The basic structure of an OLED device is shown below. Organic thin films typically less than 50 nm in thickness are formed between a negative electrode (cathode) and a positive electrode (anode). Applying a voltage across the device promotes current flow with the injection of positive and negative charges into the organic layers. Recombination of the charges in the emissive layer releases energy in the form of light. RDL develops the emitters material which functions as the light source.
