| 摘要 |
PURPOSE: An invisible luminescence material and a manufacturing method thereof are provided to use commercialized ultraviolet-ray LED as light source and enable to use a silicon based detector at low cost, thereby using for special print for forgery prevention. CONSTITUTION: A manufacturing method of an invisible luminescence material is composed of following chemical formula: Ba_(1-x)SnA_xO_3. The manufacturing method of an invisible luminescence material comprises the following steps: a step of mixing barium compound, stannic compound, and alkali metal salt compound; a step of plasticizing the mixture in the air; and a step of pulverizing the mixture after cooling the mixture to room temperature. In the chemical formula, 0<x<0.4,and A indicates alkali metal. The barium compound is one or more selected from barium carbonate(BaCO3), barium sulfate(BaSO4), and barium chloride(BaCl2). |
