Preparation method of flaky aluminate green phosphor

Abstract

The invention relates to a preparation method of a flaky aluminate green phosphor. The preparation method comprises the following steps: 1, respectively weighing corresponding raw materials according to the amount of an object product to be prepared and the stoichiometric ratio of all metal elements in Ce1-xTbxMgAl11O19, and preparing a mixed nitrate solution of metals contained in the object product; 2, adding an organic fuel to the mixed nitrate solution obtained in step 1, and heating to dissolve; 3, adding ammonium fluoride to the mixed solution obtained in step 2, heating to dissolve, and continuously concentrating the mixed solution until that the mixed solution is in an approximately sticky state; 4, initiating the sticky solution obtained in step 3 to be subjected to self-propagating combustion; 5, post-treating self-propagating combusted products obtained in step 4; and 6, washing, drying, grinding, and sieving the product obtained in step 5 to obtain the object product. The preparation method of the invention, which has the advantages of phase forming temperature reduction, calcining time shortening, excellent luminescent performance, controllable particle size, uniform size, regular morphology, simple enforcement, low cost, rapidness, and energy saving, has a good industrialization application prospect.

Description

technical field [0001] The invention belongs to the technical field of material preparation, in particular to a preparation method of a rare earth luminescent material. technical background [0002] Rare earth tricolor phosphor green powder doped with Tb 4+ Phosphates, borates, aluminates, etc., among them, Ce 1-x Tb x MgAl 11 o 19 Aluminate phosphor (CMAT for short) has high temperature resistance and good stability, so that other phosphors cannot be replaced now, and it can also be used in new PDP flat panel displays. The industrial preparation method is still the high-temperature solid-phase method, and other methods such as the sol-gel method and the hydrothermal method still have no industrial application prospects, while the high-temperature solid-phase method has a high calcination temperature (above 1500 ° C), a long time, and uses It takes a long time to mix the raw materials and co-solvents evenly, and the product particles are coarse and irregular in shape. I...

AI Technical Summary

Problems solved by technology

The industrial preparation method is still the high-temperature solid-phase method, and other methods such as the sol-gel method and the hydrothermal method still have no industrial application prospects, while the high-temperature solid-phase method has a high calcination temperature (above 1500 ° C), a long time, and uses It takes a long time to mix the raw materials and co-solvent evenly, and the product particles are coarse and irregular in shape. It takes a long time for ball milling to meet the requirements of use. It is a synthetic method with high energy consumption, long cycle time and is not environmentally friendly.

[0003] The study of new methods for the preparation of phosphors with physical properties control has always been a research hotspot in the field of luminescent materials, because the particle size, morphology and crystallinity of phosphors have a crucial impact on their luminescent properties. High-temperature solid-phase synthesis of CMAT often adds co-solvent salts through solid-solid phase mixing to promote phase formation. Due to uneven mixing, the effect is not ideal, and high temperature and long-term calcination is still required.

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