ABSTRACT
The electroluminescence (EL) phenomenon was first discovered in a piece of carborundum crystal, by H. J. Round in 1907. In early attempts to develop organic EL devices, the driving voltage of such devices was on the order of 100 V or above to achieve a significant light output. This chapter provides a brief review of conjugated polymers in semiconducting phase and metallic phase is given. The fundamental difference between saturated polymers and conjugated polymers is their electronic configuration. The chapter discusses device architectures and their corresponding processes. It describes some novel devices and novel functions in thin-film polymer devices. The chapter also provides information on the technical merits of small-molecule organic light emitting diodes/polymer light emitting diodes for use as emitter elements in flat-panel displays.
