Preparation method of ultraviolet-excited red-light fluorescent powder for counterfeiting prevention

Abstract

The invention discloses a preparation method of ultraviolet-excited red fluorescent powder for counterfeiting prevention. The method comprises the following raw materials in parts: 60-70 parts of water, 10-18 parts of calcium salt, 20-25 parts of titanium oxide, 15-26 parts of europium oxide, 20-35 parts of barium sulfate, 20-30 parts of magnesium sulfate, 1-5 parts of lithium phosphate, 1-5 parts of copper nitrate, 2-4 parts of activator, 4-8 parts of catalyst, 1-3 parts of precipitator and 2-6 parts of complexing agent. The activator is prepared by mixing propane diamine phosphate, ammonium sulfate, ammonium chloride and ammonium hydroxide according to the ratio of (3-6): (2-8): (4-6). The activator, the catalyst, the precipitator and the complexing agent are added in an existing preparation method, so that the prepared fluorescent powder is short in illumination but long in lighting effect, the preparation method is simple, the cost is low, the color is gorgeous; meanwhile, when a shielding object is placed at the position where the fluorescent powder is used, the shielded position becomes black, after the shielding object is taken off, the fluorescent powder can be recovered automatically, the fluorescent powder can be displayed by using other light, and the fluorescent powder can be used for instant anti-counterfeiting.

Description

technical field [0001] The invention relates to the technical field of fluorescent powder, in particular to a method for preparing an ultraviolet-excited red fluorescent powder for anti-counterfeiting. Background technique [0002] Phosphor powder, commonly known as luminous powder, is usually divided into two types: photo-induced energy storage luminous powder and radioactive luminous powder. Photo-energy storage luminous powder is a fluorescent powder that stores light energy after being irradiated by natural light, daylight, ultraviolet light, etc., and then slowly releases it in the form of fluorescence after stopping the light irradiation, so it can be used at night or in dark places. , can still see the luminescence, which lasts for several hours to more than ten hours. [0003] However, the phosphor powder prepared by the preparation method in the prior art has low intensity, not bright enough color and single function, and does not have the function of anti-counterf...

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Problems solved by technology

[0003] However, the phosphor powder prepared by the preparation method in the prior art has low intensity, insufficient color and single function, and does not have the function of anti-counterfeiting. Therefore, we propose a method for preparing an ultraviolet-excited red phosphor for anti-counterfeiting

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