Peter SkabaraHIND SALAH ALDHUWAIHI2022-06-042022-03-152022-06-04110476https://drepo.sdl.edu.sa/handle/20.500.14154/66175Organic light emitting diodes (OLEDs) have become increasingly popular since the first OLED cell was built in 1987. To improve their efficiency, a specific class of organic materials that exhibits thermally activated delayed fluorescence (TADF) is implemented. In order to optimise the TADF process, a great deal of research has been done to design and synthesise TADF emitters with specific photophysical properties. In addition, some research has been done to develop host materials that can optimise the emitter properties and improve overall device performance. In this article, high-performing host materials for the green emitter 4CzIPN are explored. The photophysical properties of the organic materials, as well as their performance within an OLED device, is analysed and correlated with their molecular structures.39enThesis