Emissive processes in organic light emitting diode materials
Project members
Supervisor: Dr Paul Shaw, COPE
Abstract: Organic semiconductors can be highly luminescent and there currently exists a broad palette of materials available for use in both display and lighting applications. These applications are currently the two biggest emerging markets for organic semiconductors and both require high efficiency devices that can consistently deliver high brightness. The performance of early materials was fundamentally limited by the fact that only singlet excitons contributed towards the electroluminescence. This limitation has been overcome through the development of innovative materials where the triplet exciton is able to contribute towards the emission. However, the processes that lead to emission are not fully understood nor are the interactions between the different excited state species.
This project will employ time-resolved photoluminescence (TRPL) to explore the physics of light generation in novel materials for organic light emitting diodes. You will work on the development of a TRPL system for measuring the emission on microsecond-millisecond timescales. You will use TRPL to understand the nature of the emissive process (phosphorescence, thermally activated delayed fluorescence) in a diverse range of emissive materials and the interplay between the different excited state species. The outcomes from this project will guide the development of more efficient material and device solutions.