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Rare-earth material lights up with a message when stretched
newscientist  2018.07.12



A MATERIAL that lights up when stretched or put under ultraviolet light could make bank notes harder to counterfeit.

Mechanoluminescent materials light up when they are rubbed, bent or stretched. Songshan Zeng at the University of Connecticut and his colleagues made a new one using rare earth elements. The researchers then combined their material with one that is see-through in normal daylight, but glows in UV light. They were able to make a material that lights up red when stretched, green when under UV and yellow when both happen at once.
 
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