A group of scientists from Stanley Electric Corporation and several Japanese universities has reported a deep-ultraviolet (DUV) light emitting diode (LED) which incorporates graphene. Graphene features in the form of nanoneedle field electron emitters. The nanoneedles have tip radii on the order of 5nm. The active material of the LED is Aluminum gallium nitride (Al-GaN).
Al-GaN has been used before for DUV LEDs, however efficiency has remained low until now. The graphene enhanced LED has a power efficiency of 4%, with an optical output of 20mW, which is significant. The device is packaged into a hand-held device powered by simple AA batteries.
What remains unclear is how the graphene nanoneedles were fabricated, and what the production yield is. Stanley Electric is best known for providing automotive lighting equipment for Honda and Nissan.