Preparation method of blue long-afterglow luminescent powder

Abstract

The invention relates to a preparation method of blue long-afterglow luminescent powder. The preparation method comprises the following steps of: uniformly mixing zinc sulfide, germanium chloride, a silver nitrate solution, bismuth oxide, sulfur, a samarium nitrate solution, a potassium iodide solution and magnesium chloride to obtain a mixture; heating the mixture at 900-1150 DEG C, and cooling to 500-600 DEG C to obtain a block; sorting out non-luminance substances, soaking the non-luminance substances with ammonia water statically, washing the soaked non-luminance substances with water, and drying the non-luminance substances in a drying oven; and screening dried powder with a sieve to obtain the blue long-afterglow zinc sulfide luminescent powder, wherein the particle size of the sieve can be selected according to the particle size of the powder. The obtained luminescent powder is not limited by an excitation light source, high in light absorption speed, capable of being saturated after being irradiated for 5 minutes, long in afterglow time, high in initial brightness, uniform in particle, low in production cost, good in water resistance, insoluble in water, nontoxic and free of radioactivity; and the prepared blue long-afterglow luminescent powder and other two kinds of ZnS series luminescent powders ZnS: Cu (green) and ZnSTi: Eu, Mn, In (red) form tri-primary-color luminescent powder and can be blended into various required colors, and therefore the blue long-afterglow luminescent powder can be applied more widely.

Description

technical field [0001] The invention relates to a preparation method of luminescent powder, in particular to a preparation method of blue long afterglow luminescent powder, which belongs to the field of luminescent powder preparation. Background technique [0002] Luminescent powder, also known as luminescent powder, is a long afterglow luminescent material, referred to as long afterglow material storage powder, also known as luminous material luminescent material. This type of material has structural defects or impurity defects in the crystal lattice formed during the synthesis process and has luminescence properties. The luminescence caused by material lattice defects is called self-excited luminescence, and the luminescence caused by impurity defects is called activated luminescence. [0003] Blue long-lasting luminescent powder is a basic color of the three primary color luminescent powders. At present, there are many manufacturing methods for blue long-lasting luminesce...

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Problems solved by technology

[0003] Blue long-lasting luminescent powder is a basic color of the three primary color luminescent powders. At present, there are many manufacturing methods for blue long-lasting luminescent powder. At present, an important blue luminescent powder in China is doping rare earth in aluminate Ions (Sr 4 Al 14 o 25 : Eu, Dy), this kind of blue luminescent powder has the advantages of high brightness and long afterglow time, but this kind of luminescent powder is easy to decompose and fail when it encounters water, and it is easy to rub and turn black when it is added to other materials. Fatal defects of iron blackening failure and long light absorption time

At the same time, because there is no red luminescent powder with the same brightness and afterglow (the brightness is about 230 in 5 minutes, and the afterglow is 1000 minutes), it is impossible to form three primary toners, which limits its application.

In addition, other blue luminescent powders include ZnS: Cu, I (a mixture of ZnS and Cu and I), SrS: Cu, Bi (a mixture of SrS, Cu and Bi), CaS: Cu, Rb, CaS: Bi , CaS:Pr, etc., but because of its poor chemical stability and short afterglow time, generally 30 to 150 minutes, it cannot be widely used due to the limitation of excitation light source and other factors.

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