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Phosphor powder with adjustable near-ultraviolet excitation light color by single matrix and preparation method thereof

A near-ultraviolet and excitation light technology, used in luminescent materials, chemical instruments and methods, sustainable architecture, etc., can solve the problems of insufficient mixing uniformity and light color stability, poor color rendering of light sources, complex design, etc., and achieve the preparation method. Simple and feasible, high luminous intensity, low cost effect

Active Publication Date: 2017-11-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former is expensive and complex in design, while the latter is insufficient in terms of mixing uniformity and light color stability
The second method is a combination of blue LED chips and yellow phosphors that can be effectively excited by blue light (such as commercial Y 3 Al 5 o 12 :Ce) combined, the blue light emitted by the chip and the yellow light emitted by the phosphor complement each other to form white light. Due to the lack of red components, the color rendering of the actual light source is poor

Method used

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  • Phosphor powder with adjustable near-ultraviolet excitation light color by single matrix and preparation method thereof
  • Phosphor powder with adjustable near-ultraviolet excitation light color by single matrix and preparation method thereof
  • Phosphor powder with adjustable near-ultraviolet excitation light color by single matrix and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) According to the molar ratio of Ba : Mg : Si : Eu : Ga = 0.99 : 1.99 : 2 : 0.01 : 0.01, weigh BaO and 4MgCO 3 •Mg(OH) 2 • 5H 2 O, SiO 2 、Eu 2 o 3 , Ga 2 o 3 , and then mix well;

[0020] (2) Put the mixed material obtained in step (1) into a crucible and pre-fire it at 850°C, keep it warm for 6 hours, and cool it naturally with the furnace temperature;

[0021] (3) Grind the mixed material after pre-burning in step (2) again and place it in reducing gas H 2 + N 2 After holding at 1230℃ for 10 hours, cool naturally with the furnace temperature, and after grinding, the silicate white phosphor Ba which is co-doped with europium ions and gallium ions 0.99 Eu 0.01 Mg 1.99 Ga 0.01 Si 2 o 7 .

Embodiment 2

[0023] (1) According to the molar ratio of Ba : Mg : Si : Eu : Ga = 0.98 : 1.98 : 2 : 0.02 : 0.02, weigh BaO and 4MgCO 3 •Mg(OH) 2 • 5H 2 O, SiO 2 、Eu 2 o 3 , Ga 2 o 3 , and then mix well;

[0024] (2) Put the mixed material obtained in step (1) into a crucible and pre-fire it at 600°C, keep it warm for 10 hours, and cool it naturally with the furnace temperature;

[0025] (3) Grind the pre-calcined mixed material in step (2) again and put it under reducing gas CO, keep it at 1230°C for 10 hours, then cool it naturally with the furnace temperature, and get co-doped with europium ions and gallium ions after grinding Silicate white phosphor Ba 0.98 Eu 0.02 Mg 1.98 Ga 0.02 Si 2 o 7 .

Embodiment 3

[0027] (1) According to the molar ratio of Ba : Mg : Si : Eu : Ga = 0.96 : 1.96 : 2 : 0.04 : 0.04, weigh BaCO 3 , MgO, SiO 2 、Eu 2 o 3 , Ga 2 o 3 , and then mix well;

[0028] (2) Put the mixed material obtained in step (1) into a crucible and pre-fire it at 850°C, keep it warm for 6 hours, and cool it naturally with the furnace temperature;

[0029] (3) Grind the mixed material after pre-burning in step (2) again and place it in reducing gas H 2 + N 2 After holding at 1230℃ for 10 hours, cool naturally with the furnace temperature, and after grinding, the silicate white phosphor Ba which is co-doped with europium ions and gallium ions 0.96 Eu 0.04 Mg 1.96 Ga 0.04 Si 2 o 7 .

[0030] attached figure 1 is in reducing gas H 2 + N 2 The silicate white phosphor Ba 0.96 Eu 0.04 Mg 1.96 Ga 0.04 Si 2 o 7 X-ray powder diffraction pattern. The phase search found that the diffraction peaks of the obtained products all corresponded to the standard card JCPDS10-00...

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Abstract

The invention relates to single-matrix near ultraviolet excited light color adjustable fluorescent powder and a preparation method thereof. The chemical composition formula of the fluorescent powder is Ba1-xMg2-ySi2O7: Eux, Gay, wherein 0<x<1, 0<y<1. The fluorescent powder is characterized in that europium (Eu) ions and gallium (Ga) ions are doped at the same time, and emitting color can be regulated by changing the relative component ratio of Ba to Mg to Eu to Ga, wherein strong white light emission under near ultraviolet excitation is included. The fluorescent powder can be prepared through a conventional solid phase method, and a reduction reaction / treatment is needed in the preparation process and can be realized by simply utilizing H2 or CO or the like. The fluorescent powder can achieve bright white light emission of a single matrix under near ultraviolet excitation, and is good in color rendering property, high in chemical stability, simple in preparation method, low in material cost and quite suitable for industrial mass production.

Description

technical field [0001] The invention relates to a fluorescent powder with adjustable near-ultraviolet excitation light color of a single matrix and a preparation method thereof. Background technique [0002] White LED is the fourth-generation light source after incandescent lamps, fluorescent lamps, and high-intensity gas discharge lamps, and is recognized as a new type of light source in the 21st century. Compared with traditional light sources, white LEDs have the advantages of small size, long life, high luminous efficiency, energy saving, and environmental protection. They can be used in mobile communications, urban landscapes, car lights, signal lights, liquid crystal displays, and lighting. [0003] There are three ways to achieve white LED. The first method is to assemble red, green, and blue primary color LED chips together, or use a variety of phosphors to match to achieve white light. The former is expensive and complex in design, while the latter has deficiencie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59
CPCC09K11/7734Y02B20/00
Inventor 雷芳肖维勤施鹰谢建军章蕾
Owner SHANGHAI UNIV
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