TreeHugger has a post on using graphene for energy efficient lighting - Move Over OLEDs: Scientists Create Cheap, Fully Recyclable Lighting Material.
Swedish and American researchers have just developed a fully recyclable lighting component with what Science Daily is terms a "new super material": graphene. Graphene is both inexpensive to produce and is 100% recyclable, and could be used to create glowing wallpaper made out of plastic--much like )LEDs could. But graphene appears to improve on OLEDs in some very big ways . . .
As you know, we've been big fans of the very efficient, long-lasting Light Emitting Diodes and Organic LED technology. But as Science Daily notes, there are still problems:Today's OLEDs have two drawbacks -- they are relatively expensive to produce, and the transparent electrode consists of the metal alloy indium tin oxide. The latter presents a problem because indium is both rare and expensive and moreover is complicated to recycle.
Researchers believe they've found a solution by creating an organic light-emitting electrochemical cell (LEC) with the transparent electrode made of the "carbon material graphene." Graphene is used instead of conventional metal electrodes--and since everything in an LEC, including the graphene, can be created from liquid solutions, they will be able to be produced through a printing process. This makes them much more efficient--and much less expensive--to create en masse than OLEDs. Researchers involved in the project say that graphene paves the way for cheap production of plastic-based lighting, perhaps for the first time.