NEW OLIGOTHIOPHENES

• Main Author: von Kieseritzky, Fredrik
• Format: Others
• Language: English
• Published: KTH, Kemi 2003
• Subjects: oligothiophenes; synthesis; light-emitting diodes; field-effect transistors; photoluminescence; quantum efficiency
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1591; http://nbn-resolving.de/urn:isbn:91-7283-497-8

This thesis deals with synthesis and characterization of newoligothiophenes and derivatives thereof, for use as organicsemiconductors in optical and electronic applications, such asfield-effect transistors and light-emitting diodes. Much workis devoted to the development of new synthetic strategies forinteresting building blocks, to beused for synthesizing suchmaterials. One series of regio-defined oligothiophenes, up tothe octamer, has been prepared and evaluated. Photoluminescencequantum efficiencies of these were 22-31 % in solution, butdropped to 2-5 % in the solid state. Another project deals withthe development of oligothiophenes with in-chain chirality.These may find use in polarized lightemitting diodes. Finally,two oligothienyl-substituted porphyrins have been synthesizedand are currently evaluated for use in light-emitting diodesand possibly in solar cells.