We report results of emission measurements from aluminium tris-8-hydroxyquinoline (Alq3) based devices to demonstrate that introducing nanostructure into organic light emitting diodes allows previously trapped modes within the device to be scattered out as far-field radiation. This significantly alters the angular emission pattern and polarization characteristics of the device, and may result in improved device efficiency. The various radiative and non-radiative emission paths have been calculated and used to identify the different modes observed in the emission.
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