This thesis describes the synthesis and characterisation of novel flavin, imidazole and benzothiadiazole derivatives semiconductors with potential optoelectronic applications. The first chapter provides an introduction about organic optoelectronics and in particular about small molecule organic optoelectronic martials and their advantages and applications such as bulk heterojunction and Perovskite solar cells, nonlinear optic and hybrid light emitting diodes. Furthermore, the chapter includes an overview about flavin, imidazole and benzothiadiazole. Chapter two describes the successful synthesis and characterization a series of six diimidazole derivatives, these dyes gave promising results to be used as organic down-converting materials for solid states hybrid-LED to produce white light. The same chapter reports the synthesis and characterisation of two flavin derivatives, designed to be used also as a as organic down-converting materials for solid states hybrid-LED to produce white light. Chapter three, describes the synthesis and characterization of two novel imidazole derivatives. These two molecules were designed to be used as organic small molecules hole transport material for Perovskite solar cells. Chapter four, describes the synthesis of a bisflvin derivative are based on two isoalloxazine skeletons fused by a benzo unit. This compound prepared to be use as small molecule acceptors for bulk heterojunction solar cells. The same chapter also reports the synthesis and characterisation of double donor-acceptor systems, based on triphenylamine (TPA) as a donor and benzothiadiazole as acceptor linked ferrocene as π-conjunction unit. The aim is to use this compound as small molecule donor for bulk heterojunction solar cells. Finally, the last chapter describes the synthesis of three flavin derivatives, designed according to the donor-acceptor (D – A) geometry, to be used as organic small materials for non-linear optic second harmonic generation. Two of the compounds exhibit higher thermal stabilities and higher hyperpolarisabilities ( = 8660 – 9550 × 10-30 esu) respectively.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:739249 |
| Date | January 2018 |
| Creators | Mohammed, Nabeel Shaheen |
| Publisher | University of Glasgow |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://theses.gla.ac.uk/8859/ |
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