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1. General
1.1 Definition
A material is said to be electroluminescent when an electric current passes through it, emitting light in a non-thermal way.
The phenomena involved in organic electroluminescence are complex and still incompletely understood. Nevertheless, it is now accepted that the following four stages occur successively (figure 4 ):
injection of electrons and holes from the cathode and anode respectively;
charge transport in the material in the form of charged species called polarons (p + ...
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