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Blue luminescent material for white light LED and novel preparation method thereof

A blue fluorescence, white light technology, applied in the field of phosphate blue fluorescent materials, can solve the problems of long preparation time, high reaction temperature, difficult to control conditions, etc., and achieve stable physical and chemical properties, good chemical stability, and conditions Easy-to-control effects

Inactive Publication Date: 2011-10-05
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, high-temperature solid-phase synthesis is used to synthesize fluorescent materials in the sulfide system. The reaction temperature is high, the preparation time is long, and the energy consumption is large. Secondary luminous properties
However, the preparation process of the sol-gel method is complicated and the conditions are difficult to control, which leads to unstable physical and chemical properties of the prepared fluorescent materials.

Method used

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  • Blue luminescent material for white light LED and novel preparation method thereof
  • Blue luminescent material for white light LED and novel preparation method thereof
  • Blue luminescent material for white light LED and novel preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: NaBa 0.999 PO 4 :0.001Eu 2+ preparation of

[0043] Weigh each raw material with stoichiometric ratio according to the above chemical composition formula, that is, weigh 0.0026g of Eu 2 o 3 , dissolved in concentrated nitric acid to obtain a rare earth metal europium ion solution; weigh 1.2749g of NaNO 3 , 3.9162g of Ba(NO 3 ) 2 , 1.7255g of NH 4 h 2 PO 4 And the boric acid of 0.0464g is dissolved with deionized water to obtain the corresponding mixed ion solution.

[0044] The rare earth ion solution and the mixed ion solution were mixed and electromagnetically stirred for 5 minutes. Then 3.2432 g of urea was added, and electromagnetic stirring was continued for 5 minutes. Then a mixed solution containing rare earth metal europium ions is obtained. The solution containing the rare earth metal europium ions was poured into a porcelain crucible, and the moisture in the solution was dried in an oven at 80°C. Then the porcelain crucible was placed i...

Embodiment 2

[0048] Example 2: NaBa 0.995 PO 4 :0.005Eu 2+ preparation of

[0049] Weigh each raw material with stoichiometric ratio according to the above chemical composition formula, that is, weigh 0.0132g of Eu 2 o 3 , dissolved in concentrated nitric acid to obtain a rare earth metal europium ion solution; weigh 1.2749g of NaNO 3 , 3.900g of Ba(NO 3 ) 2 , 1.7255g of NH 4 h 2 PO 4 And the boric acid of 0.0464g is dissolved in deionized water to obtain a mixed solution of corresponding ions.

[0050] The rare earth metal europium ion solution and the mixed ion solution were mixed and electromagnetically stirred for 5 minutes. Then 3.2432 g of urea was added, and electromagnetic stirring was continued for 5 minutes. Then a mixed solution containing rare earth metal europium ions is obtained. The mixed solution containing rare earth metal europium ions was poured into a porcelain crucible, and the moisture in the solution was dried in an oven at 80°C. Then place it in a muffl...

Embodiment 3

[0052] Example 3: NaBa 0.99 PO 4 :0.01Eu 2+ preparation of

[0053]Weigh each raw material with stoichiometric ratio according to the above chemical composition formula, that is, weigh 0.0264g of Eu 2 o 3 , dissolved in concentrated nitric acid to obtain a rare earth metal europium ion solution; weigh 1.2749g of NaNO 3 , 3.8809g of Ba(NO 3 ) 2 , 1.7255g of NH 4 h 2 PO 4 And the boric acid of 0.0464g is dissolved in deionized water to obtain the corresponding ion mixed solution.

[0054] The rare earth metal ion solution and the corresponding ion mixed solution were mixed and electromagnetically stirred for 5 minutes. Then 3.2432 g of urea was added, and electromagnetic stirring was continued for 5 minutes to obtain a mixed solution containing rare earth metal europium ions. The mixed solution containing rare earth metal europium ions was poured into a porcelain crucible, and the moisture in the solution was dried in an oven at 80°C. Then place it in a muffle furnac...

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Abstract

The invention provides a blue luminescent material for a white light LED and a novel preparation method thereof. The blue luminescent material is barium phosphonate sodium salt doped with rare earth ion Eu<2+> the chemical composition of which is NaBa(1-x)PO4:xEu<2+>, wherein x is more than or equal to 0.001 and less than or equal to 0.02, NaBa1-xPO4 is used as a base material and Eu<2+> is the doped rare earth ion. In the invention, the phosphate blue luminescent material NaBa(1-x)PO4:xEu<2+> is synthesized through a urea burning method. The phosphate blue luminescent material has strong absorption when the excitation wave length is in the range of 230-420nm, and the emitted main peak of the phosphate blue luminescent material is in the range of 430-450nm.The phosphate blue luminescent material with high luminous efficiency and good chemical stability is the novel blue luminescent material applicable to the white light LED.

Description

technical field [0001] The invention relates to a blue fluorescent material for white LEDs and a preparation method thereof. More specifically, the present invention relates to the chemical composition of NaBa 1-x PO 4 :xEu 2+ (x=0.001-0.02) phosphate blue fluorescent material and a method for preparing the phosphate blue fluorescent material. Background technique [0002] As a new generation of solid light source, white light-emitting diode (LED) not only overcomes the shortcomings of traditional incandescent and fluorescent lamps such as high energy consumption, fragility, and pollution, but also has the advantages of small size, environmental protection, fast response, long life and reliability. Planar packaging, easy to develop into thin and compact products and other advantages. Therefore, white LEDs are widely used in various lighting facilities and display panels, such as indoor and outdoor lamps, automotive display lights; indicator lights or display panels of va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/71
CPCY02B20/181Y02B20/00
Inventor 孙家跃杜海燕张翔燕夏志国
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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