EPSRC CDT in Metamaterials: Organic light emitting devices with plasmonic and GraphExeter enhanced efficiency

University of Exeter - Departments of Physics and Astronomy, and Department of Engineering

The studentship is part of the EPSRC Centre of Doctoral Training in Metamaterials (XM2), www.exeter.ac.uk/metamaterials.  Our aim is to undertake world-leading research, while training scientists and engineers with the relevant research skills and knowledge, and professional attributes for industry and academia.

Joint supervisors:  Prof Monica CraciunProf Saverio Russo

Organic light-emitting devices (OLEDs) are becoming increasingly important in the fast-growing fields of flexible displays, solid-state lighting, wearable displays, biomedical devices and health-monitoring technology. While the internal quantum efficiency of OLEDs has been demonstrated to be 100%, their external quantum efficiency is still relatively low with a record of only 30%. This is due to various factors such as poor work function matching between electrodes and photoactive layer, high sheet resistance of the electrodes, device degradation due to diffusion of indium from the Indium Tin Oxide electrodes, and the out-coupling efficiency.

The aim of this project is to realize highly efficient OLEDs by incorporating plasmonic nanostructures to increase the out-coupling efficiency and GraphExeter electrodes. Graphexeter is a novel graphene composite material discovered by the supervisors groups that combines the transparency, flexibility and lightweight properties of graphene with an electrical and thermal conductivity rivalling that of metals. This material has extraordinary low sheet resistance, work function matched to the one of the organic photoactive layers and we have recently demonstrated that embedding this material as a transparent electrode in electroluminescent devices increases the brightness of the emitted light by 50% compared to state-of-the-art electrodes.

4-year studentship: for UK/EU students, the studentship includes tuition fees and an annual stipend equivalent to current Research Council rates; for international students (non-EU) a very small number of fees only studentships may be available

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