Electronic displays that can be printed onto virtually any surface, including paper and fabric, are now a step closer, thanks to the creation of a light-emitting ink.rnA team at Dai Nippon Printing in Tokyo, Japan, has used a conventional screen-printing technique to deposit a thin layer of the ink, a luminescent gel, onto a surface. The gel consists of a ruthenium compound that emits a bright light when a voltage is applied to it, along with an electrolyte and silica nanoparticles.
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