Gd, Tb, Yb, Dy, Ce, Ho, Pr, Bi, Sn and Ti; B is one or a plurality of alkali metals such as Li, Na and K; M is one or a plurality of B, Al and Ga, and X is one or a plurality of F, Cl, Br and I; wherein, m is more than or equal to 0.0001 and less than or equal to 1; n is more than or equal to 0 and less than or equal to 1; u is more than or equal to 0.03 and less than or equal to 0.6; v is more than or equal to 0 and less than or equal to 0.5; the boric acid and excessive alkaline earth metal halide serve as latent solvent; the hydroxide, oxide or corresponding salt in the above structure is selected to be raw material, burned for 2 to 5 hours in the reducing gas of 1000 to 1300 DEG C, and cooled to obtain phosphor powder for white light LED after final treatment. The phosphor powder emits green light under the excitation of the ultraviolet light, near ultraviolet light or blue light, and can serve as phosphor powder for white light LED excitated by blue light or ultraviolet light. The phosphor powder has the advantages of high luminous intensity, simple manufacturing method, wide excitation wavelength, no pollution, low cost, etc.

Description

technical field [0001] The invention relates to a green fluorescent powder for white light LEDs and a preparation method thereof. Background technique [0002] LED has many advantages: energy saving (20% of incandescent lamp with the same luminous brightness, 50% of fluorescent lamp), environmental protection (shock resistance, impact resistance, not easy to break, waste can be recycled), small size, all solid state, low calorific value (no heat radiation, Low power consumption), low voltage and low current start-up life (more than 1000 hours), fast response (can be operated at high frequency), and planar packaging can be easily developed into thin, light and compact products, etc. It has been used as a backlight for liquid crystal displays, indicator lights, and general lighting. With the global rise of the semiconductor lighting business of light-emitting diodes (LEDs), white LEDs have attracted great attention as a new generation of light sources. [0003] A yellow phos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/86
CPCY02B20/181Y02B20/00
Inventor 李瑞王晶晶
Owner 昆山艺全夜光材料科技有限公司