In an advance that could boost the efficiency of LED lighting by 50 percent and even pave the way for invisibility cloaking devices, a team of researchers has developed a new technique that peppers metallic nanoparticles into semiconductors.
https://www.sciencedaily.com/releases/2017/07/170719132232.htm
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It reminds me of an early use of lighting as camouflage...
https://en.wikipedia.org/wiki/Yehudi_lights
Nanotechnology offers many fascinating possibilities...
http://www.nanowerk.com/images/applications-of-nanoparticles.jpg
The thing about invisibility cloaks is to always remember where you leave them!