Preparation of red strontium sulphide long afterglow material

Abstract

The invention discloses a method for preparing a red strontium sulphide long afterglow material, comprising a hydrothermal coprecipitation method which comprises the following steps that: (a) water-solubility strontium salt, water-solubility europium salt, water-solubility dysprosium salt, carbamide and water are weight according to the mol ratio of 1: between 0.01 and 0.05: between 0.01 and 0.05: between 4 and 6: between 28 and 32 and are put inside a container to be stirred and dissolved, the mixture is insulated in a sealing state at a temperature of between 80 and 160 DEG C for 5 to 24 hours so that a precursor is obtained; (b) the precursor is subject to filtering and annealing at a temperature of between 900 and 1200 DEG C in the reaction environment for 0. 5 to 2 hours so that the red strontium sulphide long afterglow material is prepared; the water-solubility strontium salt is strontium nitrate or strontium chloride or strontium acetate, the water-solubility europium salt is europium nitrate, europium chloride or polyimide, the water-solubility dysprosium salt is dysprosium nitrate or dysprosium chloride or dysprosium acetate, and a surface active agent is added according to the mol ratio of the water-solubility strontium salt to the surface active agent of 1: between 0.0001 and 0.0003. The method is widely applied to the fields such as building decoration, traffic transportation, military facilities, fire emergency service and goods for everyday consumption.

Description

technical field [0001] The present invention relates to a kind of preparation method of long afterglow material, especially a kind of red strontium sulfide (SrS:Eu 2+ , Dy 3+ ) preparation method of long afterglow material. Background technique [0002] The long afterglow luminous body activated by rare earth elements such as europium is a new generation of photoluminescent materials. Because of its energy saving, corrosion resistance and non-radioactive characteristics, it is widely used in building decoration, transportation, military facilities, fire emergency, and daily consumer goods. and other fields have shown broad application prospects. Among them, red strontium sulfide (SrS:Eu) can emit a striking red afterglow in the dark 2+ , Dy 3+ ) long afterglow material has practical application value especially, for this reason, people have made unremitting efforts in order to obtain it, as a kind of " long afterglow" disclosed in CN 1298434A published on June 6, 2001. ...

AI Technical Summary

Problems solved by technology

However, this preparation method has disadvantages. First, there are a large number of grain boundaries in the strontium sulfide phosphor produced by this method, which will seriously weaken the afterglow performance and make its afterglow time short; secondly, the The intermediate suspension is only a simple physical mixing of various raw materials, and does not achieve uniform mixing at the atomic molecular weight level, which is not conducive to significantly improving the afterglow performance of the material

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