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Cerium-activated silicate green fluorescent powder and preparation method thereof

A green phosphor, silicate technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of temperature quenching characteristics, particle size and distribution improvement, etc. Agglomeration, temperature quenching characteristic wide effect

Inactive Publication Date: 2012-07-18
JIANGSU BREE OPTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing technology can improve the light efficiency of phosphor to a certain extent, it is difficult to further improve its temperature quenching characteristics, particle size and distribution

Method used

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  • Cerium-activated silicate green fluorescent powder and preparation method thereof
  • Cerium-activated silicate green fluorescent powder and preparation method thereof
  • Cerium-activated silicate green fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 199.07g of CaCO3, 0.395g of BaCO3, 91.933g of Sc2O3, 122.00g of SiO2, 0.124g of NH4Cl, 1.721g of CeO2, 0.176g of Eu2O3, and 0.104g of AlN. , pulverize the calcined product, pass through 400 sieves, add citric acid solution with a mass percentage of 0.12%, and prepare a suspension with a mass percentage of 10%, heat to 80°C, stir for 60 minutes while keeping warm, and wash with deionized water After reaching neutrality, the water powder is separated and dried to obtain a green fluorescent powder with the following composition:

[0034] Ca2.986Ba0.003Sc2Si3.05O11.997Cl0.0035: Ce0.015, Eu0.0015.

Embodiment 2

[0036] Weigh 198.4g of CaCO3, 0.669g of SrCO3, 91.933g of Sc2O3, 120.92g of SiO2, 0.124g of NH4Cl, 2.983g of CeO2, 0.184g of MnCO3, and 1.266g of Si3N4. Pulverize the calcined product, pass through 400 sieves, add citric acid solution with a mass percentage of 0.25%, and prepare a suspension with a mass percentage of 15%, heat to 70°C, stir for 60 minutes while keeping warm, and wash with deionized water until After neutralization, the water powder is separated and dried to obtain a green fluorescent powder with the following composition:

[0037] Ca2.976Sr0.0068Sc2Si3.023O11.985Cl0.015:Ce0.026, Mn0.0024.

Embodiment 3

[0039] Weigh 184.134g of CaCO3, 1.893g of MgO, 91.933g of Sc2O3, 121.52g of SiO2, 0.642g of NH4Cl, 2.295g of CeO2, 0.726g of Pr6O11, 2.74g of Si3N4 (0.68%). Burn for 7 hours, crush the calcined product, pass through 400 sieves, add citric acid solution with a mass percentage of 0.30% to prepare a suspension with a mass percentage of 15%, heat to 70°C, and stir for 60 minutes while keeping warm. After washing with deionized water to neutrality, the water powder is separated and dried to obtain a green fluorescent powder with the following composition:

[0040]Ca2.762Mg0.071Sc2Si3.038O11.982Cl0.018:Ce0.02, Pr0.0064.

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Abstract

The invention discloses cerium-activated silicate green fluorescent powder and a preparation method thereof. The chemical structural formula of the cerium-activated silicate green fluorescent powder is as follows: (Ca1-x, Alx)(3-p-q)Sc2Si3+yO12-zA2z:Cep, A3q (I), wherein A1 is at least one of Ba, Sr, Mg, La and Y; A2 is at least one of Cl and F; A3 is one of Eu, Mn and Pr; x is more than 0.0001 and less than or equal to 0.5; y is more than 0.003 and less than or equal to 0.5; z is more than 0.03 and less than or equal to 0.1; p is more than or equal to 0.003 and less than or equal to 0.07; and q is more than or equal to 0.0001 and less than 0.03. The preparation method comprises the following steps: firstly, weighing reaction raw materials according to the stoichiometric ratio of a formula (I); secondly, selecting at least one of AlN, Si3N4, TiN and BN as a reaction additive which is 0.02 to 2.0 percent of the total mass of the reaction raw materials; thirdly, uniformly mixing the reaction raw materials with the reaction additive, and feeding the mixture into a reduction atmosphere furnace for firing; and fourthly, crushing the fired powder block and carrying out sieving, pickling washing, water-powder separation and drying to obtain a finished product. The cerium-activated silicate green fluorescent powder disclosed by the invention has the advantages of favorable luminous performance, temperature quenching characteristic and wider transmission bandwidth.

Description

technical field [0001] The invention relates to a cerium-activated silicate green fluorescent powder and a preparation method thereof. The fluorescent powder can be applied to a white light emitting diode. Background technique [0002] White light-emitting diodes (referred to as white LEDs) have significant advantages over traditional light sources in terms of size, lifespan, environmental protection, and energy saving. Therefore, they are expected to become the fourth-generation green lighting source to replace compact energy-saving lamps. The technical solution of using GaN blue LED and Y3Al5O12:Ce3+(YAG:Ce) yellow light-emitting phosphor as light conversion material to realize white light has become the mainstream of current white LED, and has increasingly attracted the attention of researchers all over the world. For example, US patents US5998925 and US6614179B1 adjusted and optimized the Y / Gd ratio, Al / Ga ratio, trace element doping and preparation methods. [0003] Ho...

Claims

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Application Information

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IPC IPC(8): C09K11/86H01L33/50
Inventor 梁超何锦华符义兵滕晓明刘凯
Owner JIANGSU BREE OPTRONICS CO LTD