Thesis

Study of solution processable emissive materials for organic light emitting diodes

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Awarding institution
  • University of Strathclyde
Date of award
  • 2018
Thesis identifier
  • T15207
Person Identifier (Local)
  • 201586951
Qualification Level
Qualification Name
Department, School or Faculty
Abstract
  • 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.
Advisor / supervisor
  • Skabara, Peter
Resource Type
Note
  • Previously held under moratorium from 22 August 2019 until 22 August 2022.
DOI
Date Created
  • 2018
Former identifier
  • 9912719091102996
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