Blue luminophore for plasma fluorescent screen and its preparation method

Abstract

The present invention belongs to an innovation of flat panel display technology, and relates to a preparation method of blue fluorescence body for plasma screen. On the basis of conventional BaMgAl10O17:Eu+2 the scandium ion and gallium ion (Sc+3+Ga+3) are doped, and its chemical composition formula is Ba1-xEuxMgAl10-y-zScyGa2 O17, where X=0.01-0.2, Y=0.005-0.3 and Z=0.001-0.25. Under the discharge wavelength lambda-147 nm vacuum UV light excitation the light-emitting luminance of said invented fluorescence body is raised by 10-12%, and can be up to 400 candela / sq.m.

Description

technical field [0001] The invention belongs to the technology of blue fluorescent body for flat panel display, and specifically refers to a preparation method of the fluorescent body for plasma fluorescent screen. Background technique [0002] As is well known, plasma phosphor screens driven by direct current and alternating current have been widely used. This plasma phosphor screen is used to reproduce a large amount of full-color information. These information can usually be clearly observed within a distance of 2 to 20 meters. In the plasma fluorescent screen, it is filled with inert mixed gas such as xenon (Xe) and neon (Ne). This inert gas generates discharge under the excitation of high-frequency electric field, and emits vacuum ultraviolet light with a value of λmax=147nm-171nm. Under the excitation of the vacuum ultraviolet light, the red, blue and green phosphor layers coated on the inner surface of the plasma fluorescent screen with a thickness of about 0.2-0.6 ...

AI Technical Summary

Problems solved by technology

[0004] 1. Because the chromaticity coordinates X=0.12, Y=0.09-0.11, can not meet the requirements, and deviate from the color circle value required by the RGB three-color coordinates of the plasma fluorescent screen;

[0005] 2. Since the maximum emission peak of the phosphor is within the range of λmax=415nm-430nm, the luminous brightness is insufficient

[0007] The phosphor has low water resistance and is unstable and easy to hydrolyze in the chemical medium containing water;

[0008] Due to the poor chemical stability of the phosphor, the brightness decreases during the screen making process;

[0009] The display screen made of this phosphor has low anti-excitation performance during use

[0010] Although this phosphor has been continuously improved, the above-mentioned problems have not been solved stably.