A kind of red fluorescent powder excited by electron beam 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 fluorescent powder, in particular to a red fluorescent powder excited by an electron beam, and belongs 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" of the display. ", and can be used as a new type of LCD backlight or flat lighting source. The key to making high-quality FED is the design and preparation of the field emission array, and the second is the fluorescent material. High-performance phosphors are critical to improving the performance of FEDs such as brightness, color and lifetime. [0003] Compared with CRT, FED is also an electron beam excited luminescent (CL) device, but the working voltage of FED is low and the current is large, which makes ...

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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