A model for exciton formation in organic electroluminescent devices

This work attempts to model an organic luminescent device taking into account the carrier transport and how it could affect recombination. The carrier distribution is considered to have a direct impact on the exciton formation rate. The field dependent mobility indirectly enters the model when the diffusion length is determined based on the carrier mobility. Because of the distributed nature of the model, it should be able to address any form of positional dependent properties within the device such as in the case when the device has been selectively doped with impurities. The model was applied to the ITO/CuPe/NPB/Alq/Mg system and it has been possible to address a number of observations not explained previously.