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The field of materials science has produced a variety of valuable products and technologies defining modern day civilization. While still dominated by inorganic materials, the field of organic electronics opens new technological opportunities and the access to a new class of complementary materials. Being carbon based, organic electronic materials are abundant and environment friendly, often made with low temperature processing compatible with existing inorganic materials, and highly tunable for specific optical and electronic properties. These properties have helped enable the use of organic electronic materials throughout a wide range of products. Some of these include organic light emitting diodes (OLEDs) for electronic displays and lighting, organic field effect transistors (OFETs) for device control and computing, and organic photovoltaics (OPVs) for energy generation among other uses. With their wide range of uses, the study of organic electronic materials is of high importance.In this work, we examine both highly studied and relatively new low-dimensional materials. Since their discovery in 1991, single-walled carbon nanotubes (SWNTs) have seen much interest due to their unique electronic and optical properties. Here we design all-SWNT electrochromic devices capable of modulating incoming light with fast response times (few milliseconds). The mechanism behind the device is explored through the view of an electric double layer capacitor (EDLC) and reveals important clues for the design of fast electrochromic devices.Also explored here is the substitutional doping of phenalenyl based radical molecular conductors. Through the use of substitutional doping most commonly used in silicon-based semiconductors, we demonstrate the enhancement of the electrical conductivity of some molecular conductors and modification of their magnetic properties. We also explored the possibility of using the substitutional doping to control a hysteretic phase transition and related bistable state in another phenalenyl based radical molecular conductor. Finally, the phenalenyl based radicals are incorporated into an electrochromic device which is able to modulate both visible and short-wave infrared light thus opening a novel pathway for development of a new class electrochromic materials for smart window applications.