More than two decades have already elapsed since research into organic electronic devices was begun. Taking their electro-conductivity into account these devices were initially expected to have the potential of functioning as substitutes for metallic devices. However, the early research program was later expanded to search for other applications such as is in their use in light-emitting devices that convert electric power into light. These devices are usually called organic EL (electroluminescence) devices. The organic EL device is a kind of light-emitting diode and the process of thus fabricating a diode leads to the possibility of producing transistors as well as to organic memories for storing data. The current level of research into organic semiconductors is so advanced that it is now possible to fabricate a piece of electronic equipment using only organic substances.
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