Organic Light-Emitting Diode: a display device invented by Eastman Kodak in the early 1980s. OLEDs sandwich carbon-based films between two charged electrodes, one a metallic cathode and one a transparent anode. The organic films consist of a hole-injection layer, a hole-transport layer, an emissive layer and an electron-transport layer. When voltage is applied to the OLED cell, the injected positive and negative charges recombine in the emissive layer and create electro luminescent light.
