A comparison of the electrical properties of polymer LEDs based on poly(thiophene)s and PPV-derivatives

This thesis describes the electrical properties of conjugated polymer LEDs. It is important to understand these electrical properties in detail for optimisation of the efficiency of the LEDs (the ratio between the amount of photons generated and the amount of charge carriers injected into the structure). It is very well known that proper alignment of the Ferrni-level position of the metallic electrodes to the molecular transport levels of the organic semiconductor enhances the efficiency considerably. This however is only the case if the electrical properties of the device are dominated by charge carrier injection from the contacts. This thesis shows that not all conjugated polymers could be optimised by reducing interfacial barrier heights, but that for some materials bulk electrical properties of the material are dominant. The single-layer and multi-layer device properties of several conjugated polymers [poly(thiophene)s and PPV-derivatives] are compared and this shows that the background concentration of charged species left from the synthesis procedure determines how dominant the bulk properties are in comparison to the contact properties.

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