Vorschau

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Abstract

Polyfluorenes or copolymers based on fluorene as a building block are important materials for organic electronics and sensorics. In this work novel polymeric materials based on fluorene as a building block for organic light emitting diodes (OLED), highly efficient electron-injecting materials, polymeric sensors and for organic field-effect transistors (OFET) have been synthesized, characterized and proven. In the first part of this work (chapter 3.1), the synthesis of photochemically cleavable groups for switching the solubility of π-conjugated polymers at a certain wavelength is described. The photochemically removable groups are linked via alkyl chains to the polymer backbone. By fabrication of functional devices, it was possible to proof the concept. In the second part (chapter 3.2), the synthesis and the use of ionic functionalized polyfluorenes and polyfluorenes with polar groups as electron-injection materials in OLEDs, or as an ionic conducting and emitting material in a light-emitting electrochemical cell (LEC) are described. The synthesis and the investigation of a powerful biphasic mercury ion sensor in a microfluidic setup are reported in chapter 3.3. In the last part of this work (chapter 3.4), the synthesis and characterization of non-fluorescent polyfluorenes with exocyclic double bonds as materials for OFETs are shown.