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首页> 外文会议>Appita annual conference and exhibition; 20090419-22; Melbourne(AU) >Colour tuneable photoluminescent quantum dots for ink-jet printing of security documents and labels
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Colour tuneable photoluminescent quantum dots for ink-jet printing of security documents and labels

机译：颜色可调光致发光量子点，用于安全文件和标签的喷墨打印

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摘要

The use of photoluminescent doped zinc sulfide (ZnS) quantum dots (semi-conductor nanoparticles with a particle size less than the Bohr radius) in an ink-jet formulation, offers the exciting opportunity for the digital printing of characters and images which are invisible in ambient light but are visible in different colours when viewed under UV light. The colour depends on the nature and level of dopant metal ion contained in the host ZnS lattice. ZnS doped with Mn~(2+) ions exhibit a red-orange colour (600 nm) and when doped with Cu~(2+) ions they exhibit a blue-green colour (530 nm) under UV light. In ambient light they are invisible. Other colours are possible with different dopants and host lattices. The stabilised doped ZnS quantum dot colloids have been formulated for ink-jet printing and various images were printed on paper substrates using a 2811 Dimatix Materials printer. After printing, no image was visible under ambient light and the substrate appears blank. However, under UV light, photoluminescent images are visible with the colour being determined by the nature and level of the dopant ion. This new technology opens up significant potential applications for the ink-jet printing of security documents and labels in single colour and full colour characters and images, and also in novel flexible photoluminescent displays and advertising.
机译：在喷墨配方中使用光致发光掺杂的硫化锌（ZnS）量子点（粒径小于玻尔半径的半导体纳米粒子）为数字印刷字符和图像提供了令人兴奋的机会，环境光，但是在紫外光下可以看到不同的颜色。颜色取决于主体ZnS晶格中包含的掺杂金属离子的性质和含量。掺杂Mn〜（2+）离子的ZnS呈现红橙色（600 nm），掺杂Cu〜（2+）离子时在紫外光下呈现蓝绿色（530 nm）。在环境光下它们是不可见的。具有不同掺杂剂和主体晶格的其他颜色也是可能的。稳定的掺杂ZnS量子点胶体已配制用于喷墨打印，并使用2811 Dimatix Materials打印机将各种图像打印在纸质基材上。打印后，在环境光下看不到任何图像，并且基材显示为空白。然而，在紫外光下，可见光致发光图像，其颜色由掺杂离子的性质和水平决定。这项新技术为单色和全彩色字符和图像的安全文档和标签的喷墨打印以及新颖的柔性光致发光显示器和广告的喷墨打印带来了巨大的潜在应用。

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