Low Operating Voltage Bilayer Organic Light Emitting Diodes Using Electrochemically Synthesized and p-Doped Starburst-Polymer as Hole Transport Layer

Bilayer organic light emitting diodes based on electrochemically synthesized and p-doped PTPA hole transport layer have been investigated. When a thin p-doped PTPA layer is inserted between the anode (ITO) and Alq3, the operating voltage of the devices has been clearly decreased while the current density and luminance increased.