Field Induced Polymer Electroluminescent Lamps - FIPELs

D.L. Carroll
Wake Forest University, US

Keywords: FIPEL, organic lighting device

Summary:

In this work we present a novel and new approach to organic lighting devices. The AC driven field induced polymer electroluminescent device (FIPEL) is constructed by placing an organic emitter between two capacitor plates with an intervening high k, dielectric. The performance of such devices are sensitive to driving voltages and frequencies with the primary mechanism for exciton creation being the polarization current generated within the emitter. By using charge generations layers with a white emitter, and polymer ferroelectric insulating layers (such as PVDF and its copolymers), an impedance matched device can exceed 13,000 Cd/m2 with over 34 LPW (without output coupling). Surprisingly, as luminance increases in FIPEL devices, so too does the efficiency - in contrast to typical OLEDs. In this presentation we will discuss strategies to increase the overall efficiency of such devices together with our latest results on large area displays and lighting. Specifically, the lack of directly injected current results in greater dimensional tolerance and fewer interfacial failures. This points to the possibility of such devices having commercial relevance.