Organic electroluminescent diodes based on thin organic layers are one of the most promising next-generation systems for the backlighting of liquid crystal screens. In the literature, conduction has been interpreted in terms of tunneling or as a space charge limited process. To clarify this point we carried out an experimental study of the electrical and optical characteristics, as a function of the applied voltage, for different hydrostatic pressures. Results show that tunneling is the dominant mechanism which controls the organic light emitting diodes efficiency.
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Destruel et al. (1999) studied this question.
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