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Fluorescent powder material, preparation method thereof and white light LED electric light source

A technology of phosphors and powders, applied in the directions of luminescent materials, chemical instruments and methods, circuits, etc., can solve the problems of low luminous intensity of fluorescent powders and inability to produce high-brightness white LEDs, etc., to improve luminous efficiency and improve mobile luminescence Wavelengths, effects of improving and shifting emission wavelengths

Active Publication Date: 2012-05-09
BEIJING YUJI SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the luminous intensity of the phosphor powder prepared by the solid-state reaction method is low, and a practical white light LED with high brightness cannot be produced.

Method used

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  • Fluorescent powder material, preparation method thereof and white light LED electric light source
  • Fluorescent powder material, preparation method thereof and white light LED electric light source
  • Fluorescent powder material, preparation method thereof and white light LED electric light source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Phosphor (Tb 1.9 Y 0.5 Gd 0.5 Ce 0.1 )Al 5 O 12 Example of preparation

[0043] Select the raw materials according to the chemical structure formula of the above phosphors, the raw materials are selected from Tb 4 O 7 , Y(NO 3 ) 3 ·6H 2 O, Gd 2 O 3 , Ce(NO 3 ) 3 ·6H 2 O, Al(NO 3 ) 3 ·9H 2 O. Tb 4 O 7 , Gd 2 O 3 Dissolve in nitric acid to make the corresponding nitrate, then dissolve all the nitrate in deionized water to form an aqueous solution, control the concentration of the reactant to 2mol / L, and the acidity pH to 4.5. Add urea to the above solution to adjust The pH of the aqueous solution is 10.5, the concentration of the precipitating agent is 1mol / L, and it is stirred at 90°C to form a white jelly. The white jelly is calcined in the air at 900°C for 30 minutes to obtain the precursor. 50nm. Add flux HBO to the precursor 3 , The flux content is 5% of the total precursor. After mixing uniformly, place the mixture in the crucible, 2 -H 2 The calcination is...

Embodiment 2-11

[0044] Example 2-11: Weigh the corresponding raw materials according to the chemical formula composition and stoichiometry of each example in Table 1. The preparation process is the same as that of Example 1. The emission peak and luminous intensity obtained under the excitation of 460nm wavelength light are shown in the table 1.

[0045] Table 1 Chemical formulas and luminescence characteristics of Examples 1-11

[0046] Example Chemical formula Emission peak light intensity 1(Tb 1.9 Y 0.5 Gd 0.5 Ce 0.1 )Al 5 O 12 541 1.6 2(Tb 2.9 Ce 0.1 )Al 5 O 12 562 1.5 3(Tb 2.4 Gd 0.5 Ce 0.1 )Al 5 O 12 551 1.4 4(Tb 2.4 Y 0.5 Ce 0.1 )Al 5 O 12 538 1.5 5(Tb 1.9 Y 0.5 Nd 0.5 Ce 0.1 )Al 5 O 12 539 0.8 6(Tb 1.9 Y 0.5 Lu 0.5 Ce 0.1 )Al 5 O 12 542 1.1 7(Tb 1.9 Y 0.5 La 0.5 Ce 0.1 )Al 5 O 12 543 0.9 8(Tb 1.9 Y 0.5 Sm 0.5 Ce 0.1 )Al 5 O 12 547 1.0 9(Tb 1.9 Y 0.5 Dy 0.5 Ce 0.1 )Al 5 O 12 542 0.7 10...

Embodiment 14

[0047] Example 14: Phosphor (Tb 1.7 Y 0.5 Gd 0.5 Lu 0.3 Ce 0.1 )(Al 3.5 Ga 1.0 In 0.5 )O 12 Example of preparation

[0048] Select the raw materials according to the chemical structure formula of the above phosphors, the raw materials are selected from Tb 4 O 7 , Y(NO 3 ) 3 ·6H 2 O, Gd 2 O 3 , Lu 2 O 3 , Ce(NO 3 ) 3 ·6H 2 O, Al(NO 3 ) 3 ·9H 2 O, In 2 O 3 , Ga 2 O 3 . Tb 4 O 7 , Lu 2 O 3 , Gd 2 O 3 , In 2 O 3 , Ga 2 O 3 Dissolve in nitric acid to make the corresponding nitrate, then dissolve all the nitrate in deionized water to form an aqueous solution, control the concentration of the reactant to 2mol / L, and the acidity pH to 4.5. Add ammonia water to the above solution to adjust the pH of the aqueous solution to 10.5 and the concentration of the precipitation agent to 2mol / L, and stir at 90°C to finally form a white gum. The white jelly was calcined in the air at 900℃ for 30min to obtain a precursor with a particle size of 50nm. Add flux HBO to the precursor 3 , The content of ...

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Abstract

The present invention provides one kind of green, green yellow or yellow phosphor powder for use in white light LED. The phosphor powder has the chemical formula of (Tb3-a-bM'aCeb)(Al5-cM''c)O12, where, M' is one or several of Y, Lu, Gd, La, Pr, Sm, Dy and Yb; M'' is one or several of Ga, Ge, B, Si, In and Zn; a is 0-3, b is 0.01-0.3, and c is 05. The phosphor powder is in YAG structure, and canemit high brightness fluorescence of 538-585 nm wavelength when excited with blue light source, such as LED, of 430-480 nm wavelength. The present invention also provides white light LED source with the phosphor powder and blue LED, and the preparation process of the phosphor powder.

Description

technical field [0001] The invention relates to a luminescent material and its preparation technology and application. The luminescent material can be excited by ultraviolet light to blue light in the spectral region to emit green, yellow-green or yellow light, especially a phosphor material. The phosphor material A preparation method, and a white LED electric light source prepared by matching the fluorescent powder material with a blue LED chip. Background technique [0002] GaN-based light-emitting diode (Light-Emitting Diode) is a new type of light-emitting device known as solid-state lighting in the next century. It has the advantages of small size, power saving, long life, no mercury that pollutes the environment, high efficiency, and low maintenance. , can be widely used in various lighting facilities, including indoor lighting, traffic signals / indicators, car taillights / headlights, super large outdoor screens, display screens and advertising screens, etc., which can r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/00C09K11/80H01L33/50
CPCY02B20/181Y02B20/00
Inventor 蔺向阳鲍鹏
Owner BEIJING YUJI SCI & TECH
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