| 摘要 |
PURPOSE: A manufacturing method of invisible luminescence material with improved luminous intensity in wavelength of 290 nm is provided to increase luminous intensity of SrB4O7:Ag^+ phosphors of 290 nm wavelength which is in invisible region, thereby suitable as phosphors for preventing falsification. CONSTITUTION: A manufacturing method of invisible luminescence material in chemical formula: Sr_(1-x-y)B_4O_7:Ag^+_x,Gd^(3+)_y comprises a step of mixing a strontium compound, boric acid(H3BO3), monovalent silver compound, and gadolinium compound; a step of plasticizing the mixture under atmosphere; and a step of pulverizing the product by cooling the mixture to room temperature. In chemical formula, 0<x<1, 0<y<1 and 0<x+y<1. The strontium compound is one or more selected from strontium carbonate(SrCO3), strontium chloride(SrCl2) and strontium nitrate(Sr(NO3)2).
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