| 초록 |
New electron withdrawing monomers, thieno[2’,3’:5’,6’]pyrido[3,4-g]thieno[3,2-c]isoquinoline-5,11(4H,10H)-dione (TPTI) and fluorenedicyclopentathiophene dimalononitrile (CN), have been developed and used to form twelve alternating polymers having different monomer combination. It was found that LUMO energy levels of polymers are significantly determined by stronger electron accepting monomers and HOMO energy levels by the weak electron accepting monomers. In addition, fluorescent quantum yields of the TPTI-based polymers in chloroform solution are significantly decreased as the LUMO energy levels of TPTI series of polymers become deeper. The quantum yield was found to be closely related with the photovoltaic properties, which reflects the effect of internal polarization on photovoltaic properties. We provide a large set of systematic structure-property relationships, which gives new perspectives for the design of electron accepting materials. |
