Fast synthesizing process of strontium aluminate rare earth long afterglow luminescent powder

Abstract

The fast synthesis process of long afterglow RE strontium aluminate powder includes mixing aluminum nitrate, strontium nitrate, boric acid and composite RE activator; and microwave heating the mixture inside one sandwiched container with carbon black or other microwave absorbing material filled in the sandwich at 1000-1700 deg.c to react for 10-60 min. The composite RE activator consists of nitrates of Eu, Dy, Nd and / or La. The product of the long afterglow RE strontium aluminate powder is monoclinic crystal in the nanometer size.

Description

1. Technical field: [0001] The invention relates to a preparation method of an inorganic luminescent material, in particular to a preparation method of a strontium aluminate matrix luminescent material, specifically a rapid synthesis method of a strontium aluminate rare earth long-lasting luminescent powder. 2. Background technology: [0002] Strontium aluminate rare earth long afterglow luminescent powder is a new type of environmental protection and energy-saving material. After absorbing the energy of sunlight or light, it stores part of the energy, and then slowly releases the stored energy in the form of visible light. It can still emit visible light for a long time. Utilizing this feature, it can be used as night markings for emergency exits of buildings, dangerous areas, evacuation passages and important parts of factories, as well as concealed lighting and night indicating lighting for dashboards of fighter jets and simple night sighting of guns. In addition, it als...

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Problems solved by technology

The preparation technology of the high-temperature solid-phase method is relatively mature, but the synthesis temperature is high, the time is long, and the obtained product has high hardness and coarse grains. The salts are weighed and finely ground according to the proportion of the components, heated in a high-temperature furnace at 1200°C-1600°C for 1-6 hours, and then cooled in a N furnace at 1000°C-1400°C 2 +H 2 Burning in the atmosphere for 1-4 hours; the particle size of the product produced by the sol-gel method is small and uniform, but its production cycle is long, the price of raw materials is relatively expensive, and the alkoxide has harmful effects on the human body, which is not conducive to large-scale industrial production. CN1197831A is to add water to the organic compound raw material and keep it at 30°C-85°C for 48-50 hours to form a sol, then put it in a vacuum drying oven to dry for 24 hours, sinter in the air for 2 hours, and finally burn at a high temperature in a reducing atmosphere for 0.5 -3 hours; and the luminous intensity and brightness of the product prepared by the combustion method are relatively poor; the hydrothermal synthesis method must be carried out in a high-pressure environment in an autoclave, so the production cost is high, and the brightness of the product obtained by this method is low

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