We present detailed experimental and theoretical analysis for both constant-wave and pulsed excitation for a variety of real bilayer organic light-emitting diodes (LEDs). We find from experiment and simulation that the recombination zone may be moved about the polymer-polymer heterojunction as a function of the applied voltage. We suggest a method for spectrally resolving the emission of both polymers of a bilayer LED as a function of time, and show that these results are in good agreement with time-dependent simulation results. The simulation model takes into account both the discontinuities in energy levels and mobilities across the polymer-polymer heterojunction.
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Pinner et al. (2004) studied this question.
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