ABSTRACT

This chapter discusses organic light emitting devices (OLEDs) in detail, and gives a list of common organic semiconductors that have played an important role in the development of the field. It presents a compilation of a few examples of organic semiconductors and dyes that have played an important role in the development of OLEDs. The molecular nature of organic semiconductors leads to a number of significant physical differences between organic and inorganic semiconductors. The chapter also summarizes the most important differences. It is essential to control the bandgap of the emissive semiconductors in a display to reproduce the full color gamut. It is one of the key assets of organic semiconductors that their bandgap can be controlled systematically via modification of their chemical structure. Chemical bandgap tuning can be classified roughly into three types: steric, electronic via sidechain variation and electronic via copolymerization.