Electron beam excited red phosphor and preparation method thereof

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...

AI Technical Summary

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

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