Electron beam excited red phosphor and preparation method thereof

A technology of red phosphor and electron beam, which is applied in the field of red phosphor, can solve the problems affecting cathode emission capability and device life, luminous intensity and efficiency reduction, FED cathode pollution, etc., to achieve the benefit of cathode electron emission capability and device life, Good luminous consistency and good color effect

Active Publication Date: 2017-06-16
合肥名龙电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Sulfur-containing compounds, such as: Y 2 o 2 S:Eu, ZnS:Cu,Au,Al, ZnS:Ag,Cl, etc., the brightness and chromaticity basically meet the requirements, but because the sulfur contained in it pollutes the FED cathode, affecting the cathode electron emission ability and device life
In recent years, some new sulfur-containing compounds have been explored, such as SrGa 2 S 4 : Ce, SrGa 2 S 4 :Eu, SrY 2 S 4 : Eu, etc., high brightness, but still has the disadvantage of poor stability
Non-sulfur-containing compounds are mainly oxygen-containing compounds, such as: Y 2 o 3 : Eu, Y 3 al 5 o 12 : Tb, etc., stable chemical properties, but high turn-on voltage, and at the same time, under the working conditions of low voltage and high current, electrons are easy to gather on the surface of the phosphor layer, weakening the electric field intensity and changing the electric field distribution, resulting in a significant reduction in luminous intensity and efficiency

Method used

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  • Electron beam excited red phosphor and preparation method thereof
  • Electron beam excited red phosphor and preparation method thereof
  • Electron beam excited red phosphor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] According to the chemical composition formula: (Sn 0.78 Sb 0.20 Eu 0.02 )O 2 , Respectively weigh out 0.078molSnCl 4 ·5H 2 O, 0.020mol SbCl 3 , 0.002mol EuCl 3 ·6H 2 O. Prepare a clear and transparent mixed salt solution A in vessel 1, and adjust the cation concentration to 0.4mol / L. Use hydrochloric acid to adjust the pH of the mixed salt solution A to 1.5, and heat to 85°C and keep it warm. Add 500 ml of deionized water to the vessel 2, adjust the pH of the water to 7.2 with concentrated ammonia water, heat it to 85°C, and keep it warm. The mixed salt solution A in vessel 1 was dropped into vessel 2 at a rate of 120 ml / min. During the reaction, the temperature was controlled, stirring was continued, and the pH of the emulsion was controlled to 7.2 by concentrated ammonia. After the reaction is over, continue to stir for half an hour and let stand for 24 hours. Use deionized water with a pH of 7.2 at 50°C and adjusted by ammonia water as the cleaning solution. The emul...

Embodiment 2

[0034] According to the chemical composition formula: (Sn 0.86 Sb 0.06 Eu 0.08 )O 2 , Weigh out 0.086mol SnCl 4 ·5H 2 O, 0.006mol SbCl 3 , 0.008mol EuCl 3 ·6H 2 O. Prepare a clear and transparent mixed salt solution A in the vessel 1, and adjust the cation concentration to 3.5mol / L. The mixed salt solution A uses nitric acid to adjust the PH value, the pH value is 0.2, and it is heated to 50°C and kept warm. Add 50 ml of deionized water to the vessel 2, adjust the pH of the water to 9.5 with potassium hydroxide solution, heat it to 50°C, and keep it warm. The mixed salt solution A in vessel 1 was dropped into vessel 2 at a rate of 1 ml / min. During the reaction, the temperature was controlled and stirring was continued, and the pH of the emulsion was controlled to be 9.5 by potassium hydroxide solution. After the reaction is over, continue to stir for half an hour and let stand for 24 hours. Use deionized water with a pH of 9.0 at 50°C and adjusted by ammonia water as the cleani...

Embodiment 3

[0036] According to the chemical composition formula: (Sn 0.84 Al 0.10 Eu 0.06 )O 2 , Weigh out 0.086mol SnCl 4 ·5H 2 O, 0.010mol Al(NO 3 ) 3 ·9H 2 O, 0.006mol EuCl 3 ·6H 2 O. Prepare a clear and transparent mixed salt solution A in vessel 1, and adjust the cation concentration to 0.8 mol / L. The mixed salt solution A uses nitric acid to adjust the pH value to 0.5, and heat to 75°C and keep it warm. Add 50 ml of deionized water to the vessel 2, adjust the pH of the water to 8.5 with concentrated ammonia water, heat it to 50°C, and keep it warm. The mixed salt solution A in vessel 1 was dropped into vessel 2 at a rate of 10 ml / min. During the reaction, the temperature was controlled and stirring was continued, and the pH of the emulsion was controlled to be 8.5 by using concentrated ammonia. After the reaction is over, continue to stir for half an hour and let stand for 24 hours. Use deionized water with a pH of 8.5 at 50°C and adjusted by ammonia as the cleaning solution. The e...

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Abstract

The invention belongs to the field of luminescent materials, and relates to an electron beam excited red phosphor. The chemical expression formula of the phosphor is (Sn1-a-bMaEub)O2, wherein a is more than 0 and less than 0.25, and b is more than 0 and less than 0.10; and M is one or more of Sb, Al, Zn and In. A preparation method of the red phosphor comprises the following steps: preparing a cation hydroxide precursor through adopting an alkaline solution precipitation technology, calcining the precursor in atmosphere, and post-processing the calcined precursor to obtain the red phosphor. The red phosphor can be effectively excited under the irradiation of electron beams, and has the advantages of high brightness, good color, low turn-on voltage, smooth phosphor particles, uniform granularity distribution, simple preparation method, low production cost, and realization of large-batch production, is mainly used in color field emission displays, and also can be used in other electron beam excited displaying and illuminating devices.

Description

Technical field [0001] The invention relates to a red phosphor, in particular to a red phosphor excited by an electron beam, belonging to the field of luminescent materials. Background technique [0002] The color field emission display (FED) combines the high image quality of the cathode ray tube (CRT), the ultra-thin type of the liquid crystal display (LCD) and the large area of ​​the plasma display (PDP), and is known as the "king of the future" ", and can be used as a new type of LCD backlight or planar lighting source. The key to preparing high-quality FEDs is the design and preparation of field emission arrays, and the fluorescent materials. High-performance phosphors are critical to improving the brightness, color, and lifespan of FED. [0003] Compared with CRT, FED is also an electron beam excited luminescence (CL) device, but FED has a low working voltage and large current, which makes FED phosphors and CRT phosphors have a big difference. [0004] At present, traditiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78C09K11/80
CPCC09K11/7742
Inventor 朱宪忠李豆赵春宝孙士祥周志近
Owner 合肥名龙电子科技有限公司
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