防伪原料 (security materials)
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物理性质 (Compounds properties) |
一、 长短波荧光防伪粉
(Fluorescent security powders)
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激发光:长短波紫外光(254nm和365nm)
化合物:有机及其稀土络合物
荧光颜色:长波荧光红、黄、蓝、绿,短波绿
Excitation: Long wave UV or short wave UV light
Composition: Organic Eu or Tb
UV fluorescent colors: Red, yellow, green, blue under UV light
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| 二、 红外防伪粉 (Infra-red security powders) |
激发光:980 nm红外激光
化合物:无机稀土复合物
红外颜色:绿
Excitation: 980 nm laser light
Composition: Inorganic Tb
IR colors: green under 980nm light
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| 三、 热敏变色粉(Thermo-chromic powders) |
加热温度:0-65
化合物:碱金属和稀土复合物
颜色:红、黄、蓝、绿、黑
Excitation: heating at 5-70℃
Composition: Organic metals
Color changes: from red, yellow, green, blue, black to invisible when heating
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| 四、 日光激发变色粉 (Sun-light sensitive security powders) |
变色条件:太阳照射,或者紫外光激发
化合物:碱金属和稀土复合物
变化后颜色:紫、黄、蓝
Excitation: UV light or Sun light
Composition: Organic metals
Color changes: from invisible to purple, blue under sun light
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