Red fluoresent material, and preparing technique

A red phosphor powder and phosphor technology, applied in the preparation of the red phosphor powder, in the field of red phosphor powder, can solve the problems of difficult to achieve satisfactory particle size, influence of ball milling luminous efficiency, wide product particle size distribution, etc., and achieve easy operation control, Conducive to the expansion of large-scale production, the effect of high luminous efficiency

Inactive Publication Date: 2007-10-10
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its disadvantage is that the synthesis temperature is too high. After ball milling, the particle size distribution of the product is wide, and it is difficult to achieve a satisfactory particle size. Moreover, ball milling has a significant impact on its luminous efficiency, resulting in certain restrictions on its application.

Method used

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  • Red fluoresent material, and preparing technique
  • Red fluoresent material, and preparing technique
  • Red fluoresent material, and preparing technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: take by weighing 22.2g Li 2 CO 3 , 104.56g Eu 2 o 3 Dissolve in an appropriate amount of nitric acid to make a nitrate solution, weigh 331.08g H 4 SiW 12 o 40 ·nH 2 O is made into an aqueous solution, then the two are mixed, and diluted to 1000ml with deionized water to obtain a clear precursor solution, which has a pH value of 3 and is added to the atomization device. Raise the intelligent temperature-raising reaction furnace to 1100°C, feed air into the reaction system, and control the gas flow rate at 15L / min. Start the atomization device, the aerosol generated by the precursor solution enters the reaction system with the airflow, and the LiEu(SiO 2 ) 1 / 6 W 2 o 8 The fluorescent powder is collected by the collection device, and the tail gas is discharged after being processed by the tail gas treatment device. The collected fluorescent powder is washed twice, dehydrated and dried to obtain the finished product. Observing its morphology with a...

Embodiment 2

[0027] Embodiment 2: take by weighing 19.98g Li 2 CO 3 , 3.08 g Na 2 CO 3 , 104.56g Eu 2 o 3 Dissolve in an appropriate amount of nitric acid to make a nitrate solution, weigh 331.08g H 4 SiW 12 o 40 ·nH 2 O is dissolved into an aqueous solution, then the two are mixed, and diluted to 1000ml with deionized water to obtain a clear precursor solution. The preparation method is the same as in Example 1, and the chemical formula is (Li 0.9 Na 0.1 )Eu(SiO 2 ) 1 / 6 W 2 o 8 phosphor, its luminous intensity is comparable to that of LiEu(SiO 2 ) 1 / 6 W 2 o 8 Compared with phosphor, there is a slight change, as shown in Table 1.

Embodiment 3

[0028] Embodiment 3: take by weighing 22.2g Li 2 CO 3 , 101.36g Eu 2 o 3 , 4.18g Sm 2 o 3 Dissolve in an appropriate amount of nitric acid to make a nitrate solution, weigh 331.08g H 4 SiW 12 o 40 ·nH 2 O is dissolved into an aqueous solution, then the two are mixed, and diluted to 1000ml with deionized water to obtain a clear precursor solution. The preparation method is the same as in Example 1, and the chemical formula is Li(Eu 0.96 SM 0.04 ) (SiO 2 ) 1 / 6 W 2 o 8 Phosphor powder, its luminous intensity is obviously improved compared with Example 1, and its main emission peak is shifted to the long wave direction. As shown in Table 1.

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Abstract

This invention relates to a spray-pyrolysis process for preparing red fluorescent powder, whose chemical formula is (Li1-aNaa) (Eu1-b-c-dSmbYcGdd)(SiO2)1/6(W1-mMom)2O8, wherein, a is 0-0.8; b is 0-0.08; c is 0-0.08; d is 0-0.08; m is 0-1. The spray-pyrolysis process comprises: weighing soluble compounds of the cations according to the above chemical formula, preparing clear precursor solution, atomizing, reacting, and collecting the red fluorescent powder. The red fluorescent powder is approximately spherical, and has such advantages as high crystallinity, uniform particle size distribution, smooth particle surface, high luminescent efficiency, and high color purity. The spray-pyrolysis process has such advantages as simple process, easy operation, and high production efficiency, and is suitable for continuous production.

Description

technical field [0001] The invention belongs to the field of luminescent materials and relates to a red fluorescent powder excited by purple light. The invention also relates to a preparation method of the red fluorescent powder. Background technique [0002] White light LED has the advantages of small size, low calorific value, low power consumption, long life, fast response, environmental protection, planar packaging, and easy development into thin, light and small products. The fourth-generation lighting source, which may replace traditional lighting in the future, has a very broad application prospect. At present, the form of white LED realization is mainly to use LED to excite the matching luminescent material to form white light, that is, use blue LED with yellow phosphor, or use blue LED with green phosphor and red phosphor, or use purple LED with red, Green and blue phosphors. The red phosphor used plays an important role in modulating the color temperature of whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79
Inventor 王海波井艳军朱宪忠
Owner NANJING UNIV OF TECH
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