Synthesis and investigation of optical and electrochemical properties of organoboron based donor-acceptor type conjugated polymers

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2021-7

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Ayyıldız, Berrin

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In recent years, the element boron has an important place in the studies of alternative energy sources to solve problems arising in the field of energy production. In addition to its superior properties and wide use in many industry areas, it is known that boron is integrated into conjugated organic structures. One of the current focus points of studies on alternative energy sources is polymers with semiconductor conjugated structures and small organic molecules. In this study, boron units were embedded in a conjugated structure that were synthesized starting from pyrazine via post-borylation strategy. It is aimed to investigate the role of intramolecular boron-nitrogen (B-N) coordination bonds on the conformation of the conjugated systems and their electronic structure. The synthesis of boron-containing polymers was carried out by Suzuki-cross coupling reaction followed by the post-borylation method. Borylated polymer (P1B), stablized by the phenyl unit, has a lower LUMO energy compared to the polymer without the boron unit (P1A) and showed a red shift of about 120 nm in emission. Photoluminescence quantum efficiency (PLQY) values are 76% for P1A at 510 nm and 58% for P1B at 630 nm. Luminance values were recorded as 12000 cd/m2 for P1A and 2000 cd/m2 for P1B. Current efficiencies of P1A and P1B were recorded as 1.3 cd/A at 9.0 V and 0.3 cd/A at 9.0 V, respectively.

Subject Keywords

Post-borylation, Photoluminescence, Conjugated polymers

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https://hdl.handle.net/11511/91652

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

B. Ayyıldız, “Synthesis and investigation of optical and electrochemical properties of organoboron based donor-acceptor type conjugated polymers,” M.S. - Master of Science, Middle East Technical University, 2021.