磷光
墨水池
材料科学
双稳态
紫外线
紫外线
智能材料
光电子学
计算机科学
纳米技术
荧光
光学
复合材料
物理
作者
Akihiro Kishimura,Takashi Yamashita,Kentaro Yamaguchi,Takuzo Aida
出处
期刊:Nature Materials
[Springer Nature]
日期:2005-06-19
卷期号:4 (7): 546-549
被引量:564
摘要
Security inks have become of increasing importance. They are composed of invisible substances that provide printed images that are not able to be photocopied, and are readable only under special environments. Here we report a novel photoluminescent ink for rewritable media that dichroically emits phosphorescence due to a structural bistability of the self-assembled luminophor. Long-lasting images have been developed by using conventional thermal printers, which are readable only on exposure to ultraviolet light, and more importantly, are thermally erasable for rewriting. Although thermally rewritable printing media have already been developed using visible dyes and cholesteric liquid crystals, security inks that allow rewriting of invisible printed images are unprecedented. We realized this unique feature by the control of kinetic and thermodynamic processes that compete with one another in the self-assembly of the luminophor. This strategy can provide an important step towards the next-generation security technology for information handling.
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