Method for preparing manganese-doped zinc silicate green luminescent powder by low temperature solid state reaction

Abstract

The invention provides a method for preparing manganese-doped zinc silicate green luminescent powder by low temperature solid state reaction by using meso-porous silicon oxide, zinc salts and divalent manganese salts as raw material, dispersing the meso-porous silicon oxide into the alcoholic solution of zinc salts and divalent manganese salts, drying and sintering at 750-950 deg. C with the protection oif neutral gas.

Description

technical field [0001] The present invention is about a kind of zinc mangible mangible mangible siliconate (ZN 2 SiO 4 : Mn) a novel method of green fluorescent powder, which can be used for color plasma display panels, cathode ray tubes, fluorescent lamps, and medical X-ray radiation detectors. Background technique [0002] In the past ten years, ordered mesoporous materials have been widely used in catalysis, adsorption, host-guest assembly, low-dimensional The characteristics of nanomaterials, preparation of optical and electronic components, and sustained release of drugs have quickly become a research hotspot in the field of materials science, and have attracted extensive attention in other scientific fields such as physics, chemistry, medicine, and biology. On the other hand, among the known fluorescent materials, zinc manganese siliconate (Zn 2 SiO 4 :Mn) has become a good green fluorescent material due to its high brightness, good color purity, high fluorescence ...

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Problems solved by technology

Such as hydrothermal method, sol-gel method, co-precipitation method and other low-temperature wet chemical methods have the advantages of low synthesis temperature, easy doping, and uniform particle size of phosphor powder, but the crystallinity of the prepared phosphor is not high, and low crystallinity The degree will directly affect the Zn 2 SiO 4 : The luminescent performance and chemical stability of Mn green phosphor, a small amount of residual Cl - Ions will also have a great impact on the final use performance of the phosphor, reduce the fluorescence brightness of the phosphor, the reaction is not complete, the stoichiometric ratio is poor, the yield is not high, and a lot of amorphous SiO remains 2 , so the low temperature wet chemical method cannot be regarded as a good method

Although the high-temperature atomization decomposition method also has the advantage of consistent phosphor particle size, the high-temperature spray process takes O 2 is the carrier gas flow, Mn 2+ The ions are easy to oxidize, the powder is not easy to collect, the preparation temperature is not low and the equipment requirements are high

[0004] The high-temperature solid-state reaction method has the advantages of high product crystallinity, simple and fast process, and easy mass production. It is also the most widely used and most common commercial Zn 2 SiO 4 : Mn green fluorescent powder method, but the preparation temperature of this method is high, about 1200 ° C or even higher, the prepared phosphor powder is prone to sintering, the particles are agglomerated and grow up, and subsequent processing such as crushing, ball milling and grinding is required before application , these processes will destroy the surface state of the phosphor, and the particle size and the surface state of the phosphor play a decisive role in the fluorescent performance of the phosphor. Both large particles and damaged surface state will lead to a significant decrease in its luminous intensity and fluorescence persistence. In addition, the raw materials are all mixed in solid form, it is not easy to achieve uniform doping of manganese ions in the zinc silicate matrix, but gather at the grain boundaries, which easily leads to concentration quenching

[0005] Therefore, there is still a lack of a low-temperature effective Zn 2 SiO 4 : Preparation method of Mn effect green fluorescent powder

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