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Title: Study of solution processable emissive materials for organic light emitting diodes
Author: Breig, Benjamin
ISNI:       0000 0004 8502 8167
Awarding Body: University of Strathclyde
Current Institution: University of Strathclyde
Date of Award: 2018
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Organic light emitting diodes have played a major role in the display industry in the last ten years. Today, they have found commercial applications in smartphones, televisions, cameras and much more. This recent commercialisation is mainly due to the large performance enhancement in luminance, efficiency and lifetime observed in the last decade. The development of new organic emitting materials is obviously a key part of this success. Consisting of polymers, oligomers or small molecules, these emitters usually follow a simple synthetic path and, thanks to a facile functionalisation, they can be easily adapted to the desired project. However, they constantly need improvement to reach their full potential as efficient, cheap and lightweight light sources. Being able to obtain good performing solution processed emissive materials would be a major step towards the achievement of these goals. Chapter I includes a brief introduction to the history of OLEDs and their development, followed by a summarised description of the theory of OLEDs. Chapter II studies the different factors that influence OLED performances. A wellknown PPV polymer is used during this study. The emissive layer is first optimised in a conventional architecture. Then a change of architecture allows the study of optimising the transport/blocking layers on the device performance. Chapters III introduce two novel series of materials for red and green emission. Both series are based on a benzothiadiazole core and fluorene arms. The fluorene arm length and the terminal groups are varied and the influence of these changes are studied. The knowledge acquired in the previous chapter is applied to characterise and optimise the different emissive materials. In chapter IV the hole mobility of each material is measured in order to have a better understanding of the inner mechanisms of the devices and a solution processed electron transport is proposed as a way to improve their devices performances.
Supervisor: Skabara, Peter Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral