Graphene quantum dot (GQD) light-emitting diodes (GQD-LEDs) are shown to have an electroluminescence exceeding 1000 cd m-2. These devices are possible due to a novel synthesis method to create GQDs with minimal oxidation, guaranteeing high quantum yields via the solvothermal formation of graphite intercalation compounds between graphite powder and sodium potassium tartrate. The GQDs are incorporated into polymeric host layers in a multilayer device and irradiate blue (~400 nm) emission.
Song, Sung Ho, Min-Ho Jang, Jin Chung, Sung Hawn Jin, Bo Hyun Kim, Seung-Hyun Hur, Seunghyup Yoo, Yong-Hoon Cho, Seokwoo Jeon
Advanced Optical Materials