Organobor bazlı donör-akseptör tipi konjüge polimerlerin sentezi ve optik ve elektrokimyasal özelliklerinin araştırılması

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 unit and used with a recently found method in the literature which is the post-borylation. 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), which has a boron added and became very stable with the phenyl unit, has a lower LUMO energy compared to the polymer without the boron unit (P1A) and 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.