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Analysis of trap-induced noise in organic light-emitting diodes based on the master equation

The effect of traps on noise spectra in organic light-emitting diodes is investigated via a Langevin approach under steady-state conditions based on a three-dimensional bipolar master equation model. A Gaussian-type density of states is attributed to both trapped and free charge carriers. The relative power spectral density of the terminal current in the space-charge-limited-current regime is increased by a high fluctuation in the number of trapped charge carrier, which is weakened by the emergence of the field-induced detrapping.